![](media/image1.png){width="3.573611111111111in" height="3.59375in"}

**NOAA NESDIS**

**CENTER for SATELLITE APPLICATIONS and RESEARCH**

**The** **IASI** **Product Processing System**

**Interface Control Document**

**Version 2.0**

Title: IASI Product processing system interface CONTROL DOCUMENT VERSION
2.0

AUTHORS:

Larisa Koval (PSGS)

Tom King (PSGS)

APPROVAL SIGNATURES:

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_[March
19, 2008]{.underline}

Walter Wolf (STAR) Date

Project Development Lead

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_[\_\_\_\_\_March
19, 2008\_\_\_]{.underline}

> Hank Drahos (STAR) Date

Operational Products Development Branch Chief

IASI Product processing system

INTERFACE CONTROL DOCUMENT

Version History SUMMARY

  ------------- ----------------------------------------- ------------ -----------
  **Version**   **Description**                           **Revised    **Date**
                                                          Sections**   

  1.0           Created by Larisa Koval and Tom King of   New Document 08/23/07
                PSGS                                                   

  1.1           Revised after SRR                         Sections 2,  9/21/07
                                                          4, 5         

  2.0           Revised by Larisa Koval to include Level  All sections 3/19/2008
                2 products                                             
  ------------- ----------------------------------------- ------------ -----------

**TABLE OF CONTENTS**

> Page

[LIST OF TABLES 16](#list-of-tables)

[LIST OF ACRONYMS 18](#list-of-acronyms)

[1. Introduction 20](#introduction)

[2. Input Data Sets 30](#input-data-sets)

[2.1. IASI L1C Granule Files 30](#iasi-l1c-granule-files)

[2.1.1. Purpose 30](#purpose)

[2.1.2. Data File Description 31](#data-file-description)

[2.1.3. Access 33](#access)

[2.2. GFS Forecast Files 34](#gfs-forecast-files)

[2.2.1. Purpose 34](#purpose-1)

[2.2.2. Data File Description 34](#__RefHeading___Toc193253361)

[2.2.3. Access 35](#__RefHeading___Toc193253379)

[2.3. GDAS Forecast Files 36](#gdas-forecast-files)

[2.3.1. Purpose 36](#purpose-2)

[2.3.2. Data File Description 36](#data-file-description-1)

[2.3.3. Access 37](#access-1)

[2.4. CDL Template Files 38](#cdl-template-files)

[2.4.1. Purpose 38](#purpose-3)

[2.4.2. Data File Description 38](#data-file-description-2)

[2.4.3. Access 40](#access-2)

[2.5. IASI L1C Granule Metadata Template File
41](#iasi-l1c-granule-metadata-template-file)

[2.5.1. Purpose 41](#purpose-4)

[2.5.2. Data File Description 41](#data-file-description-3)

[2.5.3. Access 43](#access-3)

[2.6. Global Grid Metadata Template File
43](#global-grid-metadata-template-file)

[2.6.1. Purpose 43](#purpose-5)

[2.6.2. Data File Description 43](#data-file-description-4)

[2.6.3. Access 44](#access-4)

[2.7 L2 Metadata Template 44](#__RefHeading___Toc193253396)

[2.7.1 Purpose 44](#__RefHeading___Toc193253397)

[2.7.2 Data File Description 44](#__RefHeading___Toc193253398)

[2.7.3 Access 45](#__RefHeading___Toc193253399)

[2.8 IASI CCR Metadata Template 45](#__RefHeading___Toc193253400)

[2.8.1 Purpose 45](#__RefHeading___Toc193253401)

[2.8.2 Data File Description 45](#__RefHeading___Toc193253402)

[2.8.3 Access 46](#__RefHeading___Toc193253403)

[2.9. Matchup Template File 46](#matchup-template-file)

[2.9.1 Purpose 46](#purpose-8)

[2.9.2 Data File Description 46](#data-file-description-7)

[2.9.3 Access 47](#access-7)

[2.10. EUMETSAT Level 2 BUFR Files 47](#eumetsat-level-2-bufr-files)

[2.10.1 Purpose 47](#purpose-9)

[2.10.2 Data File Description 47](#data-file-description-8)

[2.10.3 Access 48](#access-8)

[2.11. Eigenvector Files 48](#eigenvector-files)

[2.11.1 Purpose 48](#purpose-10)

[2.11.2 Data File Description 49](#data-file-description-9)

[2.11.3 Access 49](#access-9)

[2.12 Local Angle correction File 49](#__RefHeading___Toc193253416)

[2.12.1 Purpose 49](#__RefHeading___Toc193253417)

[2.12.2 Data File Description 50](#__RefHeading___Toc193253418)

[2.12.3 Access 50](#__RefHeading___Toc193253419)

[2.13 Retrieval System Files 50](#__RefHeading___Toc193253420)

[2.13.1 Purpose 51](#__RefHeading___Toc193253421)

[2.13.2 Data File Description 51](#__RefHeading___Toc193253422)

[2.13.3 Access 53](#__RefHeading___Toc193253423)

[2.14 AMSU-A Orbital files 54](#__RefHeading___Toc193253424)

[2.14.1 Purpose 54](#__RefHeading___Toc193253425)

[2.14.2 Data File Description 54](#__RefHeading___Toc193253426)

[2.14.3 Access 55](#__RefHeading___Toc193253427)

[2.15 MHS Orbital files 55](#__RefHeading___Toc193253428)

[2.15.1 Purpose 55](#__RefHeading___Toc193253429)

[2.15.2 Data File Description 56](#__RefHeading___Toc193253430)

[2.15.3 Access 57](#__RefHeading___Toc193253431)

[3. Intermediate Data Sets 58](#intermediate-data-sets)

[3.1. IASI L1C Full Resolution Subset Files
59](#iasi-l1c-full-resolution-subset-files)

[3.1.1 Purpose 59](#purpose-15)

[3.1.2 Data File Description 60](#data-file-description-14)

[3.1.3 Access 67](#access-14)

[3.2. IASI L1CT Thinned Subset Files
68](#iasi-l1ct-thinned-subset-files)

[3.2.1 Purpose 68](#purpose-16)

[3.2.2 Data File Description 69](#data-file-description-15)

[3.2.3 Access 69](#access-15)

[3.3. IASI Daily Full Global File 70](#iasi-daily-full-global-file)

[3.3.1 Purpose 70](#purpose-17)

[3.3.2 Data File Description 70](#data-file-description-16)

[3.3.3 Access 84](#__RefHeading___Toc193253463)

[3.4. Daily Full Global Location Files
85](#daily-full-global-location-files)

[3.4.1 Purpose 85](#purpose-18)

[3.4.2 Data File Description 85](#data-file-description-17)

[3.4.3 Access 85](#__RefHeading___Toc193253467)

[3.5 AMSU-A Level 1B NetCDF Granule Files
86](#__RefHeading___Toc193253468)

[3.5.1 Purpose 86](#__RefHeading___Toc193253469)

[3.5.2 Data File Description 87](#__RefHeading___Toc193253470)

[3.5.3 Access 91](#__RefHeading___Toc193253471)

[3.6 MHS Level 1B NetCDF Granule Files 91](#__RefHeading___Toc193253472)

[3.6.1 Purpose 91](#__RefHeading___Toc193253473)

[3.6.2 Data File Description 91](#__RefHeading___Toc193253474)

[3.6.3 Access 95](#__RefHeading___Toc193253475)

[3.7 Retrieval Input/Output Files 96](#__RefHeading___Toc193253476)

[3.7.1 Purpose 96](#__RefHeading___Toc193253477)

[3.7.2 Data File Description 96](#__RefHeading___Toc193253478)

[3.7.3 Access 98](#__RefHeading___Toc193253479)

[4. Output Data Sets 99](#output-data-sets)

[4.1. IASI L1C Granule Files 100](#iasi-l1c-granule-files-1)

[4.1.1 Purpose 101](#purpose-22)

[4.1.2 Data File Description 101](#data-file-description-21)

[4.1.3 Intended Users 101](#intended-users)

[4.1.4 Access 102](#access-20)

[4.2. IASI Level 1C Granule-Level Metadata
102](#iasi-level-1c-granule-level-metadata)

[4.2.1 Purpose 102](#purpose-23)

[4.2.2 Data File Description 102](#data-file-description-22)

[4.2.3 Intended Users 104](#intended-users-1)

[4.2.4 Access 104](#access-21)

[4.3. IASI L1CT BUFR granule files 105](#iasi-l1ct-bufr-granule-files)

[4.3.1 Purpose 105](#purpose-24)

[4.3.2 Data File Description 105](#data-file-description-23)

[4.3.3 Intended Users 109](#intended-users-2)

[4.3.4 Access 109](#access-22)

[4.4. IASI Global 1-Band PC Grid Files
109](#iasi-global-1-band-pc-grid-files)

[4.4.1 Purpose 109](#purpose-25)

[4.4.2 Data File Description 110](#data-file-description-24)

[4.4.3 Intended Users 111](#intended-users-3)

[4.4.4 Access 111](#access-23)

[4.5. IASI Global 3-Band PC Grid Files
112](#iasi-global-3-band-pc-grid-files)

[4.5.1 Purpose 112](#purpose-26)

[4.5.2 Data File Description 112](#data-file-description-25)

[4.5.3 Intended Users 114](#intended-users-4)

[4.5.4 Access 114](#access-24)

[4.6. IASI Full Global 1-Band PC Grid Files
115](#iasi-full-global-1-band-pc-grid-files)

[4.6.1 Purpose 115](#purpose-27)

[4.6.2 Data File Description 115](#data-file-description-26)

[4.6.3 Intended Users 117](#intended-users-5)

[4.6.4 Access 117](#access-25)

[4.7. IASI Full Global 3-Band PC Grid Files
117](#iasi-full-global-3-band-pc-grid-files)

[4.7.1 Purpose 117](#purpose-28)

[4.7.2 Data File Description 118](#data-file-description-27)

[4.7.3 Intended Users 119](#intended-users-6)

[4.7.4 Access 119](#access-26)

[4.8. IASI Global Thinned Radiances 120](#iasi-global-thinned-radiances)

[4.8.1 Purpose 120](#purpose-29)

[4.8.2 Data File Description 120](#data-file-description-28)

[4.8.3 Intended Users 122](#intended-users-7)

[4.8.4 Access 122](#access-27)

[4.9. IASI Full Global Thinned Radiances
123](#iasi-full-global-thinned-radiances)

[4.9.1 Purpose 123](#purpose-30)

[4.9.2 Data File Description 123](#data-file-description-29)

[4.9.3 Intended Users 125](#intended-users-8)

[4.9.4 Access 125](#access-28)

[4.10. Full Global Grids Metadata 126](#full-global-grids-metadata)

[4.10.1 Purpose 126](#purpose-31)

[4.10.2 Data File description 126](#__RefHeading___Toc193253528)

[4.10.3 Intended Users 127](#intended-users-9)

[4.10.4 Access 128](#access-29)

[4.11. IASI GFS Forecast Global Grids
128](#iasi-gfs-forecast-global-grids)

[4.11.1 Purpose 128](#purpose-32)

[4.11.2 Data File Description 128](#data-file-description-31)

[4.11.3 Intended Users 130](#intended-users-10)

[4.11.4 Access 130](#access-30)

[4.12. IASI GDAS Forecast Global Grids
131](#iasi-gdas-forecast-global-grids)

[4.12.1 Purpose 131](#purpose-33)

[4.12.2 Data File Description 131](#data-file-description-32)

[4.12.3 Intended Users 133](#intended-users-11)

[4.12.4 Access 133](#access-31)

[4.13 AMSU-A Full Global Grids 134](#__RefHeading___Toc193253541)

[4.13.1 Purpose 134](#__RefHeading___Toc193253542)

[4.13.2 Data File Description 134](#__RefHeading___Toc193253543)

[4.13.3 Intended Users 136](#__RefHeading___Toc193253544)

[4.13.4 Access 136](#__RefHeading___Toc193253545)

[4.14 AMSU-A Global Grids 136](#__RefHeading___Toc193253546)

[4.14.1 Purpose 137](#__RefHeading___Toc193253547)

[4.14.2 Data File Description 137](#__RefHeading___Toc193253548)

[4.14.3 Intended Users 138](#__RefHeading___Toc193253549)

[4.14.4 Access 138](#__RefHeading___Toc193253550)

[4.15 MHS Full Global Grids 139](#__RefHeading___Toc193253551)

[4.15.1 Purpose 139](#__RefHeading___Toc193253552)

[4.15.2 Data File Description 139](#__RefHeading___Toc193253553)

[4.15.3 Intended Users 141](#__RefHeading___Toc193253554)

[4.15.4 Access 141](#__RefHeading___Toc193253555)

[4.16 MHS Global Grids 142](#__RefHeading___Toc193253556)

[4.16.1 Purpose 142](#__RefHeading___Toc193253557)

[4.16.2 Data File Description 142](#__RefHeading___Toc193253558)

[4.16.3 Intended Users 144](#__RefHeading___Toc193253559)

[4.16.4 Access 144](#__RefHeading___Toc193253560)

[4.17 IASI L2 Full Global Grids 144](#__RefHeading___Toc193253561)

[4.17.1 Purpose 144](#__RefHeading___Toc193253562)

[4.17.2 Data File Description 145](#__RefHeading___Toc193253563)

[4.17.3 Intended Users 148](#__RefHeading___Toc193253564)

[4.17.4 Access 148](#__RefHeading___Toc193253565)

[4.18 IASI L2 Global Grids 148](#__RefHeading___Toc193253566)

[4.18.1 Purpose 148](#__RefHeading___Toc193253567)

[4.18.2 Data File Description 149](#__RefHeading___Toc193253568)

[4.18.3 Intended Users 152](#__RefHeading___Toc193253569)

[4.18.4 Access 152](#__RefHeading___Toc193253570)

[4.19 IASI CCR Global Grids 152](#__RefHeading___Toc193253571)

[4.19.1 Purpose 152](#__RefHeading___Toc193253572)

[4.19.2 Data File Description 152](#__RefHeading___Toc193253573)

[4.19.3 Intended Users 154](#__RefHeading___Toc193253574)

[4.19.4 Access 154](#__RefHeading___Toc193253575)

[4.20. IASI Matchups 155](#iasi-matchups)

[4.20.1 Purpose 155](#purpose-41)

[4.20.2 Data File Description 155](#data-file-description-40)

[4.20.3 Intended Users 161](#__RefHeading___Toc193253778)

[4.20.4 Access 161](#access-39)

[4.21. EUMETSAT Level 2 BUFR Files 162](#eumetsat-level-2-bufr-files-1)

[4.21.1 Purpose 162](#__RefHeading___Toc193253781)

[4.21.2 Data File Description 162](#__RefHeading___Toc193253782)

[4.21.3 Intended Users 162](#__RefHeading___Toc193253783)

[4.21.4 Access 162](#__RefHeading___Toc193253784)

[4.22. 2-Scan Global File 163](#scan-global-file)

[4.22.1 Purpose 163](#purpose-43)

[4.22.2 Data File Description 163](#data-file-description-42)

[4.22.3 Intended Users 167](#intended-users-20)

[4.22.4 Access 167](#__RefHeading___Toc193253789)

[4.23 AMSU-A Matchups 168](#__RefHeading___Toc193253790)

[4.23.1 Purpose 168](#__RefHeading___Toc193253791)

[4.23.2 Data File Description 168](#__RefHeading___Toc193253792)

[4.23.3 Intended Users 172](#__RefHeading___Toc193253793)

[4.23.4 Access 172](#__RefHeading___Toc193253794)

[4.24 MHS Matchups 173](#__RefHeading___Toc193253795)

[4.24.1 Purpose 173](#__RefHeading___Toc193253796)

[4.24.2 Data File Description 173](#__RefHeading___Toc193253797)

[4.24.3 Intended Users 177](#__RefHeading___Toc193253798)

[4.24.4 Access 177](#__RefHeading___Toc193253799)

[4.25 IASI L2 Matchups 178](#__RefHeading___Toc193253800)

[4.25.1 Purpose 178](#__RefHeading___Toc193253801)

[4.25.2 Data File Description 178](#__RefHeading___Toc193253802)

[4.25.3 Intended Users 184](#__RefHeading___Toc193253803)

[4.25.4 Access 184](#__RefHeading___Toc193253804)

[4.26 IASI L2 NetCDF Files 184](#__RefHeading___Toc193253805)

[4.26.1 Purpose 184](#__RefHeading___Toc193253806)

[4.26.2 Data File Description 184](#__RefHeading___Toc193253807)

[4.26.3 Intended Users 197](#__RefHeading___Toc193253808)

[4.26.4 Access 197](#__RefHeading___Toc193253809)

[4.27 IASI CCR NetCDF File 198](#__RefHeading___Toc193253810)

[4.27.1 Purpose 198](#__RefHeading___Toc193253811)

[4.27.2 Data File Description 198](#__RefHeading___Toc193253812)

[4.27.3 Intended Users 207](#__RefHeading___Toc193253813)

[4.27.4 Access 207](#__RefHeading___Toc193253814)

[4.28 IASI L2 and CCR Metadata 208](#__RefHeading___Toc193253815)

[4.28.1 Purpose 208](#__RefHeading___Toc193253816)

[4.28.2 Data File Discription 208](#__RefHeading___Toc193253817)

[4.28.3 Intended Users 209](#__RefHeading___Toc193253818)

[4.28.4 Access 209](#__RefHeading___Toc193253819)

[4.29 IASI CCR BUFR Files 210](#__RefHeading___Toc193253820)

[4.29.1 Purpose 210](#__RefHeading___Toc193253821)

[4.29.2 Data File Description 210](#__RefHeading___Toc193253822)

[4.29.3 Intended Users 211](#__RefHeading___Toc193253823)

[4.29.4 Access 211](#__RefHeading___Toc193253824)

[4.30 IASI NetCDF Principal Component File
212](#__RefHeading___Toc193253825)

[4.30.1 Purpose 212](#__RefHeading___Toc193253826)

[4.30.2 Data File Description 212](#__RefHeading___Toc193253827)

[4.30.3 Intended Users 220](#__RefHeading___Toc193253828)

[4.30.4 Access 220](#__RefHeading___Toc193253829)

[5. LIST OF REFERENCES 223](#list-of-references)

[Appendix A - IASI L1C BUFR Table
225](#appendix-a---iasi-l1c-bufr-table)

**LIST OF FIGURES**

> Page

[**Figure 1. IASI PPS External Interfaces
22**](#__RefHeading___Toc191872488)

[Figure 2. IASI PPS System Flow 23](#__RefHeading___Toc191872489)

[Figure 3. Check L1C Unit Flow 24](#__RefHeading___Toc191872490)

[Figure 4. L1C Subsetter Unit Flow 24](#__RefHeading___Toc191872491)

[Figure 5. IASI L1B Processing Unit Flow
25](#__RefHeading___Toc191872492)

[Figure 6. IASI L2 Processing Unit Flow
25](#__RefHeading___Toc191872493)

[Figure 7. Global Grids Unit Flow (Level 1)
26](#__RefHeading___Toc191872494)

[Figure 8. Global Grids Unit Flow (Level 2)
27](#__RefHeading___Toc191872495)

[Figure 9. Global Binaries Unit Flow 28](#__RefHeading___Toc191872496)

[Figure 10. Global Matchups Unit Flow 29](#__RefHeading___Toc191872497)

# LIST OF TABLES {#list-of-tables .unnumbered}

> Page

[Table 1. IASI L1C Data File-Naming Convention and Format.
31](#__RefHeading___Toc193253832)

[Table 2 CDL Template File Descriptions
38](#__RefHeading___Toc193253833)

[Table 3. Retrieval System Files 51](#__RefHeading___Toc193253834)

[Table 4 . Intermediate Data Sets 58](#__RefHeading___Toc193253835)

[Table 5 Full resolution NetCDF header 60](#__RefHeading___Toc193253836)

[Table 6. Thinned NetCDF File Header 69](#__RefHeading___Toc193253837)

[Table 7 IASI Global Binariy Header Record Number 1
71](#__RefHeading___Toc193253838)

[Table 8 IASI Global Binary Header Record Number 2
72](#__RefHeading___Toc193253839)

[Table 9 IASI Global Binary Data Record
72](#__RefHeading___Toc193253840)

[Table 10 AMSU-A Global Binary Header Record Number 1
75](#__RefHeading___Toc193253841)

[Table 11 AMSU-A Global Binary Header Record Number 2
75](#__RefHeading___Toc193253842)

[Table 12 AMSU-A Global Binary Data Record
75](#__RefHeading___Toc193253843)

[Table 13 MHS Global Binary Header Record Number 1
77](#__RefHeading___Toc193253844)

[Table 14 MHS Global Binary Header Record Number 2
78](#__RefHeading___Toc193253845)

[Table 15 MHS Global Binary Data Record
78](#__RefHeading___Toc193253846)

[Table 16 IASI L2 Global Binary Header Record Number 1
80](#__RefHeading___Toc193253847)

[Table 17 IASI L2 Global Binary Data Record
80](#__RefHeading___Toc193253848)

[Table 18 AMSU-A Level 1B Net CDF File Header
87](#__RefHeading___Toc193253849)

[Table 19 MHS Level 1B NetCDF File Header
92](#__RefHeading___Toc193253850)

[Table 20. Output Files 99](#__RefHeading___Toc193253851)

[Table 21. Metadata File Name Convention and Format
103](#__RefHeading___Toc193253852)

[Table 22. IASI L1CT Granule Files Subset
105](#__RefHeading___Toc193253853)

[Table 23. IASI L1C BUFR Granule File Name Structure
106](#__RefHeading___Toc193253854)

[Table 24. Matchup Header Record Number 1
156](#__RefHeading___Toc193253855)

[Table 25. Matchup Header Record Number
157](#__RefHeading___Toc193253856)

[Table 26. Matchup Data Record 157](#__RefHeading___Toc193253857)

[Table 27. 2-Scan Header Record Number 1
164](#__RefHeading___Toc193253858)

[Table 28. 2-Scan Header Record Number 2
165](#__RefHeading___Toc193253859)

[Table 29. 2-Scan Data Record 165](#__RefHeading___Toc193253860)

[Table 30. AMSU-A Matchup Header Record Number 1
169](#__RefHeading___Toc193253861)

[Table 31. AMSU-A Matchup Header record Number 2
169](#__RefHeading___Toc193253862)

[Table 32. AMSU-A Matchup Data record 169](#__RefHeading___Toc193253863)

[Table 33. MHS Matchup Header Record Number 1
174](#__RefHeading___Toc193253864)

[Table 34. MHS Matchup Header Record Number 2
174](#__RefHeading___Toc193253865)

[Table 35. MHS Matchup Data Record 174](#__RefHeading___Toc193253866)

[Table 36. IASI L2 matchup Header Record Number 1
178](#__RefHeading___Toc193253867)

[Table 37. IASI L2 Matchup Data record
179](#__RefHeading___Toc193253868)

[Table 38. IASI L2 NetCDF Header 186](#__RefHeading___Toc193253869)

[Table 39. IASI CCR NetCDF Header 200](#__RefHeading___Toc193253870)

[Table 40. IASI NetCDF Principal Component File Header
213](#__RefHeading___Toc193253871)

# LIST OF ACRONYMS {#list-of-acronyms .unnumbered}

  ------------ ----------------------------------------------------------
  AFWA         Air Force Weather Agency

  AMSU         Advanced Microwave Sounder Unit

  ASCII        American Standard Code for Information Interchange

  AVHRR        Advanced Very High Resolution Radiometer

  BUFR         Binary Universal Form for the Representation of
               meteorological data

  CCR          Cloud-Cleared Radiances

  CDL          Common Data Language

  CLASS        Comprehensive Large Array-data Stewardship System

  DDS          Data Distribution Server

  DOD          Department of Defense

  EPS          EUMETSAT Polar System

  ESPC         Environmental Satellite Processing Center

  EUMETSAT     European Organization for the Exploitation Meteorological
               Satellites

  FGDC         Federal Geographic Data Center

  FNMOC        Fleet Numerical Meteorology and Oceanography Center

  FOR          Field Of Regard

  FOV          Field of View

  GDAS         Global Data Assimilation System

  GFS          Global Forecast System

  GFT          Generic File Transfer

  GMAO         Global Modeling and Assimilation Office

  GrADS        Grid Analysis and Display System

  GRIB         Gridded Binary format

  GTS          Global Transmission System

  IASI         Infrared Atmospheric Sounding Interferometer

  MHS          Microwave Humidity Sounder

  NCEP         National Center for Environmental Prediction

  NetCDF       Network Common Data Format

  NESDIS       National Environmental Satellite, Data, and Information
               Service

  NOAA         National Oceanic and Atmospheric Administration

  NRL          Naval Research Lab

  NRT          Near Realtime Terminal

  NWS          National Weather Service

  OPDB         Operations Product Development Branch

  OSDPD        Office of Satellite Data Processing and Distribution

  PFS          Product Format Specification

  PPS          Product Processing System

  RR           Reconstructed Radiances

  RSE          Remote Sensing Extension

  SDD          System Description Document

  STAR         Center for Satellite Applications and Research

  XML          eXtensible Markup Language
  ------------ ----------------------------------------------------------

# Introduction

The Interface Control Document (ICD), a standard STAR EPL project
artifact, is one of six standard SPSRB documents. The purpose of this
document is to describe all input, intermediate and output datasets at
the level of detail sufficient for the maintenance personnel to be able
to locate it and identify processing errors that involve it. This
document specifies the interfaces of the IASI product processing system
(PPS). This document provides an overview of the IASI PPS, followed by
detailed descriptions of input, intermediate, and output datasets. Data
description includes details on format/type, range and special error
value, file naming conventions and data content and formats. For more
detailed descriptions of the IASI PPS the reader is referred to the
User's Manual (UM) and System Description Document (SDD). Intended users
of this document are operational maintenance personnel.

There are seven main system software units within the IASI product
processing system. Each unit is not a single program, but actually a
family of related programs. They are numbered roughly in the order in
which they process data through the system: (1) Check L1C, (2) L1B
Processing Unit, (3) L1C Subsetter, (4) L2 Processing, (5) Global Grids,
(6) Global Binaries, and (7) Global Matchups. Check L1C is the data
acquisition, checking, and preprocessing units. L1C Subsetter is the
main product generation unit. L1B Processing handles ingest, collocation
to IASI, and preprocessing (for Level 2) of the AMSU-A and MHS data.
Global Grids, Global Binaries, and Global Matchups are the products
validation and verification units. Data flows within units are shown in
Figures 2 - 10.

This document was developed by the IASI development team under the
oversight of the IASI project lead and the IASI project review team. The
review team consists of management and technical staff from both the
Center for Satellite Applications and Research (STAR) and the Office of
Satellite Data Processing and Distribution (OSDPD). The document is
approved by members of this review team. It is stored in configuration
management as a project artifact, maintained, and disseminated by the
IASI development team. This team resides within the Operational Products
Development Branch (OPDB) at STAR.

This document is organized as follows:

Section 1 -- provides brief description of IASI PPS.

It also gives the overview of the document.

Section 2 -- provides a description of input data files, including
function, type, format and naming convention and content.

Section 3 -- provides a description of intermediate files including
function, type, format and naming convention and content. It also gives
an idea by which component of the PPS these datasets are generated and
what they are used for. The software units are always shown in italics.

Section 4-- provides a description of output data files including
function, type, format and naming convention and content. It also gives
an idea by which component of the PPS these datasets are generated and
what they are used for. The software units are always shown in italics.

Section 5 - provides a list of documents that are referenced in this
manual. Many of these are project artifacts that should be available to
the users of this document.

![](media/image3.wmf){width="5.997916666666667in"
height="3.6118055555555557in"}

Figure 1. IASI PPS External Interfaces

Figure 1 shows the external system interfaces. The external interfaces
refer to the connectivity between the processing system and outside
elements such as remote servers. The current system has three external
interfaces, the Generic File Transfer (GFT), the Environmental Satellite
Processing Center (ESPC) Data Distribution Server (DDS), and the OSDPD
24/7 production monitoring machine (*balmy.nesdis.noaa.gov*). The
EUMETSAT IASI L1C granule data are pulled from the GFT and the GFS and
GDAS forecast files, as well as AMSU-A/MHS L1B data files are pulled
from the DDS. All product files are transferred to the DDS where
customers can retrieve them. The DDS makes products available to the
Shared Processing Network (SPN) for Department of Defense (DOD)
customers. The IASI *Process_Status* file is required by the OSDPD
monitoring tool. Updates of this file's contents are sent directly to
*balmy.nesdis.noaa.gov* at regular intervals. The OSDPD monitoring tool
is run on this machine by the 24/7 production monitoring staff. All
system files reside within, and are managed by, the system itself.
Access to the GFT and DDS is through ftp. This is automated using a
.netrc file in the home directory of the application ID
(/home/iasidev/.netrc). The IASI L1C data files reside in the GFT
directory of entry (when accessing the machine through the user
account). On the DDS all files required as input are pulled from the
"pull" directory. The IASI PPS products are sent to the "push"
directory. Upon entry a user or script must change to the "push" or
"pull" directories. Sent files can be viewed in the neighboring "pull"
directory to verify transfer. Nominally, data reside on the GFT and DDS
for 24 hours before being removed. The DDS handles all the direct
external data distribution to customers. To access the data products on
these servers, a customer must have an account. Retrievals of all data
products are through ftp pulls.

![](media/image5.wmf){width="5.995833333333334in"
height="3.154166666666667in"}

Figure 2. IASI PPS System Flow

Figure 2 shows the internal system interfaces. The internal interfaces
refer to the relationships (1) between processing units and (2) between
processing units and the system itself. Each unit is not a single
program, but actually a family of related programs.

![](media/image6.wmf){width="5.9944444444444445in" height="2.975in"}

Figure 3. Check L1C Unit Flow

![](media/image7.wmf){width="5.997916666666667in"
height="2.8715277777777777in"}

Figure 4. L1C Subsetter Unit Flow

![](media/image8.wmf){width="5.991666666666666in"
height="2.691666666666667in"}

Figure 5. IASI L1B Processing Unit Flow

![](media/image9.wmf){width="5.992361111111111in"
height="3.3201388888888888in"}

Figure 6. IASI L2 Processing Unit Flow

![](media/image12.wmf){width="5.996527777777778in"
height="3.0319444444444446in"}

Figure 7. Global Grids Unit Flow (Level 1)

![](media/image14.wmf){width="5.991666666666666in"
height="3.2263888888888888in"}

Figure 8. Global Grids Unit Flow (Level 2)

![](media/image15.wmf){width="5.991666666666666in"
height="3.4604166666666667in"}

Figure 9. Global Binaries Unit Flow

![](media/image17.wmf){width="5.991666666666666in"
height="3.282638888888889in"}

Figure 10. Global Matchups Unit Flow

# Input Data Sets

Input datasets used in IASI PPS are described in detail in this section.
To get a sense of where these files fit within the IASI PPS, the reader
is referred to the previous section and Figures 1 - 10.

## IASI L1C Granule Files

The EUMETSAT PFC IASI L1C binary granule files.

### Purpose

The EUMETSAT IASI L1C binary granule files in the native Product Format
Specification (PFS) format are used for:

-   Ingesting and staging the EUMETSAT IASI L1C data for processing.

    -   Extracting the contents of the EUMETSAT IASI L1C header for
        generating metadata.

    -   Extracting some additional metadata information from the IASI
        measurement data records such as bounding box for the
        granule.*)*

```{=html}
<!-- -->
```
-   Generating spatially and spectrally subset data as well as principal
    components

-   Generating FGDC compliant IASI granule metadata files inthe
    eXtensible Markup Language (XML) format for the Comprehensive Large
    Array-data Stewardship System (CLASS) archive in accordance with
    Producer-Archive Submission Agreement for IASI Products (CLASS,
    2006). These granule files are also used to generate subset data
    products to be distributed for operational use by the NWS and the
    Department of Defense (DOD).

These files and their associated metadata are transmitted by the
NOAA/NESDIS/STAR near real time processing system to the OSDPD DDS for
retrieval by CLASS.

### Data File Description

These are big endian sequential access binary files. The data set
consists of granular files 176 seconds in length. Therefore, 480
granules are produced per day. The IASI level 1C PFS files contain:

-   The radiances for 8461 channels

-   The mean and standard deviation of Advanced Very High Resolution
    Radiometer (AVHRR) radiances on the IASI fields of view

-   Calibrated IASI image for a window channel

-   An AVHRR radiance analysis image

-   All associated navigational and temporal information for the
    observations

-   Number of quality control flags.

[]{#__RefHeading___Toc193253832 .anchor}**Table 1. IASI L1C Data
File-Naming Convention and Format.**

+----------+-----------------------------------------------------------+
| Data     | IASI_x                                                    |
| fil      | xx_1C_M01\_\${Sensing_Start}Z\_\${Sensing_End}Z\_\${P}\_\ |
| e-naming | ${D}\_\${Processing_Time_Start}Z\_\${Unknown_Date_String} |
| Co       |                                                           |
| nvention | Where:                                                    |
|          |                                                           |
|          | IASI = Instrument                                         |
|          |                                                           |
|          | xxx = hard-coded value                                    |
|          |                                                           |
|          | 1C = Processing level                                     |
|          |                                                           |
|          | M01 = Satellite (MetOp1)                                  |
|          |                                                           |
|          | Sensing_Start = the starting time of observations given   |
|          | in the following                                          |
|          |                                                           |
|          | format YYYYMODDHHMMSSZ                                    |
|          |                                                           |
|          | Sensing_End = the ending time of observations given as    |
|          |                                                           |
|          | YYYYMODDHHMMSSZ                                           |
|          |                                                           |
|          | \$P = Processing mode                                     |
|          |                                                           |
|          | \$D = Disposition mode                                    |
|          |                                                           |
|          | Processing_Time_Start = the processing time for the       |
|          | observations given as YYYYMODDHHMMSSZ                     |
|          |                                                           |
|          | \$Unknown_Date_String = this is some time string whose    |
|          | meaning is not known because it is not defined by the EPS |
|          | Programme Generic Product Format Specification (EUMETSAT, |
|          | 2003)                                                     |
|          |                                                           |
|          | The string "YYYYMODDHHMMSSZ" is a date string containing  |
|          | the following components of time:                         |
|          |                                                           |
|          | YYYY = 4 digit year (e.g. 2005)                           |
|          |                                                           |
|          | MO = 2 digit month (01-12)                                |
|          |                                                           |
|          | DD = day of month (01-31)                                 |
|          |                                                           |
|          | HH = hour (00-23)                                         |
|          |                                                           |
|          | MM = minute (00-59)                                       |
|          |                                                           |
|          | SS = seconds (00-59)                                      |
|          |                                                           |
|          | Z = Greenwich Mean Time                                   |
|          |                                                           |
|          | The variable \$P can have any of the following values:    |
|          |                                                           |
|          | N = nominal                                               |
|          |                                                           |
|          | B = backlog                                               |
|          |                                                           |
|          | R = reprocessing                                          |
|          |                                                           |
|          | V = validation                                            |
|          |                                                           |
|          | At this time NOAA/NESDIS/STAR plans to distribute only    |
|          | nominal mode data to the ESPC DDS.                        |
|          |                                                           |
|          | The variable \$D may have any of the following values:    |
|          |                                                           |
|          | T = testing                                               |
|          |                                                           |
|          | O = operational                                           |
|          |                                                           |
|          | C = commissioning                                         |
+----------+-----------------------------------------------------------+
| Data     | The file is a binary (big endian) data file in sequential |
| file     | access format. An IASI L1C data file contains 22          |
| formats  | measurement data records each of which has a nominal      |
|          | record length of 2727768 bytes. If a measurement data     |
|          | record is missing, a 21 byte dummy measurement data       |
|          | record is inserted where the full record would normally   |
|          | be. The absence of a given record is indicated in the     |
|          | generic record header of the dummy measurement data       |
|          | record. There are 4 types of records that precede the     |
|          | measurement data records: (1) the Main Product Header     |
|          | Record (3307 bytes); (2) three Internal Pointer Records   |
|          | (3 X 27 bytes); (3) the Global Internal Auxiliary Data    |
|          | Record-Quality (228346 bytes); and (4) the Global         |
|          | Internal Auxiliary Data Record-Scale Factors (84 bytes).  |
|          | Therefore, with the headers and the 22 data records a     |
|          | file, with no missing records, is exactly 60242714        |
|          |                                                           |
|          | bytes in length.                                          |
+----------+-----------------------------------------------------------+
| Expected | 60 MB/file                                                |
| data     |                                                           |
| file     |                                                           |
| size     |                                                           |
+----------+-----------------------------------------------------------+

  ----------- -----------------------------------------------------------
              

              

              
  ----------- -----------------------------------------------------------

There are no backup sources of these input data sets.

Specific file details (and more about data and header records) can be
found in:

EPS PROGRAMME IASI Level 1 Product Format Specifications, Ref:
EUM.EPS.SYS.SPE.990003,Issue 6, Rev 6, WEB number 270000, 03/23/2004,
EUMETSAT.\
For the EUMETSAT L1C PFS format refer to the section \"GIADR-QUALITY\",
\"GIADR-SCALE FACTORS\", and \"MDR-1C\" in the Appendix
\"IASI-L1-PFS-6.6-ANNEX\" in the document "EPS PROGRAMME IASI Level 1
Product Format Specifications, Ref: EUM.EPS.SYS.SPE.990003,Issue 6, Rev
6, WEB number 270000, 03/23/2004, EUMETSAT".

EPS Programme Generic Product Format Specification, Ref:
EPS.GGS.SPE.96167, Issue 6, Rev 4, WEB number 270000, 02/11/2003,
EUMETSAT.

### Access

The IASI data originate from the EPS MetOp1 satellite and are processed
from Level 0 up to Level 2 at the processing facilities in Darmstadt,
Germany by European Organization of the Exploration of Meteorological
Satellites (EUMETSAT). These data files are then pushed into remote
server (GFT) (maco.nesdis.noaa.gov). The files are pulled into the
system by the Perl script called *Run_Get_L1C-Files.pl.* Normally, the
files arrive in the system approximately every three minutes at:

*\$BASE/L1C/IASI*

POC - Simon Elliott

Meteorological Product Implementation Manager, Operations department

Address: Am Kavalleriesand 31

Darmstadt, Hessen, 64295

Germany

Telephone: (+49) 6151 807 385

Fax: (+49) 6151 807 385

E-Mail Address: <Simon.Elliott@eumetsat.int>

(Reference to the Agreement between EUMETSAT and NOAA concerning IASI
data will be inserted here)

## GFS Forecast Files

Global Forecast System (GFS) forecast files

### Purpose

These files are used to generate the GFS forecast global grids by the
script *Run_IASI_GFS_Forecast_Grids.pl*. This script is part of the
Global Grids software unit.

1.  []{#__RefHeading___Toc193253361 .anchor}Data File Description

The files have the following name structure:

*gfs.t\${Hour}z.pgrbf\${Forecast}*

where:

*\${Hour}* = the time for which the forecast is run (00Z, 06Z, 12Z, and
18Z)

*\${Forecast}* = the forecast projection time (in hours = 00, 03, 06,
09, and 12)

00, 03, 06, 09, and 12 hour forecasts are run every six hours. The files
are GRIB format files and are read with the *wgrib* reader which is
freely available from NCEP. The header content of any GRIB file can be
viewed by running *wgrib* and supplying the file name as an argument to
the command.

The following forecast variables are extracted from 91 levels and used
by the processing:

Run Hour

Forecast Hour

Forecast Latitude

Forecast Longitude

Pressure

Temperature

Water Vapor

Ozone

2 meter Dew Point

2 meter Temperature

Skin Temperature

Surface Pressure

Precipitable Water Content

Total Column Ozone

Sea Surface Temperature

Land Fraction

Temperature of the 30 mb to 0 mb layer

The surface pressure from these files is also used in the Level 2
Processing unit. This will be discussed in a later release of the
system.

2.  []{#__RefHeading___Toc193253379 .anchor}Access

These are forecast files generated by NCEP and pushed (by NCEP) to the
ESPC/DDS. They are then pulled by the IASI system script and put in the
following directory:

*\$BASE/Model_Forecast/AVIATION/\${Year}/\${Month}/\${Day*}

where:

\${Year} = the 4-digit year

\${Month} = 2-digit month

\${Day} = 2-digit day of month

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## GDAS Forecast Files

Global Data Assimilation System (GDAS) forecast files

### Purpose

These files are used to generate the GDAS forecast global grids by the
script *Run_IASI_GDAS_Forecast_Grids.pl*. This script is part of the
Global Grids software unit.

### Data File Description

The input forecast files must be in GRIB format and are from the GDAS
forecast products. The GDAS GRIB forecast files have the following name
structure:

*gdas1.t\${Hour}z.sf\${Forecast}*

where:

*\${Hour}* = the time for which the forecast is run (00Z, 06Z, 12Z, and
18Z).

*\${Forecast}* = the forecast projection time (in hours = 00, 03, 06,
and 09).

00, 03, 06, and 09 hour forecasts are run every six hours. These files,
unlike the GFS files, are in a special binary format that cannot be
viewed easily. The data are also in spectral coordinates, as opposed to
rectangular coordinates.

The following forecast variables are extracted from 91 levels and used
by the processing:

Run Hour

Forecast Hour

Forecast Latitude

Forecast Longitude

Pressure

Temperature

Water Vapor

Ozone

2 meter Dew Point

2 meter Temperature

Skin Temperature

Surface Pressure

Precipitable Water Content

Total Column Ozone

Sea Surface Temperature

Land Fraction

Delta Pressure

### Access

These are forecast files generated by NCEP and pushed (by NCEP) to the
ESPC/DDS. They are then pulled by the IASI system script
(*Run_Get_GDAS_Forecast.pl*) and put in the following directory:

*\$BASE/Model_Forecast/GDAS/\${Year}/\${Month}/\${Day*}

where:

\${Year} = the 4-digit year

\${Month} = 2-digit month

\${Day} = 2-digit day of month

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy,Nichols@noaa.gov

## CDL Template Files

Common Data Language (CDL) Template files

The system uses a number of template files. These are all static files
that will only change with a new delivery of the system. They are never
modified by the scripts and programs that use them. Scripts will only
copy these files to a local directory or create a soft links to them.

### Purpose

These are template parameter files used for generating the IASI L1C,
AMSU-A, MHS, and IASI L2 granule subsets.

### Data File Description

These files contain the lists of channels and footprints to be extracted
for each type of subset. They also contain the variable lists, array
sizes and array dimensions for each NetCDF output file. Each file can be
converted into a NetCDF file using the *ncgen* NetCDF library utility.
This file will have a complete header based on that of the CDL template,
but contains no instrument data values, only fill (missing) values.
These files are then populated with instrument data values by the
subsetter code. There is a different template file for each type of
subset. In addition, for each subset, there is a template for a granule
that contains 22 or 23 scan lines.

The following CDL template files, shown in table 2, are present in the
current build:

[]{#__RefHeading___Toc193253833 .anchor}Table 2 CDL Template File
Descriptions

  ----------------------------------- -----------------------------------
  CDL Template Name                   Description

  *iasi_2scan_22.cdl*                 A template for all fovs, 8461
                                      channels, 2 scans/granule (22
                                      scans)

  *iasi_2scan_23.cdl*                 A template for all fovs, 8461
                                      channels, 2 scans/granule (23
                                      scans)

  *iasi_all_22.cdl*                   A template for all fovs, 8461
                                      channels (22 scans)

  *iasi_all_23.cdl*                   A template for all fovs, 8461
                                      channels (23 scans)

  *iasi_all_pc_1b_22.cdl*             template for all fovs, 616 channels
                                      of RR, 1 band (22 scans)

  *iasi_all_pc_1b_23.cdl*             A template for all fovs, 616
                                      channels of RR, 1 band (23 scans)

  *iasi_all_pc_3b_22.cdl*             A template for all fovs, 616
                                      channels of RR, 3 band (22 scans)

  *iasi_all_pc_3b_23.cdl*             A template for all fovs, 616
                                      channels of RR, 3 band (23 scans)

  *iasi_gmao_22.cdl*                  A template for all fovs, 616
                                      channels (22 scans)

  *iasi_gmao_23.cdl*                  A template for all fovs, 616
                                      channels (23 scans)

  *iasi_ncep_22.cdl*                  A template for all 1^st^ fov, 616
                                      channels (22 scans)

  *iasi_ncep_23.cdl*                  A template for all 1^st^ fov, 616
                                      channels (23 scans)

  *iasi_ncep_pc_1b_22.cdl*            A template for 1^st^ fov, 616
                                      channels of RR, 1 band (22 scans)

  *iasi_ncep_pc_1b_23.cdl*            A template for 1^st^ fov, 616
                                      channels of RR, 1 band (23 scans)

  *iasi_ncep_pc_3b_22.cdl*            A template for 1^st^ fov, 616
                                      channels of RR, 3 band (22 scans)

  *iasi_ncep_pc_3b_23.cdl*            A template for 1^st^ fov, 616
                                      channels of RR, 3 band (23 scans)

  *iasi_warmest_22.cdl*               A template for all warmest fov, 616
                                      channels (22 scans)

  *iasi_warmest_23.cdl*               A template for all warmest fov, 616
                                      channels (23 scans)

  *amsua_22.cdl*                      A template for all fovs and all
                                      channels (22 scans)

  *amsua_23.cdl*                      A template for all fovs and all
                                      channels (23 scans)

  *mhs_22.cdl*                        A template for all fovs and all
                                      channels (22 scans)

  *mhs_23.cdl*                        A template for all fovs and all
                                      channels (23 scans)

  *iasi_ccr_22.cdl*                   A template for all fovs and all
                                      8461 channels (22 scans)

  *iasi_ccr_23.cdl*                   A template for all fovs and all
                                      8461 channels (23 scans)

  *iasi_ccr_archive_22.cdl*           A template for all fovs and all
                                      8461 channels (22 scans). Unused
                                      variable names are deleted and
                                      current ones are standardized for
                                      archive.

  *iasi_ccr_archive_23.cdl*           A template for all fovs and all
                                      8461 channels (23 scans). Unused
                                      variable names are deleted and
                                      current ones are standardized for
                                      archive.

  *iasi_ccr_ncep_22.cdl*              A template for all fovs and 616
                                      channels (22 scans)

  *iasi_ccr_ncep_23.cdl*              A template for all fovs and 616
                                      channels (23 scans)

  *iasi_l2_22.cdl*                    A template for all fovs for level 2
                                      profile data (22 scans)

  *iasi_l2_23.cdl*                    A template for all fovs for level 2
                                      profile data (23 scans)

  All files contain radiances unless  
  otherwise indicated with an RR      
  which stands for Reconstructed      
  Radiances from principal            
  components.                         
  ----------------------------------- -----------------------------------

### Access

All CDL templates are provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

All CDL templates are located in the system file tree at:

*\$BASE/OPERATIONS/NRT_OPS/CDLFILES/*

## IASI L1C Granule Metadata Template File

### Purpose

To generate FGDC compliant IASI archival granule metadata for CLASS.

### Data File Description

This is an FGDC-RSE compliant xml format metadata template file. It is a
static file that is used to build the IASI granule metadata files. It
contains static metadata and some tags that are extracted and replaced
with dynamic information by the IASI granule metadata generation script
(*Create_IASI_L1C_Metadata.pl*). Below is an example of a Granule_Info
file for Granule number 088 from June 8th, 2007:

  -----------------------------------------------------------------------------------------------------
  YEAR=2007\
  MONTH=06\
  DAY=08\
  GRANULE_NUMBER=088\
  L1C_FILENAME=IASI_xxx_1C_M02_20070608042357Z_20070608042653Z_N_O_20070608060013Z\_\_20070608060557\
  PRODUCT_NAME                  = IASI_xxx_1C_M02_20070608042357Z_20070608042653Z_N_O_20070608060013Z\
  PARENT_PRODUCT_NAME_1         = IASI_xxx_00_M02_20070608042352Z_20070608042700Z_N_O_20070608055040Z\
  PARENT_PRODUCT_NAME_2         = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\
  PARENT_PRODUCT_NAME_3         = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\
  PARENT_PRODUCT_NAME_4         = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\
  INSTRUMENT_ID                 = IASI\
  INSTRUMENT_MODEL              =   1\
  PRODUCT_TYPE                  = xxx\
  PROCESSING_LEVEL              = 1C\
  SPACECRAFT_ID                 = M02\
  SENSING_START                 = 20070608042357Z\
  SENSING_END                   = 20070608042653Z\
  SENSING_START_THEORETICAL     = 20070608032100Z\
  SENSING_END_THEORETICAL       = 20070608050300Z\
  PROCESSING_CENTRE             = CGS1\
  PROCESSOR_MAJOR_VERSION       =     3\
  PROCESSOR_MINOR_VERSION       =     6\
  FORMAT_MAJOR_VERSION          =    10\
  FORMAT_MINOR_VERSION          =     0\
  PROCESSING_TIME_START         = 20070608060013Z\
  PROCESSING_TIME_END           = 20070608060208Z\
  PROCESSING_MODE               = N\
  DISPOSITION_MODE              = O\
  RECEIVING_GROUND_STATION      = SVL\
  RECEIVE_TIME_START            = 20070608045844Z\
  RECEIVE_TIME_END              = 20070608045853Z\
  ORBIT_START                   =  3288\
  ORBIT_END                     =  3289\
  ACTUAL_PRODUCT_SIZE           =    60242714\
  STATE_VECTOR_TIME             = 20070608024935000Z\
  SEMI_MAJOR_AXIS               =  7204595893\
  ECCENTRICITY                  =        1232\
  INCLINATION                   =       98697\
  PERIGEE_ARGUMENT              =       70399\
  RIGHT_ASCENSION               =      218902\
  MEAN_ANOMALY                  =      289679\
  X_POSITION                    =  1299767989\
  Y_POSITION                    = -7083348469\
  Z_POSITION                    =    -6891965\
  X_VELOCITY                    =    -1623494\
  Y_VELOCITY                    =     -296280\
  Z_VELOCITY                    =     7355656\
  EARTH_SUN_DISTANCE_RATIO      =           6\
  LOCATION_TOLERANCE_RADIAL     =           0\
  LOCATION_TOLERANCE_CROSSTRACK =           0\
  LOCATION_TOLERANCE_ALONGTRACK =           0\
  YAW_ERROR                     =           0\
  ROLL_ERROR                    =           0\
  PITCH_ERROR                   =           0\
  SUBSAT_LATITUDE_START         =           0\
  SUBSAT_LONGITUDE_START        =           0\
  SUBSAT_LATITUDE_END           =      -14801\
  SUBSAT_LONGITUDE_END          =     -101599\
  LEAP_SECOND                   =  0\
  LEAP_SECOND_UTC               = xxxxxxxxxxxxxxZ\
  TOTAL_RECORDS                 =     28\
  TOTAL_MPHR                    =      1\
  TOTAL_SPHR                    =      0\
  TOTAL_IPR                     =      3\
  TOTAL_GEADR                   =      0\
  TOTAL_GIADR                   =      2\
  TOTAL_VEADR                   =      0\
  TOTAL_VIADR                   =      0\
  TOTAL_MDR                     =     22\
  COUNT_DEGRADED_INST_MDR       =     12\
  COUNT_DEGRADED_PROC_MDR       =     12\
  COUNT_DEGRADED_INST_MDR_BLOCKS=      0\
  COUNT_DEGRADED_PROC_MDR_BLOCKS=      0\
  DURATION_OF_PRODUCT           =   175562\
  MILLISECONDS_OF_DATA_PRESENT  =   175562\
  MILLISECONDS_OF_DATA_MISSING  =        0\
  SUBSETTED_PRODUCT             = 0\
  BOUNDING_LAT1=-26.31\
  BOUNDING_LAT2=-21.67\
  BOUNDING_LAT3=-16.84\
  BOUNDING_LAT4=-12.15\
  BOUNDING_LON1=-107.68\
  BOUNDING_LON2=-89.38\
  BOUNDING_LON3=-111.20\
  BOUNDING_LON4=-92.79\
  AD_STAT=AA\
  GRANULE_STATUS=M\
  DUMP_START_TIME=20070608032100\
  DUMP_END_TIME=20070608050300

  -----------------------------------------------------------------------------------------------------

### Access

The IASI granule metadata template file is provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

The file is in the system file tree at:

*\$BASE/OPERATIONS/NRT_OPS/metadata/IASI_Granule_Metadata_Template.xml*

## Global Grid Metadata Template File

Global Grid (3X3 degree) Metadata Template file.

### Purpose

This file is used to build the IASI global grid metadata files.

### Data File Description

This is an FGDC-RSE compliant xml format metadata template file. It is a
static file that is used to build the IASI global grid metadata files.
It contains static metadata and some tags that are extracted and
replaced with dynamic information by the IASI grid metadata generation
script (*Create_IASI_L2_Metadata.pl*). Below is an example of a
Grid_Info file from June 7th, 2007:

  -----------------------------------------------------------------------
  ASC_START_DATE=20070607\
  ASC_START_TIME=00030200\
  ASC_END_DATE=20070607\
  ASC_END_TIME=23520400\
  DESC_START_DATE=20070607\
  DESC_START_TIME=00130800\
  DESC_END_DATE=20070608\
  DESC_END_TIME=00024800

  -----------------------------------------------------------------------

### Access

The Global Grid (3X3 degree) Metadata Template file is provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

The file is in the system file tree at:

*\$BASE/OPERATIONS/NRT_OPS/metadata/IASI_3X3Grid_Metadata_Template.*xml

##  *L2 Metadata Template*

### Purpose

This file is used to build the IASI L2 granule metadata files.

### Data File Description

The granule metadata template is an FGDC-RSE compliant xml format
metadata template file. It is a static file that is used to build the
IASI level 2 granule metadata files. It contains static metadata and
some tags that are extracted and replaced with dynamic information by
the IASI granule metadata generation script
(*Create_IASI_L2_Metadata.pl*).

### Access

The IASI L2 Metadata Template file is provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

The file is in the system file tree at:

*\$BASE/OPERATIONS/NRT_OPS/metadata/IASI_L2_Granule_Metadata_Template.xml*

##  *IASI CCR Metadata Template*

### Purpose

It is a static file that is used to build the IASI CCR granule metadata
files.

### Data File Description

The granule metadata template is an FGDC-RSE compliant xml format
metadata template file. It is a static file that is used to build the
IASI CCR granule metadata files. It contains static metadata and some
tags that are extracted and replaced with dynamic information by the
IASI granule metadata generation script (*Create_IASI_L2_Metadata.pl*).

### Access

The IASI CCR Metadata Template file is provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

The file is in the system file tree at:

*\$BASE/OPERATIONS/NRT_OPS/metadata/IASI_CCR_Granule_Metadata_Template.xml*

## Matchup Template File

### Purpose

The Matchup Template file is a static text file containing a list of
locations to which IASI observations will be collocated. In the current
build of the system these are only radiosonde launch sites and times.

### Data File Description

The file is an ASCII file containing the following fields for each
matchup location: latitude, longitude, year, month, day, hour, minute,
distance tolerance, and time tolerance. The distance tolerance is the
distance (in kilometers) within which IASI observations will be
considered for a collocation. The time tolerance is the time (plus or
minus minutes) around which IASI observations are considered for a
collocation. The entire template list covers a 30 hour range of data
such that it includes 24 hours from the target day plus the three hours
that overlap at the end of the previous day and the beginning of the
following day. The date information in the template consists of only
text tags. A script called *Create_Matchup_List.pl* generates a matchup
file for a given day based on this template by modifying the date tags
to insert the desired processing date's data fields.

### Access

The Matchup Template file is provided by STAR.

POC: Walter Wolf

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5003

Fax:(301) 763-8580

E-mail: walter.wolf@noaa.gov

This matchup template file resides at:

*\$BASE/OPERATIONS/NRT_OPS/matchups/radiosonde_machup_template.txt*

## EUMETSAT Level 2 BUFR Files

EUMETSAT Level 2 data files in BUFR format.

### Purpose

The IASI PPS distributes METOP instrument Level 2 products (temperature
and moisture profiles) in BUFR format via NRT/GTS link

### Data File Description

Data files contain atmospheric temperature and moisture profiles. They
would capture the fields from IASI-L2-PFS as follows:

+------------------------+---------+---+-----+----+---+--------+---+----+
| A                      | Temp    | 2 | K   | N  | 1 | u-in   | 2 | 2  |
| TMOSPHERIC_TEMPERATURE | erature |   |     | LT | 2 | teger2 |   | 16 |
|                        | (for    | 6 | kg  |    | 0 |        | 4 | 00 |
| A                      | 120     |   | /kg | N  |   | u-in   |   |    |
| TMOSPHERIC_WATER_VAPOR | IFOV    |   |     | LQ | 1 | teger4 |   | 4  |
|                        | with up |   |     |    | 2 |        |   | 32 |
|                        | to 90   |   |     |    | 0 |        |   | 00 |
|                        | v       |   |     |    |   |        |   |    |
|                        | ertical |   |     |    |   |        |   |    |
|                        | levels) |   |     |    |   |        |   |    |
|                        |         |   |     |    |   |        |   |    |
|                        | Water   |   |     |    |   |        |   |    |
|                        | vapor   |   |     |    |   |        |   |    |
|                        | (for    |   |     |    |   |        |   |    |
|                        | 120     |   |     |    |   |        |   |    |
|                        | IFOV    |   |     |    |   |        |   |    |
|                        | with up |   |     |    |   |        |   |    |
|                        | to 90   |   |     |    |   |        |   |    |
|                        | v       |   |     |    |   |        |   |    |
|                        | ertical |   |     |    |   |        |   |    |
|                        | levels) |   |     |    |   |        |   |    |
+------------------------+---------+---+-----+----+---+--------+---+----+

For atmospheric temperature profile the BUFR code is: 0-12-001.

For atmospheric moisture profile the BUFR code: 0-13-001.

Reference documents:

\[IASI-L2-PFS\]: EPS.MIS.SPE.980760 "EUMETSAT Polar System (EPS)
InfraredAtmospheric Sounding Interferometer (IASI) Level 2 Product
Format Specification (PFS)." Issue 6 Rev. 3 (08/09/2006)

### Access

The IASI data originate from the EPS MetOp2 satellite and are processed
from Level 0 up to Level 2 by European Organization of the Exploration
of Meteorological Satellites (EUMETSAT). These data files are then
pushed into remote server (GFT) (maco.nesdis.noaa.gov).

POC - Simon Elliott

Meteorological Product Implementation Manager, Operations department

Address: Am Kavalleriesand 31

Darmstadt, Hessen, 64295

Germany

Telephone: (+49) 6151 807 385

Fax: (+49) 6151 807 385

E-Mail Address: <Simon.Elliott@eumetsat.int>

OSDPD GFT Point of Contact

Vincent Tabor

NSOF, 4231 Suitland Road, Suitland, MD, 20746

Tel: (301) 457-5247

E-mail: <Vicent.Tabor@noaa.gov>

## Eigenvector Files

### Purpose

There are four eigenvector files, one for each of the three bands, and
one for the entire band. It is off-line system components which are not
part of the delivered system. These files contain the eigenvector
coefficients required for principal component radiance reconstructions.
The files will need to be updated about once every six months or if
there are major changes to the calibration of the instrument.

### Data File Description

These are binary big-endian files. They all have the same name structure
as described below:

*eigvec\_\${Year}\${Month}\${Day}\_ascii_real*

where:

*\$Year* = 2-digit year

*\$Month* = 2-digit month

*\$Day* = 2-digit day

The date string indicates when the file was generated.

### Access

All four files reside in different directories in the operational system
file directory tree:

*\$BASE/OPERATIONS/NRT_OPS/Data/pc_coeffs/band1*

*\$BASE/OPERATIONS/NRT_OPS/Data/pc_coeffs/band2*

*\$BASE/OPERATIONS/NRT_OPS/Data/pc_coeffs/band3*

*\$BASE/OPERATIONS/NRT_OPS/Data/pc_coeffs/full_band*

POC: Zhaohui Cheng

5211 Auth Road Room 204

Suitland, MD, 20746

Tel: (301) 316-5008

E-mail: <zhaohui.cheng@noaa.gov>

## Local Angle correction File

### Purpose

A coefficient file required by the retrieval to perform the local angle
correction on IASI. The file currently being delivered with this version
of the system is:

*/IASI/OPERATIONS/NRT_OPS/Data/lac_coeffs/lac_iasi_080220.bin*

If it becomes necessary to update this file, the operations staff only
needs to copy over a new file into this directory and then update the
LAC_DATE string in the NRTOPS_CONFIG which is currently set to February
20^th^, 2008:

LAC_DATE=080220

### Data File Description

The correction is only performed if the local angle correction flag is
activated ("ON") inside NRTOPS_CONFIG file as:

LAC_FLAG=ON

### Access

The local angle correction file resides in the system file directory at:

*/IASI/OPERATIONS/NRT_OPS/Data/lac_coeffs/lac_iasi\_\${YYMMDD}.bin*

where

\$YYMMDD is the 2-digit year, 2-digit month, and 2-digit day

This date string indicates the date at which the file was created.

POC: Dr. Christopher Barnet

irmen Memorial Bldg, Suite 204\
5211 Auth Road                 \
Camp Springs, MD 20746         \
voice: (301)-316-5011    fax: (301)-238-2398\
email: <chris.barnet@noaa.gov>

## *Retrieval System Files*

Static retrieval system files.

### Purpose

These are inputs to the IASI retrieval, but unlike data files, they are
static and are only updated with a delivery of the system.

### Data File Description

Table 3 contains the file name and partial path in the first column and
the second column contains a brief description of the file.

Table 3. Retrieval System Files

  ------------------------------------------ --------------------------------
  **RTA files**                              

  RTA/airs_olr.dat                           Rapid transmittance coefficients
                                             to compute Outgoing Longwave
                                             Radiation

  RTA/amsu.v7a                               Most recent version of AMSU
                                             transmittance coefficients

  RTA/binary.trcoef.iasi.v9a                 post-flight IASI RTA
                                             coefficients

  RTA/mhs.v8a                                MHS RTA coefficients

  **Cloud Averaging Table**                  

  avgcld/iasi_v9a_fm2_b.t1                   IASI cloud averaging table

  **Ensemble Error Estimate File**           

  errest/jpl_100c.inp                        Ensemble error estimate of
                                             climatology

  **MIT Retrieval Files**                    

  mit_ret/L2.M.cov100av.v1.0.0.anc           MW retrieval error covariance
                                             file

  mit_ret/L2.M.ecof_705.v1.0.0.anc           MW retrieval error covariance
                                             file

  mit_ret/L2.M.weight.hsb.v1.0.0.anc         HSB weighting file (for
                                             averaging HSB/MHS to AMSU FOV)

  mit_ret/L2.uars_clim.v1.0.3.anc.new        L2 UARS climatology file for
                                             upper atmosphere

  mit_ret/ncep_clim.bin                      Binary NCEP climatology file for
                                             T(p) and q(p)

  **Name List Files for the Main Retrieval   
  Program**                                  

  namelists/clouds_iasi.nl                   Cloud files name list

  namelists/io_iasi.nl                       Input/Output name list

  namelists/microw_iasi.nl                   Microwave file name list

  namelists/ozone_iasi.nl                    Ozone file name list

  namelists/pro_iasi.nl                      Profile file name list

  namelists/temp_iasi.nl                     Temperature file name list

  namelists/water_iasi.nl                    Water vapor file name list

  **Noise Files**                            

  noise/070124_iasi_fm2.dat                  Noise file for IASI infrared
                                             channels

  noise/L2.chan_prop.2002.05.04.v6.6.5.anc   IR noise files

  noise/L2.chan_prop.2002.07.09.v6.6.6.anc   IR noise files

  noise/L2.chan_prop.2002.08.30.v6.6.2.anc   IR noise files

  noise/L2.chan_prop.2002.09.17.v6.6.3.anc   IR noise files

  noise/L2.chan_prop.2002.10.22.v6.6.4.anc   IR noise files

  noise/L2.chan_prop.2003.01.10.v6.6.8.anc   IR noise files

  noise/L2.chan_prop.2003.11.19.v6.6.9.anc   IR noise files

  noise/airs_rawcpf.lst                      File that sets EPOCHS for noise
                                             files

  noise/amsu_300.dat                         Noise file for all microwave
                                             channels

  **RTA Error Terms**                        

  rtaerr/071019_iasi_rtaerr_v02b.asc         File containing the RTA error
                                             terms computed as half bias of
                                             the OBS-CALC(truth profile)

  **Solar Irradiance Files**                 

  solar/iasi_solar_v9a.txt                   Solar irradiance file for the
                                             radiance calculation

  **Coefficient Files to Compute Surface     
  Emissivity**                               

  surface/L2.masuda.v2.0.0.anc               Coefficients for the Masuda
                                             surface emissivity model for
                                             ocean

  surface/preprocessor.cfg                   Surface pressure preprocessing
                                             configuration template file

  **IR and MW RTA tuning coefficients for    
  the Radiance OBS-CALC Computations**       

  tuning/070115_iasi_mask.asc                IASI tuning mask file

  tuning/071019_iasi_v02b.asc                IASI tuning

  **Standard Atmosphere Profiles**           

  level2/us_std/ usstd100.asc                US Standard Atmosphere on 100
                                             levels

  **Clear Flag Coefficient Files**           

  regress/clearflag/                         Day time coefficients
  L2.I.cleartest_coef.v2.0.2.day.anc         

  regress/clearflag/                         Day time coefficient metadata
  L2.I.cleartest_coef.v2.0.2.day.anc.met     file

  regress/clearflag/                         Night time coefficients
  L2.I.cleartest_coef.v2.0.2.night.anc       

  regress/clearflag/                         Night time metadata file
  L2.I.cleartest_coef.v2.0.2.night.anc.met   

  **Regression Coefficient Files**           

  regress/iasi/070804_iasi.eig               NOAA IR regression radiance
                                             eigenvector file

  regress/iasi/070804_iasi.frq               NOAA IR regression frequency
                                             file

  regress/iasi/071116_iasi_cldy.reg          NOAA IR cloudy regression
                                             coefficient file

  regress/iasi/071215_iasi_ccr.reg           NOAA IR cloud-clear regression
                                             coefficient file
  ------------------------------------------ --------------------------------

### Access

These files all reside in subdirectories located of the *retrieval*
subdirectory. The *retrieval* subdirectory is, in turn, located off of
the system file directory:

*\$BASE/ OPERATIONS/NRT_OPS/retrieval*

All the files described below in Table 3 are located in directories
relative to this system directory.

POC: Dr. Christopher Barnet

irmen Memorial Bldg, Suite 204\
5211 Auth Road                 \
Camp Springs, MD 20746         \
voice: (301)-316-5011    fax: (301)-238-2398\
email: <chris.barnet@noaa.gov>

## *AMSU-A* **Orbital file***s*

### Purpose

These files are required for the generation of all IASI Level 2
products.

### Data File Description

These are big endian direct access binary files. The format and content
of these files are described online in the NOAA KLM User's Guide at:

<http://www2.ncdc.noaa.gov/docs/klm/index.htm>

These files are required for the generation of all IASI Level 2
products. Each file contains a \~100 minute orbit of data starting from,
and ending at, the north pole. Therefore, in a given day there are
nominally \~14 orbital files.

The AMSU-A file sizes are nominally 1.9 -- 2.0 megabytes. Occasionally,
these files will be smaller if there are problems with the preprocessing
upstream at OSDPD or on the satellite. Smaller files are typically the
result of missing scans and are not necessarily corrupted data.

All NOAA product file name structures are described at:

<http://www2.ncdc.noaa.gov/docs/klm/html/c8/s8-2.htm>

The AMSU-A file name structure for MetOp-A products is as follows:

\${PCC}.\${DDDD}.M2.D\${YY}\${DOY}.S\${HHMM}.E\${HHMM}.B\${BBBBBBB}.\${GS}

Where:

\$PCC = 3-character processing center ID (e.g. NSS = NOAA/NESDIS
Suitland, MD)

\$DDDD = 4-character data type ID (e.g. AMAX = AMSU-A )

M2 = Spacecraft ID (e.g. M2 = MetOp-A)

\$YY = 2-digit year

\$DOY = 3-digit day of year (1-365)

S = Start time indicator

\$HHMM = 2-digit hour and 2-digit minute

E = Ending time indicator

B = Processing block ID indicator

\$BBBBBBB = 7-digit processing block ID number

\$GS = 2-character acquisition ground station ID (SV = Svalbard, Norway)

As an example, here is AMSU-A file name for Februrary 8^th^, 2008
beginning at 07:11 GMT and ending at 08:54 GMT:

NSS.AMAX.M2.D08039.S0711.E0854.B0677172.SV

### Access

AMSU-A L1B format orbital files from MetOp-A are available to the system
through the DDS as shown in Figure 2. This acquisition is performed by
the Perl script called *Run_Get_L1B_Files.pl.* This script is a
component within the L1B Processing unit. Nominally, the files arrive in
the system approximately every 100 minutes at:

*\$BASE/L1B/AMSUA*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## MHS Orbital files

### Purpose

These files are required for the generation of all IASI Level 2
products.

### Data File Description

These are big endian direct access binary files. The format and content
of these files are described online in the NOAA KLM User's Guide at:

<http://www2.ncdc.noaa.gov/docs/klm/index.htm>

Each file contains a \~100 minute orbit of data starting from, and
ending at, the north pole. Therefore, in a given day there are nominally
\~14 orbital files.

The MHS file sizes are nominally 6.9 -- 7.2 megabytes. Occasionally,
these files will be smaller if there are problems with the preprocessing
upstream at OSDPD or on the satellite. Smaller files are typically the
result of missing scans and are not necessarily corrupted data.

All NOAA product file name structures are described at:

<http://www2.ncdc.noaa.gov/docs/klm/html/c8/s8-2.htm>

The MHS L1B file name structure for MetOp-A products is as follows:

\${PCC}.\${DDDD}.M2.D\${YY}\${DOY}.S\${HHMM}.E\${HHMM}.B\${BBBBBBB}.\${GS}

Where:

\$PCC = 3-character processing center ID (e.g. NSS = NOAA/NESDIS
Suitland, MD)

\$DDDD = 4-character data type ID (e.g. MHSX = MHS)

M2 = Spacecraft ID (e.g. M2 = MetOp-A)

\$YY = 2-digit year

\$DOY = 3-digit day of year (1-365)

S = Start time indicator

\$HHMM = 2-digit hour and 2-digit minute

E = Ending time indicator

B = Processing block ID indicator

\$BBBBBBB = 7-digit processing block ID number

\$GS = 2-character acquisition ground station ID (SV = Svalbard, Norway)

As an example, here is MHS file name for Februrary 8^th^, 2008 beginning
at 07:11 GMT and ending at 08:54 GMT:

NSS.MHSX.M2.D08039.S0711.E0854.B0677172.SV

### Access

MHS L1B format orbital files from MetOp-A are available to the system
through the DDS as shown in Figure 2. This acquisition is performed by
the Perl script called *Run_Get_L1B_Files.pl.* This script is a
component within the L1B Processing unit. Nominally, the files arrive in
the system approximately every 100 minutes at:

*\$BASE/L1B/MHS*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

# Intermediate Data Sets

Intermediate datasets and files used in IASI PPS are described in this
section. It is those data sets that are created during processing as a
bridge between different software units. The processing errors are
described in details in the Operations Manual, section 7 (NESDIS/STAR
2008c). To get a sense of where these files fit within the IASI PPS, the
reader is referred to Figures 1-10. Table 4 provides a summary
description of these data files.

[]{#__RefHeading___Toc193253835 .anchor}Table 4 . Intermediate Data Sets

  --------------- ------------- --------------- --------------------- ------------
  **File          **Spectral    **Data type**   **Spatial Subset**    **Format**
  Content**       Subset**                                            

  IIASI radiance  616 channels  IASI radiance   Warmest FOV from      NetCDF
                                                every ROR             

  IASI radiance   616 channels  IASI radiance   First FOV from every  NetCDF
                                                FOR                   

  IASI radiance   616 channels  IASI radiance   All 9 FOVs from every NetCDF
                                                FOR                   

  IASI            616 channels  IASI            1 FOV from every FOR  NetCDF
  reconstructed                 reconstructed                         
  Radiance                      Radiance                              
  (1band)                       (1band)                               

  IASI            616 channels  IASI            1 FOV from every FOR  NetCDF
  reconstructed                 Reconstructed                         
  Radiance                      Radiance                              
  (3band)                       (3band)                               

  IASI            616 channels  IASI            4 FOV from every FOR  NetCDF
  reconstructed                 Reconstructed                         
  Radiance                      Radiance                              
  (1band)                       (1band)                               

  IASI            616 channels  IASI            4 FOV from every FOR  NetCDF
  reconstructed                 Reconstructed                         
  Radiance                      Radiance                              
  (3band)                       (3band)                               

  IASI Radiances  8461 channels IASI Radiances  4 FOV from every FOR  NetCDF

  IASI Radiances  8461 channels IASI Radiances  4 FOVs from 2         NetCDF
                                                scans/granule         

  IASI radiance   8461 channels IASI radiance   All FOV               binary

  AMSU-A radiance 15 channels   AMSU-A Radiance All FOV               binary

  MHS radiance    5 channels    MHS radiance    All FOV               binary

  L2 profiles     100 levels    Profiles        All FOR               binary

  IASI system     N/A           IASI system     N/A                   ASCII
  metadata (Text)               metadata (Text)                       

  FOV = Field of                                                      
  View; FOR =                                                         
  Field of                                                            
  Regard;                                                             
  --------------- ------------- --------------- --------------------- ------------

## IASI L1C Full Resolution Subset Files

IASI L1CT NetCDF full resolution (8461 channels) granule files (subset
according to the scheme specified in the input CDL template).

### Purpose

-   To generate IASI L1CT BUFR granule file.

-   To generate global binary data sets for validation and to use as an
    input for the global matchups.

    -   To generate a global coverage binary file of the full resolution
        data and a file containing only the locations and times of the
        full resolution data. Both files are used together by the global
        matchups downstream.

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-   To generate binaries of global coverage for eigenvector generation.

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-   To generate globally gridded data sets for validation and climate
    reprocessing.

    -   To generate daily 3\*3 global grids of the full spatial
        resolution RR and PCS generated from 1 band.

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-   To generate daily 3\*3 global grids of the full spatial resolution
    RR and PCS generated from 3 bands.

-   To generate daily 3\*3 global grids of the full resolution IASI
    radiances.

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-   To generate IASI L1CT NetCDF files containing the warmest FOV from
    full resolution IASI L1CT.

### Data File Description

The NetCDF files are intermediate subset files generated from the IASI
PFS files by the *main_iasi_level1c_subsetter* program. This program is
part of the L1C Subsetter unit (figure 4).

[]{#__RefHeading___Toc193253836 .anchor}Table 5 Full resolution NetCDF
header

+---------+------------------------------------------------------------+
| Data    | iasi_all_8461\_\$YYYYMMDD_Granule-\$GGG.nc\                |
| file    | where:\                                                    |
| -naming | \$YYYYMMDD = 8-digit year month day format (e.g.           |
| Con     | 20070517)\                                                 |
| vention | \$GGG = the 3-digit granule number (e.g. 088).  The        |
|         | granule number can go from 001 to 480.                     |
| Array   |                                                            |
| di      |       Number_of_Dice = 660 ;      // Number dice written\  |
| mension |        Number_of_Dots = 4 ;  // Number of IASI FOVS in a   |
| va      | die\                                                       |
| riables |        Number_of_IASI_Channels = 8461 ;  // Number of IASI |
|         | Channels\                                                  |
| Va      |        Number_of_IASI_Frequencies = 8461 ;      // Number  |
| riables | of IASI Clear Frequencies\                                 |
|         |        Number_of_AVHRR_Channels = 6;  // Number of AVHRR   |
|         | channels\                                                  |
|         |        Number_of_AVHRR_FOV_Classes = 7;  // Number of      |
|         | AVHRR sounder FOV classes\                                 |
|         |        Number_of_AVHRR_Frequencies = 6;\                   |
|         |        Number_of_IASI_Image_Pixels = 4096; // 64 X 64      |
|         | Pixel IASI image                                           |
|         |                                                            |
|         | long    IASI_Channels(Number_of_IASI_Channels) ;\          |
|         |                IASI_Channels:long_name = \"Channel number  |
|         | for data\" ;\                                              |
|         |                IASI_Channels:units = \"none\" ;\           |
|         |                IASI_Channels:scale_factor = 1.0d ;\        |
|         |                IASI_Channels:add_offset = 0.0d ;\          |
|         |                IASI_Channels:parameter_type = \"IASI       |
|         | data\" ;\                                                  |
|         |                IASI_Channels:valid_range = 1.0f, 8461.0f   |
|         | ;\                                                         |
|         |                IASI_Channels:\_FillValue = -9999 ;\        |
|         | \                                                          |
|         |        float                                               |
|         | IASI_Frequencies(Number_of_IASI_Frequencies) ;\            |
|         |                IASI_Frequencies:long_name = \"Frequency at |
|         | which the data is taken\" ;\                               |
|         |                IASI_Frequencies:units = \"wavenumber       |
|         | cm-1\" ;\                                                  |
|         |                IASI_Frequencies:scale_factor = 1.0d ;\     |
|         |                IASI_Frequencies:add_offset = 0.0d ;\       |
|         |                IASI_Frequencies:parameter_type = \"IASI    |
|         | data\" ;\                                                  |
|         |                IASI_Frequencies:valid_range = 0.0f,        |
|         | 10000.0f ;\                                                |
|         |                IASI_Frequencies:\_FillValue = -9999.0f ;\  |
|         | \                                                          |
|         |        long   AVHRR_Channels(Number_of_AVHRR_Channels) ;\  |
|         |                AVHRR_Channels:long_name = \"Channel number |
|         | for data\" ;\                                              |
|         |                AVHRR_Channels:units = \"none\" ;\          |
|         |                AVHRR_Channels:scale_factor = 1.0d ;\       |
|         |                AVHRR_Channels:add_offset = 0.0d ;\         |
|         |                AVHRR_Channels:parameter_type = \"AVHRR     |
|         | data\" ;\                                                  |
|         |                AVHRR_Channels:valid_range = 1.0f, 6.0f ;\  |
|         |                AVHRR_Channels:\_FillValue = -9999 ;\       |
|         | \                                                          |
|         |        float                                               |
|         | AVHRR_Frequencies(Number_of_AVHRR_Frequencies) ;\          |
|         |                AVHRR_Frequencies:long_name = \"Frequency   |
|         | at which the data is taken\" ;\                            |
|         |                AVHRR_Frequencies:units = \"wavenumber      |
|         | cm-1\" ;\                                                  |
|         |                AVHRR_Frequencies:scale_factor = 1.0d ;\    |
|         |                AVHRR_Frequencies:add_offset = 0.0d ;\      |
|         |                AVHRR_Frequencies:parameter_type = \"AVHRR  |
|         | data\" ;\                                                  |
|         |                AVHRR_Frequencies:valid_range = 0.0f,       |
|         | 16000.0f ;\                                                |
|         |                AVHRR_Frequencies:\_FillValue = -9999.0f ;\ |
|         | \                                                          |
|         |        long                                                |
|         | AVHRR_FOV_Classes(Number_of_AVHRR_FOV_Classes) ;\          |
|         |                AVHRR_FOV_Classes:long_name = \"The index   |
|         | of the AVHRR FOV sounder class\" ;\                        |
|         |                AVHRR_FOV_Classes:units = \"none\" ;\       |
|         |                AVHRR_FOV_Classes:scale_factor = 1.0d ;\    |
|         |                AVHRR_FOV_Classes:add_offset = 0.0d ;\      |
|         |                AVHRR_FOV_Classes:parameter_type = \"AVHRR  |
|         | data\" ;\                                                  |
|         |                AVHRR_FOV_Classes:valid_range = 1.0f, 7.0f  |
|         | ;\                                                         |
|         |                AVHRR_FOV_Classes:\_FillValue = -9999 ;\    |
|         | \                                                          |
|         |        long    Dice(Number_of_Dice) ;\                     |
|         |                Dice:long_name = \"The index of the IASI    |
|         | fields of regard\" ;\                                      |
|         |                Dice:units = \"none\" ;\                    |
|         |                Dice:scale_factor = 1.0d ;\                 |
|         |                Dice:add_offset = 0.0d ;\                   |
|         |                Dice:parameter_type = \"IASI data\" ;\      |
|         |                Dice:valid_range = 1.0f, 660.0f ;\          |
|         |                Dice:\_FillValue = -9999 ;\                 |
|         | \                                                          |
|         |        long    Dots(Number_of_Dots) ;\                     |
|         |                Dots:long_name = \"The index of the IASI    |
|         | fields of view\" ;\                                        |
|         |                Dots:units = \"none\" ;\                    |
|         |                Dots:scale_factor = 1.0d ;\                 |
|         |                Dots:add_offset = 0.0d ;\                   |
|         |                Dots:parameter_type = \"IASI data\" ;\      |
|         |                Dots:valid_range = 1.0f, 4.0f ;\            |
|         |                Dots:\_FillValue = -9999 ;\                 |
|         | \                                                          |
|         |        long    Scan_Line(Number_of_Dice,Number_of_Dots) ;\ |
|         |                Scan_Line:long_name = \"The number of the   |
|         | current scan line\" ;\                                     |
|         |                Scan_Line:units = \"none\" ;\               |
|         |                Scan_Line:scale_factor = 1.0d ;\            |
|         |                Scan_Line:add_offset = 0.0d ;\              |
|         |                Scan_Line:parameter_type = \"IASI data\" ;\ |
|         |                Scan_Line:valid_range = 1.0f, 22.0f ;\      |
|         |                Scan_Line:\_FillValue = -9999 ;\            |
|         | \                                                          |
|         |        long    AMSU_FOV(Number_of_Dice,Number_of_Dots) ;\  |
|         |                AMSU_FOV:long_name = \"The number of the    |
|         | current AMSU FOV\" ;\                                      |
|         |                AMSU_FOV:units = \"none\" ;\                |
|         |                AMSU_FOV:scale_factor = 1.0d ;\             |
|         |                AMSU_FOV:add_offset = 0.0d ;\               |
|         |                AMSU_FOV:parameter_type = \"IASI data\" ;\  |
|         |                AMSU_FOV:valid_range = 1.0f, 30.0f ;\       |
|         |                AMSU_FOV:\_FillValue = -9999 ;\             |
|         | \                                                          |
|         |        long    IASI_FOV(Number_of_Dice,Number_of_Dots) ;\  |
|         |                IASI_FOV:long_name = \"The number of the    |
|         | current IASI FOV\" ;\                                      |
|         |                IASI_FOV:units = \"none\" ;\                |
|         |                IASI_FOV:scale_factor = 1.0d ;\             |
|         |                IASI_FOV:add_offset = 0.0d ;\               |
|         |                IASI_FOV:parameter_type = \"IASI data\" ;\  |
|         |                IASI_FOV:valid_range = 1.0f, 4.0f ;\        |
|         |                IASI_FOV:\_FillValue = -9999 ;\             |
|         | \                                                          |
|         |        short GQisFlagQual(Number_of_Dice,Number_of_Dots)   |
|         | ;\                                                         |
|         |                GQisFlagQual:long_name = \"System QC flag\" |
|         | ;\                                                         |
|         |                GQisFlagQual:units = \"none\" ;\            |
|         |                GQisFlagQual:scale_factor = 1 ;\            |
|         |                GQisFlagQual:add_offset = 0 ;\              |
|         |                GQisFlagQual:parameter_type = \"IASI data\" |
|         | ;\                                                         |
|         |                GQisFlagQual:valid_range = 0, 1 ;\          |
|         |                GQisFlagQual:\_FillValue = -9999s ;\        |
|         | \                                                          |
|         |        float                                               |
|         | GQisQualIndex(Number_of_Dice,Number_of_Dots) ;\            |
|         |                GQisQualIndex:long_name = \"System QC       |
|         | flag\" ;\                                                  |
|         |                GQisQualIndex:units = \"none\" ;\           |
|         |                GQisQualIndex:scale_factor = 1.0d ;\        |
|         |                GQisQualIndex:add_offset = 0.0d ;\          |
|         |                GQisQualIndex:parameter_type = \"IASI       |
|         | data\" ;\                                                  |
|         |                GQisQualIndex:valid_range = 0.0f, 9999.0f   |
|         | ;\                                                         |
|         |                GQisQualIndex:\_FillValue = -9999.0f ;\     |
|         | \                                                          |
|         |        float                                               |
|         | GQisQualIndexLoc(Number_of_Dice,Number_of_Dots) ;\         |
|         |                GQisQualIndexLoc:long_name = \"System QC    |
|         | flag\" ;\                                                  |
|         |                GQisQualIndexLoc:units = \"none\" ;\        |
|         |                GQisQualIndexLoc:scale_factor = 1.0d ;\     |
|         |                GQisQualIndexLoc:add_offset = 0.0d ;\       |
|         |                GQisQualIndexLoc:parameter_type = \"IASI    |
|         | data\" ;\                                                  |
|         |                GQisQualIndexLoc:valid_range = 0.0f,        |
|         | 9999.0f ;\                                                 |
|         |                GQisQualIndexLoc:\_FillValue = -9999.0f ;\  |
|         | \                                                          |
|         |        float                                               |
|         | GQisQualIndexRad(Number_of_Dice,Number_of_Dots) ;\         |
|         |                GQisQualIndexRad:long_name = \"System QC    |
|         | flag\" ;\                                                  |
|         |                GQisQualIndexRad:units = \"none\" ;\        |
|         |                GQisQualIndexRad:scale_factor = 1.0d ;\     |
|         |                GQisQualIndexRad:add_offset = 0.0d ;\       |
|         |                GQisQualIndexRad:parameter_type = \"IASI    |
|         | data\" ;\                                                  |
|         |                GQisQualIndexRad:valid_range = 0.0f,        |
|         | 9999.0f ;\                                                 |
|         |                GQisQualIndexRad:\_FillValue = -9999.0f ;\  |
|         | \                                                          |
|         |        float                                               |
|         | GQisQualIndexSpect(Number_of_Dice,Number_of_Dots) ;\       |
|         |                GQisQualIndexSpect:long_name = \"System QC  |
|         | flag\" ;\                                                  |
|         |                GQisQualIndexSpect:units = \"none\" ;\      |
|         |                GQisQualIndexSpect:scale_factor = 1.0d ;\   |
|         |                GQisQualIndexSpect:add_offset = 0.0d ;\     |
|         |                GQisQualIndexSpect:parameter_type = \"IASI  |
|         | data\" ;\                                                  |
|         |                GQisQualIndexSpect:valid_range = 0.0f,      |
|         | 9999.0f ;\                                                 |
|         |                GQisQualIndexSpect:\_FillValue = -9999.0f   |
|         | ;\                                                         |
|         | \                                                          |
|         |        float                                               |
|         | GQisSysTecSondQual(Number_of_Dice,Number_of_Dots) ;\       |
|         |                GQisSysTecSondQual:long_name = \"System QC  |
|         | flag\" ;\                                                  |
|         |                GQisSysTecSondQual:units = \"none\" ;\      |
|         |                GQisSysTecSondQual:scale_factor = 1.0d ;\   |
|         |                GQisSysTecSondQual:add_offset = 0.0d ;\     |
|         |                GQisSysTecSondQual:parameter_type = \"IASI  |
|         | data\" ;\                                                  |
|         |                GQisSysTecSondQual:valid_range = 0.0f,      |
|         | 9999.0f ;\                                                 |
|         |                GQisSysTecSondQual:\_FillValue = -9999.0f   |
|         | ;\                                                         |
|         | \                                                          |
|         |        double Time(Number_of_Dice,Number_of_Dots) ;\       |
|         |                Time:long_name = \"UTC Milliseconds since   |
|         | Jan 1, 1970\" ;\                                           |
|         |                Time:units = \"msec\" ;\                    |
|         |                Time:scale_factor = 1.0d ;\                 |
|         |                Time:add_offset = 0.0d ;\                   |
|         |                Time:parameter_type = \"IASI data\" ;\      |
|         |                Time:valid_range = 0.0f, 1577836800000.0f   |
|         | ;\                                                         |
|         |                Time:\_FillValue = -9999.0 ;\               |
|         | \                                                          |
|         |        float Latitude(Number_of_Dice,Number_of_Dots) ;\    |
|         |                Latitude:long_name = \"IASI Latitude values |
|         | for each FOV\" ;\                                          |
|         |                Latitude:units = \"degrees North\" ;\       |
|         |                Latitude:scale_factor = 1.0d ;\             |
|         |                Latitude:add_offset = 0.0d ;\               |
|         |                Latitude:parameter_type = \"IASI data\" ;\  |
|         |                Latitude:valid_range = 90.0f, -90.0f ;\     |
|         |                Latitude:\_FillValue = -9999.0f ;\          |
|         | \                                                          |
|         |        float Longitude(Number_of_Dice,Number_of_Dots) ;\   |
|         |                Longitude:long_name = \"IASI Longitude      |
|         | values for each FOV\" ;\                                   |
|         |                Longitude:units = \"degrees East\" ;\       |
|         |                Longitude:scale_factor = 1.0d ;\            |
|         |                Longitude:add_offset = 0.0d ;\              |
|         |                Longitude:parameter_type = \"IASI data\" ;\ |
|         |                Longitude:valid_range = -180.0f, 179.99f ;\ |
|         |                Longitude:\_FillValue = -9999.0f ;\         |
|         | \                                                          |
|         |        float                                               |
|         | IASI_Radian                                                |
|         | ces(Number_of_Dice,Number_of_Dots,Number_of_IASI_Channels) |
|         | ;\                                                         |
|         |                IASI_Radiances:long_name = \"IASI Radiances |
|         | for each FOV\" ;\                                          |
|         |                IASI_Radiances:units = \"mW/m2/cm-1/sr\" ;\ |
|         |                IASI_Radiances:scale_factor = 1.0d ;\       |
|         |                IASI_Radiances:add_offset = 0.0d ;\         |
|         |                IASI_Radiances:parameter_type = \"IASI      |
|         | data\" ;\                                                  |
|         |                IASI_Radiances:valid_range = 0.0f, 40000.0f |
|         | ;\                                                         |
|         |                IASI_Radiances:\_FillValue = -9999.0f ;\    |
|         | \                                                          |
|         |        float                                               |
|         | IASI_Image(Number_of_Dice,Number_of_IASI_Image_Pixels) ;\  |
|         |                IASI_Image:long_name = \"IASI Image for     |
|         | each FOR\" ;\                                              |
|         |                IASI_Image:units = \"mW/m2/cm-1/sr\" ;\     |
|         |                IASI_Image:scale_factor = 1.0d ;\           |
|         |                IASI_Image:add_offset = 0.0d ;\             |
|         |                IASI_Image:parameter_type = \"IASI data\"   |
|         | ;\                                                         |
|         |                IASI_Image:valid_range = 0.0f, 40000.0f ;\  |
|         |                IASI_Image:\_FillValue = -9999.0f ;\        |
|         | \                                                          |
|         |        short                                               |
|         | AVHRR_Channel_Combo(Number_of_Dice,Number_of_Dots) ;\      |
|         |                AVHRR_Channel_Combo:long_name = \"AVHRR     |
|         | Channels used in radiance analysis\" ;\                    |
|         |                AVHRR_Channel_Combo:units = \"none\" ;\     |
|         |                AVHRR_Channel_Combo:scale_factor = 1 ;\     |
|         |                AVHRR_Channel_Combo:add_offset = 0 ;\       |
|         |                AVHRR_Channel_Combo:parameter_type = \"IASI |
|         | data\" ;\                                                  |
|         |                AVHRR_Channel_Combo:valid_range = 0, 1 ;\   |
|         |                AVHRR_Channel_Combo:\_FillValue = -9999s ;\ |
|         | \                                                          |
|         |        float                                               |
|         | Fraction_of                                                |
|         | _Clear_AVHRR(Number_of_Dice,Number_of_Dots,Number_of_AVHRR |
|         |                                                            |
|         | \_FOV_Classes) ;\                                          |
|         |                Fraction_of_Clear_AVHRR:long_name =         |
|         | \"Percent clear for each AVHRR FOV class\" ;\              |
|         |                Fraction_of_Clear_AVHRR:units = \"%\" ;\    |
|         |                Fraction_of_Clear_AVHRR:scale_factor = 1.0d |
|         | ;\                                                         |
|         |                Fraction_of_Clear_AVHRR:add_offset = 0.0d   |
|         | ;\                                                         |
|         |                Fraction_of_Clear_AVHRR:parameter_type =    |
|         | \"AVHRR data\" ;\                                          |
|         |                Fraction_of_Clear_AVHRR:valid_range = 0.0f, |
|         | 100.0f ;\                                                  |
|         |                Fraction_of_Clear_AVHRR:\_FillValue =       |
|         | -9999.0f ;\                                                |
|         | \                                                          |
|         |        float                                               |
|         | AVHRR_Y_Angle_Center_                                      |
|         | of_Gravity(Number_of_Dice,Number_of_Dots,Number_of_AVHRR\_ |
|         |                                                            |
|         | FOV_Classes) ;\                                            |
|         |                AVHRR_Y_Angle_Center_of_Gravity:long_name = |
|         | \"Y angular position of the center of gravity\" ;\         |
|         |                AVHRR_Y_Angle_Center_of_Gravity:units =     |
|         | \"degrees\" ;\                                             |
|         |                                                            |
|         | AVHRR_Y_Angle_Center_of_Gravity:scale_factor = 1.0d ;\     |
|         |                AVHRR_Y_Angle_Center_of_Gravity:add_offset  |
|         | = 0.0d ;\                                                  |
|         |                                                            |
|         | AVHRR_Y_Angle_Center_of_Gravity:parameter_type = \"AVHRR   |
|         | data\" ;\                                                  |
|         |                AVHRR_Y_Angle_Center_of_Gravity:valid_range |
|         | = 0.0f, 360.0f ;\                                          |
|         |                AVHRR_Y_Angle_Center_of_Gravity:\_FillValue |
|         | = -9999.0f ;\                                              |
|         | \                                                          |
|         |        float                                               |
|         | AVHRR_Z_Angle_Center_                                      |
|         | of_Gravity(Number_of_Dice,Number_of_Dots,Number_of_AVHRR\_ |
|         |                                                            |
|         | FOV_Classes) ;\                                            |
|         |                AVHRR_Z_Angle_Center_of_Gravity:long_name = |
|         | \"Z angular position of the center of gravity\" ;\         |
|         |                AVHRR_Z_Angle_Center_of_Gravity:units =     |
|         | \"degrees\" ;\                                             |
|         |                                                            |
|         | AVHRR_Z_Angle_Center_of_Gravity:scale_factor = 1.0d ;\     |
|         |                AVHRR_Z_Angle_Center_of_Gravity:add_offset  |
|         | = 0.0d ;\                                                  |
|         |                                                            |
|         | AVHRR_Z_Angle_Center_of_Gravity:parameter_type = \"AVHRR   |
|         | data\" ;\                                                  |
|         |                AVHRR_Z_Angle_Center_of_Gravity:valid_range |
|         | = 0.0f, 360.0f ;\                                          |
|         |                AVHRR_Z_Angle_Center_of_Gravity:\_FillValue |
|         | = -9999.0f ;\                                              |
|         | \                                                          |
|         |        float                                               |
|         | AVHRR_Mean_Rad                                             |
|         | iances(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV\_ |
|         |                                                            |
|         | Classes,Number_of_AVHRR_Channels) ;\                       |
|         |                AVHRR_Mean_Radiances:long_name = \"Mean     |
|         | AVHRR radiances for each FOV\" ;\                          |
|         |                AVHRR_Mean_Radiances:units =                |
|         | \"mW/m2/cm-1/sr\" ;\                                       |
|         |                AVHRR_Mean_Radiances:scale_factor = 1.0d ;\ |
|         |                AVHRR_Mean_Radiances:add_offset = 0.0d ;\   |
|         |                AVHRR_Mean_Radiances:parameter_type =       |
|         | \"AVHRR data\" ;\                                          |
|         |                AVHRR_Mean_Radiances:valid_range = 0.0f,    |
|         | 40000.0f ;\                                                |
|         |                AVHRR_Mean_Radiances:\_FillValue = -9999.0f |
|         | ;\                                                         |
|         | \                                                          |
|         |        float                                               |
|         | AVHRR_Std_Rad                                              |
|         | iances(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV\_ |
|         |                                                            |
|         | Classes,Number_of_AVHRR_Channels) ;\                       |
|         |                AVHRR_Std_Radiances:long_name = \"Standard  |
|         | deviation of radiances for each FOV\" ;\                   |
|         |                AVHRR_Std_Radiances:units =                 |
|         | \"mW/m2/cm-1/sr\" ;\                                       |
|         |                AVHRR_Std_Radiances:scale_factor = 1.0d ;\  |
|         |                AVHRR_Std_Radiances:add_offset = 0.0d ;\    |
|         |                AVHRR_Std_Radiances:parameter_type =        |
|         | \"AVHRR data\" ;\                                          |
|         |                AVHRR_Std_Radiances:valid_range = 0.0f,     |
|         | 40000.0f ;\                                                |
|         |                AVHRR_Std_Radiances:\_FillValue = -9999.0f  |
|         | ;\                                                         |
|         | \                                                          |
|         |        float View_Angle(Number_of_Dice,Number_of_Dots) ;\  |
|         |                View_Angle:long_name = \"IASI View Angles   |
|         | for each FOV\" ;\                                          |
|         |                View_Angle:units = \"degrees\" ;\           |
|         |                View_Angle:scale_factor = 1.0d ;\           |
|         |                View_Angle:add_offset = 0.0d ;\             |
|         |                View_Angle:parameter_type = \"IASI data\"   |
|         | ;\                                                         |
|         |                View_Angle:valid_range = -90.0f, 90.0f ;\   |
|         |                View_Angle:\_FillValue = -9999.0f ;\        |
|         | \                                                          |
|         |        float                                               |
|         | Satellite_Height(Number_of_Dice,Number_of_Dots) ;\         |
|         |                Satellite_Height:long_name = \"Satellite    |
|         | height above each FOV\" ;\                                 |
|         |                Satellite_Height:units = \"km\" ;\          |
|         |                Satellite_Height:scale_factor = 1.0 ;\      |
|         |                Satellite_Height:add_offset = 0.0 ;\        |
|         |                Satellite_Height:parameter_type = \"IASI    |
|         | data\" ;\                                                  |
|         |                Satellite_Height:valid_range = 0.0f,        |
|         | 1000.0f ;\                                                 |
|         |                Satellite_Height:\_FillValue = -9999.0f ;\  |
|         | \                                                          |
|         |        float                                               |
|         | Satellite_Zenith(Number_of_Dice,Number_of_Dots) ;\         |
|         |                Satellite_Zenith:long_name = \"Satellite    |
|         | zenith angles for each FOV\" ;\                            |
|         |                Satellite_Zenith:units = \"degrees\" ;\     |
|         |                Satellite_Zenith:scale_factor = 1.0 ;\      |
|         |                Satellite_Zenith:add_offset = 0.0 ;\        |
|         |                Satellite_Zenith:parameter_type = \"IASI    |
|         | data\" ;\                                                  |
|         |                Satellite_Zenith:valid_range = 0.0f, 90.0f  |
|         | ;\                                                         |
|         |                Satellite_Zenith:\_FillValue = -9999.0f ;\  |
|         | \                                                          |
|         |        float                                               |
|         | Satellite_Azimuth(Number_of_Dice,Number_of_Dots) ;\        |
|         |                Satellite_Azimuth:long_name = \"Satellite   |
|         | azimuth angles for each FOV\" ;\                           |
|         |                Satellite_Azimuth:units = \"degrees\" ;\    |
|         |                Satellite_Azimuth:scale_factor = 1.0 ;\     |
|         |                Satellite_Azimuth:add_offset = 0.0 ;\       |
|         |                Satellite_Azimuth:parameter_type = \"IASI   |
|         | data\" ;\                                                  |
|         |                Satellite_Azimuth:valid_range = 0.0f,       |
|         | 180.0f ;\                                                  |
|         |                Satellite_Azimuth:\_FillValue = -9999.0f ;\ |
|         | \                                                          |
|         |        float Solar_Zenith(Number_of_Dice, Number_of_Dots)  |
|         | ;\                                                         |
|         |                Solar_Zenith:long_name = \"Solar zenith     |
|         | angles for each FOV\" ;\                                   |
|         |                Solar_Zenith:units = \"degrees\" ;\         |
|         |                Solar_Zenith:scale_factor = 1.0 ;\          |
|         |                Solar_Zenith:add_offset = 0.0 ;\            |
|         |                Solar_Zenith:parameter_type = \"IASI data\" |
|         | ;\                                                         |
|         |                Solar_Zenith:valid_range = 0.f, 90.f ;\     |
|         |                Solar_Zenith:\_FillValue = -9999.f ;\       |
|         | \                                                          |
|         |        float Solar_Azimuth(Number_of_Dice, Number_of_Dots) |
|         | ;\                                                         |
|         |                Solar_Azimuth:long_name = \"Solar azimuth   |
|         | angles for each FOV\" ;\                                   |
|         |                Solar_Azimuth:units = \"degrees\" ;\        |
|         |                Solar_Azimuth:scale_factor = 1.0 ;\         |
|         |                Solar_Azimuth:add_offset = 0.0 ;\           |
|         |                Solar_Azimuth:parameter_type = \"IASI       |
|         | data\" ;\                                                  |
|         |                Solar_Azimuth:valid_range = 0.f, 180.f ;\   |
|         |                Solar_Azimuth:\_FillValue = -9999.f ;\      |
|         | \                                                          |
|         |        short Ascending_Descending(Number_of_Dice,          |
|         | Number_of_Dots) ;\                                         |
|         |                Ascending_Descending:long_name =            |
|         | \"0=Descending, 1=Ascending\" ;\                           |
|         |                Ascending_Descending:units = \"none\" ;\    |
|         |                Ascending_Descending:scale_factor = 1 ;\    |
|         |                Ascending_Descending:add_offset = 0 ;\      |
|         |                Ascending_Descending:parameter_type =       |
|         | \"IASI data\" ;\                                           |
|         |                Ascending_Descending:valid_range = 0, 1 ;\  |
|         |                Ascending_Descending:\_FillValue = -9999s   |
|         | ;\                                                         |
|         | \                                                          |
|         |        long   Orbit_Number(Number_of_Dice,Number_of_Dots)  |
|         | ;\                                                         |
|         |                Orbit_Number:long_name = \"The number of    |
|         | the current orbit\" ;\                                     |
|         |                Orbit_Number:units = \"none\" ;\            |
|         |                Orbit_Number:scale_factor = 1.0d ;\         |
|         |                Orbit_Number:add_offset = 0.0d ;\           |
|         |                Orbit_Number:parameter_type = \"IASI data\" |
|         | ;\                                                         |
|         |                Orbit_Number:valid_range = 1.0f, 100000.0f  |
|         | ;\                                                         |
|         |                Orbit_Number:\_FillValue = -9999 ;          |
+---------+------------------------------------------------------------+

The information about the tools a user must use to manipulate a NetCDF
file, could be found at: <http://www.unidata.ucar.edu/software/netcdf/>

### Access

These files are created in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1c*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

These files are not maintained after processing.

## IASI L1CT Thinned Subset Files

IASI L1CT NetCDF thinned (616 channels) granule files (subset according
to the scheme specified in the input CDL template).

### Purpose

-   To generate IASI L1CT BUFR granule file

-   To generate globally gridded data sets for validation and climate
    reprocessing

    -   To generate daily 0.5\*2 global grids of thinned RR and PCS
        generated from 1 band

```{=html}
<!-- -->
```
-   To generate daily 0.5\*2 global grids of thinned RR and PCS
    generated from 3 bands

-   To generate daily 0.5\*2 global grids of thinned IASI radiances.

```{=html}
<!-- -->
```
-   To generate global binary data sets for validation and to use as an
    input for the global matchups.

    -   To generate a global coverage binary file of thinned

> coverage using the 616 channel set.

### Data File Description

[]{#__RefHeading___Toc193253837 .anchor}Table 6. Thinned NetCDF File
Header

+-----------+----------------------------------------------------------+
| Data      | iasi_ncep_616\_\$YYYYMMDD_Granule-\$GGG.nc\              |
| fi        | where:\                                                  |
| le-naming | 616 = is the channel subset (i.e. 616 channels)\         |
| C         | \$YYYYMMDD = 8-digit year month day format (e.g.         |
| onvention | 20070517)\                                               |
|           | \$GGG = the 3-digit granule number (e.g. 088).  The      |
|           | granule number can go from 001 to 480                    |
+-----------+----------------------------------------------------------+
| Array     | Number_of_Dice = 660 ;      // Number dice written\      |
| dimension |        Number_of_Dots = 1 ;  // Number of IASI FOVS in a |
| variables | die\                                                     |
|           |        Number_of_IASI_Channels = 616 ;  // Number of     |
| Va        | IASI Channels\                                           |
| riables\* |        Number_of_IASI_Frequencies = 616 ;      // Number |
|           | of IASI Clear Frequencies\                               |
|           |        Number_of_AVHRR_Channels = 6;  // Number of AVHRR |
|           | channels\                                                |
|           |        Number_of_AVHRR_FOV_Classes = 7;  // Number of    |
|           | AVHRR sounder FOV classes\                               |
|           |        Number_of_AVHRR_Frequencies = 6;\                 |
|           |        Number_of_IASI_Image_Pixels = 4096; // 64 X 64    |
|           | Pixel IASI image                                         |
+-----------+----------------------------------------------------------+

\* All variables in this file are the same as for the full resolution
NetCDF file

(see Table 4).

The information about the tools a user must use to manipulate a NetCDF
file could be found at: <http://www.unidata.ucar.edu/software/netcdf/>

### Access

These files are created in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1c*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

These files are not maintained after processing.

## IASI Daily Full Global File

Global binary file for 8461 channels with the all IASI FOVs from each
FOR.

Global binary file for 15 AMSU-A channels with the all AMSU-A FOVs.

Global binary file for 5 MHS channels with the all MHS FOVs.

Global binary file for all level 2 profiles and all IASI fields of
regard.

### Purpose

These four global binary files for IASI L1C, AMSU-A, MHS, and IASI L2
are generated from the full resolution NetCDF files for their respective
instruments. These are required downstream as inputs to the Global
Matchups unit.

### Data File Description

Each of these global binary files contains exactly the same number of
records. Each record, in turn, represents all the data for a single
field of regard. Therefore, any given record number (footprint) in one
file corresponds to the same record number (footprint) in any other
file. To maintain this correspondence, missing scans/footprints, if they
occur, are added as placeholders. This correspondence is necessary for
the functionality of the matchups.

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

Each record in the file contains the data for a single IASI FOV. All the
variables are scalar values unless array length is shown. These are
direct access binary files. Below are the variables in binary file
record in the order they appear in the record:

Table 7 IASI Global Binariy Header Record Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dots                  The number of     Integer    4          1
                                  IASI FOV/FOR.                           
                                  This is always =                        
                                  4                                       

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  IASI field of                           
                                  regard clusters                         

  Number_of_IASI_Channels         The number of     Integer    4          1
                                  IASI channels                           
                                  (8461)                                  

  Number_of_AVHRR_Channels        The number of     Integer    4          1
                                  AVHRR channels                          
                                  (6)                                     

  Number_of_AVHRR_FOV_Classes     The number of     Integer    4          1
                                  AVHRR FOV classes                       
                                  (7)                                     

  IASI_Channels                   The IASI channel  Integer    4          8461
                                  numbers (1-8461)                        

  AVHRR_Channels                  The AVHRR channel Integer    4          6
                                  numbers (1-6)                           

  AVHRR_Frequencies               The AVHRR channel Real       4          6
                                  frequencies                             
                                  (cm^-1^).                               

  AVHRR_FOV_Classes               The AVHRR FOV     Integer    4          7
                                  classes (1-7)                           
  ------------------------------- ----------------- ---------- ---------- ----------

Table 8 IASI Global Binary Header Record Number 2

  ------------------ ------------------ ---------- -------------- --------------
  **Variable**       **Description**    **Type**   **Size**       **Dim Length**

  IASI_Frequencies   The IASI channel   Real       4              8461
                     frequencies (cm-1)                           
  ------------------ ------------------ ---------- -------------- --------------

Table 9 IASI Global Binary Data Record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  **The following block of                                               
  variables is repeated 4                                                
  times. Each block                                                      
  represents the data for                                                
  1 of the 4 IASI FOVs. 4                                                
  blocks constitute 1 IASI                                               
  binary data record.**                                                  

  Scan_Line                Scan line number from  Integer     4          1
                           the source granule                            

  AMSU_FOV                 The AMSU footprint     Integer     4          1
                           number (1-690) within                         
                           the granule.                                  

  IASI_FOV                 The IASI field of view Integer     4          1
                           number within the                             
                           field of regard (1-4)                         

  Latitude                 The latitudes of each  Real        4          1
                           IASI FOV (± 90                                
                           degrees).                                     

  Longitude                The longitudes of each Real        4          1
                           IASI FOV (± 180                               
                           degrees).                                     

  Footprint                The IASI field of      Integer     4          1
                           regard footprint                              
                           number (1-30) along                           
                           the scan line.                                

  View_Angle               The view angles of     Real        4          1
                           each IASI FOV (± 90                           
                           degrees).                                     

  Satellite_Height         The satellite height   Real        4          1
                           of each IASI FOV (km).                        

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of each IASI FOV (0 -                         
                           90 degrees).                                  

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of each IASI FOV                              
                           (0-180 degrees).                              

  Solar_Zenith             The solar zenith of    Real        4          1
                           each IASI FOV (0-90                           
                           degrees).                                     

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           each IASI FOV (0-180                          
                           degrees).                                     

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of each IASI                           
                           FOV (0 = ascending,                           
                           1=descending).                                

  Orbit_Number             The number of the      Integer     4          1
                           orbit (since launch)                          
                           from which the current                        
                           granule was obtained.                         

  GQisFlagQual             The QC flag of each    Integer     4          1
                           IASI FOV (0=good,                             
                           1=bad).                                       

  GQisQualIndex            The sounder spectra QC Real        4          1
                           index of each IASI                            
                           FOV.                                          

  GQisQualIndexLoc         The IASI/AVHRR         Real        4          1
                           collocation index of                          
                           each IASI FOV.                                

  GQisQualIndexRad         The radiometric QC     Real        4          1
                           flag of each IASI FOV.                        

  GQisQualIndexSpect       The spectral quality   Real        4          1
                           index of each IASI                            
                           FOV.                                          

  GQisSysTecSondQual       The sounder quality    Real        4          1
                           index of each IASI                            
                           FOV.                                          

  IASI_Radiances           The IASI radiances     Real        4          8461
                           (mW/m^2^/cm^-1^/sr).                          

  AVHRR_Mean_Radiances     The mean AVHRR         Real        4          6\*7
                           radiances                                     
                           (mW/m^2^/cm^-1^/sr).                          

  AVHRR_Std_Radiances      The standard deviation Real        4          6\*7
                           of the AVHRR radiances                        
                           (mW/m^2^/cm^-1^/sr).                          

  IASI_Image               IASI sub-pixel image   Real        4          32\*32
                           radiances                                     
                           (mW/m^2^/cm^-1^/sr).                          
  ------------------------ ---------------------- ----------- ---------- -----------

Table 10 AMSU-A Global Binary Header Record Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  AMSU-A                                  
                                  observations                            

  Number_of_AMSUA_Channels        The number of     Integer    4          1
                                  AMSUA channels                          
                                  (15)                                    

  AMSUA_Channels                  The AMSUA channel Integer    4          15
                                  numbers (1-15)                          
  ------------------------------- ----------------- ---------- ---------- ----------

Table 11 AMSU-A Global Binary Header Record Number 2

  ------------------- ----------------- ---------- ------------- -------------
  **Variable**        **Description**   **Type**   **Size**      **Dim
                                                                 Length**

  AMSUA_Frequencies   The AMSUA channel Real       4             15
                      frequencies                                
                      (cm-1)                                     
  ------------------- ----------------- ---------- ------------- -------------

Table 12 AMSU-A Global Binary Data Record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  Scan_Line                Scan line number from  Integer     4          1
                           the source granule                            

  Footprint                The AMSU footprint     Integer     4          1
                           number (1-30) along                           
                           the scan line.                                

  AMSU_FOV                 The AMSU field of view Integer     4          1
                           number within the                             
                           granule (1-690)                               

  Latitude                 The latitudes of each  Real        4          1
                           AMSU-A FOV (± 90                              
                           degrees).                                     

  Longitude                The longitudes of each Real        4          1
                           AMSU-A FOV (± 180                             
                           degrees).                                     

  View_Angle               The view angles of     Real        4          1
                           each AMSU-A FOV (± 90                         
                           degrees).                                     

  Satellite_Height         The satellite height   Real        4          1
                           of each AMSU-A FOV                            
                           (km).                                         

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of each AMSU-A FOV                            
                           (0 - 90 degrees).                             

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of each AMSU-A FOV                            
                           (0-180 degrees).                              

  Solar_Zenith             The solar zenith of    Real        4          1
                           each AMSU-A FOV (0-90                         
                           degrees).                                     

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           each AMSU-A FOV (0-180                        
                           degrees).                                     

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of each AMSU-A                         
                           FOV (0 = ascending,                           
                           1=descending).                                

  AMSUA_Radiances          The AMSU-A radiances   Real        4          15
                           (mW/m^2^/cm^-1^/sr).                          

  Quality_Flag             The AMSU-A Quality     Integer     4          15
                           Flag (0=good, else                            
                           bad).                                         
  ------------------------ ---------------------- ----------- ---------- -----------

Table 13 MHS Global Binary Header Record Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dots                  The total number  Integer    4          1
                                  of MHS FOVs with                        
                                  each data record.                       

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  MHS field of                            
                                  regard clusters.                        

  Number_of_MHS_Channels          The number of MHS Integer    4          1
                                  channels (5)                            

  MHS_Channels                    The MHS channel   Integer    4          5
                                  numbers (1-5)                           
  ------------------------------- ----------------- ---------- ---------- ----------

Table 14 MHS Global Binary Header Record Number 2

  ----------------- ------------------ ---------- ------------- -------------
  **Variable**      **Description**    **Type**   **Size**      **Dim
                                                                Length**

  MHS_Frequencies   The MHS channel    Real       4             5
                    frequencies (cm-1)                          
  ----------------- ------------------ ---------- ------------- -------------

Table 15 MHS Global Binary Data Record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  **The following block of                                               
  variables is repeated 9                                                
  times. Each block                                                      
  represents the data for                                                
  1 of the 9 MHS FOVs. 9                                                 
  blocks constitute 1 MHS                                                
  binary data record.**                                                  

  Scan_Line                MHS scan line number   Integer     4          1
                           from the source                               
                           granule (1-69)                                

  Footprint                The MHS footprint      Integer     4          1
                           number (1-90) along                           
                           the scan line.                                

  AMSU_FOV                 The AMSU field of view Integer     4          1
                           number within the                             
                           granule (1-690)                               

  MHS_FOV                  The MHS field of view  Integer     4          1
                           number within the AMSU                        
                           field of view (1-9)                           

  Latitude                 The latitudes of each  Real        4          1
                           MHS FOV (± 90                                 
                           degrees).                                     

  Longitude                The longitudes of each Real        4          1
                           MHS FOV (± 180                                
                           degrees).                                     

  View_Angle               The view angles of     Real        4          1
                           each MHS FOV (± 90                            
                           degrees).                                     

  Satellite_Height         The satellite height   Real        4          1
                           of each MHS FOV (km).                         

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of each MHS FOV (0 -                          
                           90 degrees).                                  

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of each MHS FOV (0-180                        
                           degrees).                                     

  Solar_Zenith             The solar zenith of    Real        4          1
                           each MHS FOV (0-90                            
                           degrees).                                     

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           each MHS FOV (0-180                           
                           degrees).                                     

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of each MHS FOV                        
                           (0 = ascending,                               
                           1=descending).                                

  MHS_Radiances            The MHS radiances      Real        4          5
                           (mW/m^2^/cm^-1^/sr).                          

  Quality_Flag             The MHS Quality Flag   Integer     4          5
                           (0=good, else bad).                           
  ------------------------ ---------------------- ----------- ---------- -----------

NOTE: There is only 1 IASI L2 header record....

Table 16 IASI L2 Global Binary Header Record Number 1

  -------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                     **Description**   **Type**   **Size**   **Dim
                                                                           Length**

  Actual_Number_of_Records         Total number of   Integer    4          1
                                   records in the                          
                                   file including                          
                                   the 1 header                            
                                   record                                  

  Record_Length                    Number of bytes   Integer    4          1
                                   per record                              

  Number_of_Dice                   This is the       Integer    4          1
                                   actual number of                        
                                   IASI L2                                 
                                   observations.                           

  Number_of_P_Levels               The number of     Integer    4          1
                                   pressure levels                         

  Number_of_MW_Spectral_Pts        The number of     Integer    4          1
                                   microwave                               
                                   spectral points                         

  Number_of_Surf_Emis_Hinge_Pts    The number of     Integer    4          1
                                   surface                                 
                                   emissivity hinge                        
                                   points                                  

  Number_of_Cloud_Emis_Hinge_Pts   The number of     Integer    4          1
                                   cloud emissivity                        
                                   hinge points                            

  Number_of_Cloud_Layers           The number of     Integer    4          1
                                   cloud layers                            
  -------------------------------- ----------------- ---------- ---------- ----------

Table 17 IASI L2 Global Binary Data Record

  ----------------------------------- ---------------------- ---------- ---------- ----------
  **Variable**                        **Description**        **Type**   **Size**   **Dim
                                                                                   Length**

  AMSU_FOV                            The AMSU field of view Integer    4          1
                                      number within the                            
                                      granule (1-690)                              

  Latitude                            The latitudes of each  Real       4          1
                                      IASI FOR (± 90                               
                                      degrees).                                    

  Longitude                           The longitudes of each Real       4          1
                                      IASI FOR (± 180                              
                                      degrees).                                    

  View_Angle                          The view angles of     Real       4          1
                                      each IASI FOR (± 90                          
                                      degrees).                                    

  Satellite_Height                    The satellite height   Real       4          1
                                      of each IASI FOR (km).                       

  Solar_Zenith                        The solar zenith of    Real       4          1
                                      each IASI FOR (0-90                          
                                      degrees).                                    

  Ascending_Descending                The                    Integer    4          1
                                      ascending-descending                         
                                      status of each IASI                          
                                      FOR (0 = ascending,                          
                                      1=descending).                               

  Topography                          The height of the      Real       4          1
                                      surface above sea                            
                                      level (meters).                              

  Land_Fraction                       The fraction of land   Real       4          1
                                      coverage (0-1).                              

  Surface_Pressure                    Surface pressure in    Real       4          1
                                      millibars.                                   

  Skin_Temperature                    Skin temperature in    Real       4          1
                                      Kelvin.                                      

  Mean_CO~2~                          Mean CO~2~ in ppm.     Real       4          1

  MW_Surface_Class                    Microwave surface      Integer    4          1
                                      class.                                       

  MW_Surface_Emis                     Microwave surface      Real       4          1
                                      emissivity.                                  

  Bottom_Level_Index                  The index of the       Integer    4          1
                                      pressure array that                          
                                      marks the pressure at                        
                                      the surface.                                 

  N_Smw_Per_FOV                       The number of          Integer    4          1
                                      microwave spectral                           
                                      points within each                           
                                      layer                                        

  nemis_Per_FOV                       The number of surface  Integer    4          1
                                      emissivity hinge                             
                                      points within each                           
                                      layer                                        

  ncemis_Per_FOV                      The number of cloud    Integer    4          1
                                      emssivity hinge points                       
                                      within each layer                            

  ncld_Per_FOV                        The number of cloud    Integer    4          1
                                      layers points within                         
                                      each layer                                   

  Quality_Flag                        Retrieval quality flag Integer    4          1
                                      (0=accept, 1=reject).                        

  **The following block of 2                                                       
  variables is repeated                                                            
  Number_of_Cloud_Layers (nominally                                                
  8) times. The user of these data                                                 
  must check the header to obtain the                                              
  value of Number_of_Cloud_Layers.**                                               

  Cloud_Top_Pressure                  Cloud top pressure in  Real       4          1
                                      millibars.                                   

  Cloud_Top_Fraction                  Cloud top fractional   Real       4          1
                                      coverage (0-1).                              

  **The following block of 12                                                      
  variables is repeated                                                            
  Number_of_P_Levels (nominally 100)                                               
  times. The user of these data must                                               
  check the header to obtain the                                                   
  value of Number_of_P_Levels.**                                                   

  Pressure                            Pressure with the      Real       4          1
                                      current layer in                             
                                      millibars.                                   

  Temperature                         Temperature within the Real       4          1
                                      current layer in                             
                                      Kelvin                                       

  H~2~O                               H~2~O layer column     Real       4          1
                                      density.                                     

  O~3~                                O~3~ layer column      Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  Liquid_H~2~O                        Liquid H~2~O layer     Real       4          1
                                      column density                               
                                      (molecules/cm^2^).                           

  Ice_Liquid_Flag                     Ice liquid flag        Integer    4          1
                                      (0=water, 1=ice).                            

  CO                                  O~3~ layer column      Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  CH~4~                               O~3~ layer column      Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  CO~2~                               CO~2~ mixing ratio     Real       4          1
                                      (ppm).                                       

  N~2~O                               N~2~O layer column     Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  SO~2~                               SO~2~ layer column     Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  HNO~3~                              HNO~3~ layer column    Real       4          1
                                      density                                      
                                      (molecules/cm^2^).                           

  **The following block of 2                                                       
  variables is repeated                                                            
  Number_of_MW_Spectral_Pts                                                        
  (nominally 16) times. The user of                                                
  these data must check the header to                                              
  obtain the value of                                                              
  Number_of_MW_Spectral_Pts.**                                                     

  MW_Frequency                        Microwave frequency    Real       4          1
                                      (cm^-1^).                                    

  MW_Emis                             Microwave emissivity.  Real       4          1

  **The following block of 3                                                       
  variables is repeated                                                            
  Number_of_Surf_Emis_Hinge_Pts                                                    
  (nominally 100) times. The user of                                               
  these data must check the header to                                              
  obtain the value of                                                              
  Number_of_Surf_Emis_Hinge_Pts.**                                                 

  IR_Emis_Freq                        Infrared emissivity    Real       4          1
                                      hinge point                                  
                                      frequencies (cm^-1^).                        

  IR_Surface_Emis                     Infrared surface       Real       4          1
                                      emissivity                                   

  IR_Surface_Refl                     Infrared surface       Real       4          1
                                      reflectances                                 
                                      (percent).                                   

  **The following block of 3                                                       
  variables is repeated                                                            
  Number_of_Cloud_Emis_Hinge_Pts                                                   
  (nominally 100) times. The user of                                               
  these data must check the header to                                              
  obtain the value of                                                              
  Number_of_Cloud_Emis_Hinge_Pts.**                                                

  **The following block of 3                                                       
  variables is repeated                                                            
  Number_of_Cloud_Layers (nominally                                                
  8) times. The user of these data                                                 
  must check the header to obtain the                                              
  value of Number_of_Cloud_Layers.**                                               

  Cloud_Freq                          Cloud infrared         Real       4          1
                                      frequencies (cm^-1^).                        

  Cloud_Refl                          Cloud infrared         Real       4          1
                                      reflectivity.                                

  Cloud_Emis                          Cloud infrared         Real       4          1
                                      emissivity.                                  
  ----------------------------------- ---------------------- ---------- ---------- ----------

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------

[]{#__RefHeading___Toc193253463 .anchor}Access

Global binary file for 8461 channels with the all IASI FOVs from each
FOR resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/FullRes_Global_Binaries/iasi_all_8461\_\${Year}\${Month}\${Day}.binary*

Global binary file for 15 AMSU-A channels with the all AMSU-A FOVs
resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/AMSUA_Global_Binaries/amsua_all_fov_all_chan\_\${Year}\${Month}\${Day}.binary*

Global binary file for 5 MHS channels with the all MHS FOVs resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/MHS_Global_Binaries/mhs_all_fov_all_chan\_\${Year}\${Month}\${Day}.binary*

Global binary file for all level 2 profiles and all IASI fields of
regard resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/L2_Global_Binaries/iasi_l2\_\${Year}\${Month}\${Day}.binary*

These files are not maintained after the processing.

##  Daily Full Global Location Files

IASI single daily full global coverage binary file containing only the
locations and times of all FOVs from each FOR.

AMSU-A single daily full global binary file containing only the
locations and times of all FOVs from each FOR.

MHS single daily full global binary file containing only the locations
and times of all FOVs from each FOR.

Global binary file containing only the locations and times of all FOVs
from each FOR

### Purpose

These files are used for the matchup processing.

### Data File Description

These are direct access binary files. These files have only 3 variables:

Time

Latitude

Longitude

These files have four records header, the same as for the full global
binary files.

### Access

IASI single daily full global coverage binary file containing only the
locations and times of all FOVs from each FOR resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/FullRes_Global_Binaries/iasi_all_8461\_\${Year}\${Month}\${Day}\_locs.binary*

AMSU-A single daily full global binary file containing only the
locations and times of all FOVs from each FOR resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/AMSUA_Global_Binaries/amsua_all_fov_all_chan\_\${Year}\${Month}\${Day}\_locs.binary*

MHS single daily full global binary file containing only the locations
and times of all FOVs from each FOR resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/MHS_Global_Binaries/mhs_all_fov_all_chan\_\${Year}\${Month}\${Day}\_locs.binary*

Global binary file containing only the locations and times of all FOVs
from each FOR resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/L2_Global_Binaries/iasi_l2\_\${Year}\${Month}\${Day}\_locs.binary*

These files are not maintained after the processing.

## AMSU-A Level 1B NetCDF Granule Files 

### Purpose

These files are converted to the retrieval input binary format in the
L1B Processing unit. Therefore, they are indirectly needed by the L2
Processing Unit. These files are also used directly in the Global Grids
and Global Binaries Units.

### Data File Description

The following NetCDF file is produced for each granule with the
following name structure.

amsua_all_fov_all_chan\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

where:

\$Year = 4-digit year

\$Month = 2-digit month

\$Day = 2-digit day

\$Granule_Number = 3-digit granule number

This is full spatial and spectral resolution file. Its starting and
ending scan lines and footprints match those of the full resolution IASI
Level 1C NetCDF files for the same granule number described above.

Table 18 AMSU-A Level 1B Net CDF File Header

+---------+------------------------------------------------------------+
| dime    | Number_of_AMSU_FOVs = 660 ; // Number FOV written per      |
| nsions: | granule                                                    |
|         |                                                            |
| var     | Number_of_AMSUA_Channels = 15 ; // Total number of AMSU-A  |
| iables: | Channels                                                   |
|         |                                                            |
|         | Number_of_AMSUA_Frequencies = 15 ; // Total number of      |
|         | AMSU-A Frequencies                                         |
|         |                                                            |
|         | long AMSUA_Channels(Number_of_AMSUA_Channels) ;            |
|         |                                                            |
|         | AMSUA_Channels:long_name = \"Channel number for data\" ;   |
|         |                                                            |
|         | AMSUA_Channels:units = \"none\" ;                          |
|         |                                                            |
|         | AMSUA_Channels:scale_factor = 1.0d ;                       |
|         |                                                            |
|         | AMSUA_Channels:add_offset = 0.0d ;                         |
|         |                                                            |
|         | AMSUA_Channels:parameter_type = \"AMSUA data\" ;           |
|         |                                                            |
|         | AMSUA_Channels:valid_range = 1.0f, 15.0f ;                 |
|         |                                                            |
|         | AMSUA_Channels:\_FillValue = -9999 ;                       |
|         |                                                            |
|         | float AMSUA_Frequencies(Number_of_AMSUA_Frequencies) ;     |
|         |                                                            |
|         | AMSUA_Frequencies:long_name = \"Frequency at which the     |
|         | data is taken\" ;                                          |
|         |                                                            |
|         | AMSUA_Frequencies:units = \"wavenumber cm-1\" ;            |
|         |                                                            |
|         | AMSUA_Frequencies:scale_factor = 1.0d ;                    |
|         |                                                            |
|         | AMSUA_Frequencies:add_offset = 0.0d ;                      |
|         |                                                            |
|         | AMSUA_Frequencies:parameter_type = \"AMSUA data\" ;        |
|         |                                                            |
|         | AMSUA_Frequencies:valid_range = 0.0f, 10000.0f ;           |
|         |                                                            |
|         | AMSUA_Frequencies:\_FillValue = -9999.0f ;                 |
|         |                                                            |
|         | long AMSU_FOV(Number_of_AMSU_FOVs) ;                       |
|         |                                                            |
|         | AMSU_FOV:long_name = \"The index of the AMSU FOV in the    |
|         | granule\" ;                                                |
|         |                                                            |
|         | AMSU_FOV:units = \"none\" ;                                |
|         |                                                            |
|         | AMSU_FOV:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | AMSU_FOV:add_offset = 0.0d ;                               |
|         |                                                            |
|         | AMSU_FOV:parameter_type = \"AMSUA data\" ;                 |
|         |                                                            |
|         | AMSU_FOV:valid_range = 1.0f, 660.0f ;                      |
|         |                                                            |
|         | AMSU_FOV:\_FillValue = -9999 ;                             |
|         |                                                            |
|         | long Scan_Line(Number_of_AMSU_FOVs) ;                      |
|         |                                                            |
|         | Scan_Line:long_name = \"The number of the current scan     |
|         | line\" ;                                                   |
|         |                                                            |
|         | Scan_Line:units = \"none\" ;                               |
|         |                                                            |
|         | Scan_Line:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Scan_Line:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Scan_Line:parameter_type = \"AMSUA data\" ;                |
|         |                                                            |
|         | Scan_Line:valid_range = 1.0f, 22.0f ;                      |
|         |                                                            |
|         | Scan_Line:\_FillValue = -9999 ;                            |
|         |                                                            |
|         | long Footprint(Number_of_AMSU_FOVs) ;                      |
|         |                                                            |
|         | Footprint:long_name = \"The number of the current AMSU FOV |
|         | on the scan line\" ;                                       |
|         |                                                            |
|         | Footprint:units = \"none\" ;                               |
|         |                                                            |
|         | Footprint:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Footprint:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Footprint:parameter_type = \"AMSUA data\" ;                |
|         |                                                            |
|         | Footprint:valid_range = 1.0f, 30.0f ;                      |
|         |                                                            |
|         | Footprint:\_FillValue = -9999 ;                            |
|         |                                                            |
|         | double Time(Number_of_AMSU_FOVs) ;                         |
|         |                                                            |
|         | Time:long_name = \"UTC Milliseconds since Jan 1, 1970\" ;  |
|         |                                                            |
|         | Time:units = \"msec\" ;                                    |
|         |                                                            |
|         | Time:scale_factor = 1.0d ;                                 |
|         |                                                            |
|         | Time:add_offset = 0.0d ;                                   |
|         |                                                            |
|         | Time:parameter_type = \"AMSUA data\" ;                     |
|         |                                                            |
|         | Time:valid_range = 0.0f, 1577836800000.0f ;                |
|         |                                                            |
|         | Time:\_FillValue = -9999.0 ;                               |
|         |                                                            |
|         | float Latitude(Number_of_AMSU_FOVs) ;                      |
|         |                                                            |
|         | Latitude:long_name = \"AMSUA Latitude values for each      |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Latitude:units = \"degrees North\" ;                       |
|         |                                                            |
|         | Latitude:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | Latitude:add_offset = 0.0d ;                               |
|         |                                                            |
|         | Latitude:parameter_type = \"AMSUA data\" ;                 |
|         |                                                            |
|         | Latitude:valid_range = 90.0f, -90.0f ;                     |
|         |                                                            |
|         | Latitude:\_FillValue = -9999.0f ;                          |
|         |                                                            |
|         | float Longitude(Number_of_AMSU_FOVs) ;                     |
|         |                                                            |
|         | Longitude:long_name = \"AMSUA Longitude values for each    |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Longitude:units = \"degrees East\" ;                       |
|         |                                                            |
|         | Longitude:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Longitude:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Longitude:parameter_type = \"AMSUA data\" ;                |
|         |                                                            |
|         | Longitude:valid_range = -180.0f, 179.99f ;                 |
|         |                                                            |
|         | Longitude:\_FillValue = -9999.0f ;                         |
|         |                                                            |
|         | float                                                      |
|         | AMS                                                        |
|         | UA_Radiances(Number_of_AMSU_FOVs,Number_of_AMSUA_Channels) |
|         | ;                                                          |
|         |                                                            |
|         | AMSUA_Radiances:long_name = \"AMSUA Radiances for each     |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | AMSUA_Radiances:units = \"mW/m2/cm-1/sr\" ;                |
|         |                                                            |
|         | AMSUA_Radiances:scale_factor = 1.0d ;                      |
|         |                                                            |
|         | AMSUA_Radiances:add_offset = 0.0d ;                        |
|         |                                                            |
|         | AMSUA_Radiances:parameter_type = \"AMSUA data\" ;          |
|         |                                                            |
|         | AMSUA_Radiances:valid_range = 0.0f, 40000.0f ;             |
|         |                                                            |
|         | AMSUA_Radiances:\_FillValue = -9999.0f ;                   |
|         |                                                            |
|         | short                                                      |
|         | Quality_Flag(Number_of_AMSU_FOVs,Number_of_AMSUA_Channels) |
|         | ;                                                          |
|         |                                                            |
|         | Quality_Flag:long_name = \"AMSUA Quality_Flag for each     |
|         | channel per FOV\" ;                                        |
|         |                                                            |
|         | Quality_Flag:units = \"none\" ;                            |
|         |                                                            |
|         | Quality_Flag:scale_factor = 1 ;                            |
|         |                                                            |
|         | Quality_Flag:add_offset = 0 ;                              |
|         |                                                            |
|         | Quality_Flag:parameter_type = \"AMSUA data\" ;             |
|         |                                                            |
|         | Quality_Flag:valid_range = 0, 1 ;                          |
|         |                                                            |
|         | Quality_Flag:\_FillValue = -9999s ;                        |
|         |                                                            |
|         | float View_Angle(Number_of_AMSU_FOVs) ;                    |
|         |                                                            |
|         | View_Angle:long_name = \"AMSUA View Angles for each FOV\"  |
|         | ;                                                          |
|         |                                                            |
|         | View_Angle:units = \"degrees\" ;                           |
|         |                                                            |
|         | View_Angle:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | View_Angle:add_offset = 0.0d ;                             |
|         |                                                            |
|         | View_Angle:parameter_type = \"AMSUA data\" ;               |
|         |                                                            |
|         | View_Angle:valid_range = -90.0f, 90.0f ;                   |
|         |                                                            |
|         | View_Angle:\_FillValue = -9999.0f ;                        |
|         |                                                            |
|         | float Satellite_Height(Number_of_AMSU_FOVs) ;              |
|         |                                                            |
|         | Satellite_Height:long_name = \"Satellite height above each |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Satellite_Height:units = \"km\" ;                          |
|         |                                                            |
|         | Satellite_Height:scale_factor = 1.0 ;                      |
|         |                                                            |
|         | Satellite_Height:add_offset = 0.0 ;                        |
|         |                                                            |
|         | Satellite_Height:parameter_type = \"AMSUA data\" ;         |
|         |                                                            |
|         | Satellite_Height:valid_range = 0.0f, 1000.0f ;             |
|         |                                                            |
|         | Satellite_Height:\_FillValue = -9999.0f ;                  |
|         |                                                            |
|         | float Satellite_Zenith(Number_of_AMSU_FOVs) ;              |
|         |                                                            |
|         | Satellite_Zenith:long_name = \"Satellite zenith angles for |
|         | each FOV\" ;                                               |
|         |                                                            |
|         | Satellite_Zenith:units = \"degrees\" ;                     |
|         |                                                            |
|         | Satellite_Zenith:scale_factor = 1.0 ;                      |
|         |                                                            |
|         | Satellite_Zenith:add_offset = 0.0 ;                        |
|         |                                                            |
|         | Satellite_Zenith:parameter_type = \"AMSUA data\" ;         |
|         |                                                            |
|         | Satellite_Zenith:valid_range = 0.0f, 90.0f ;               |
|         |                                                            |
|         | Satellite_Zenith:\_FillValue = -9999.0f ;                  |
|         |                                                            |
|         | float Satellite_Azimuth(Number_of_AMSU_FOVs) ;             |
|         |                                                            |
|         | Satellite_Azimuth:long_name = \"Satellite azimuth angles   |
|         | for each FOV\" ;                                           |
|         |                                                            |
|         | Satellite_Azimuth:units = \"degrees\" ;                    |
|         |                                                            |
|         | Satellite_Azimuth:scale_factor = 1.0 ;                     |
|         |                                                            |
|         | Satellite_Azimuth:add_offset = 0.0 ;                       |
|         |                                                            |
|         | Satellite_Azimuth:parameter_type = \"AMSUA data\" ;        |
|         |                                                            |
|         | Satellite_Azimuth:valid_range = 0.0f, 180.0f ;             |
|         |                                                            |
|         | Satellite_Azimuth:\_FillValue = -9999.0f ;                 |
|         |                                                            |
|         | float Solar_Zenith(Number_of_AMSU_FOVs) ;                  |
|         |                                                            |
|         | Solar_Zenith:long_name = \"Solar zenith angles for each    |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Solar_Zenith:units = \"degrees\" ;                         |
|         |                                                            |
|         | Solar_Zenith:scale_factor = 1.0 ;                          |
|         |                                                            |
|         | Solar_Zenith:add_offset = 0.0 ;                            |
|         |                                                            |
|         | Solar_Zenith:parameter_type = \"AMSUA data\" ;             |
|         |                                                            |
|         | Solar_Zenith:valid_range = 0.f, 90.f ;                     |
|         |                                                            |
|         | Solar_Zenith:\_FillValue = -9999.f ;                       |
|         |                                                            |
|         | float Solar_Azimuth(Number_of_AMSU_FOVs) ;                 |
|         |                                                            |
|         | Solar_Azimuth:long_name = \"Solar azimuth angles for each  |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Solar_Azimuth:units = \"degrees\" ;                        |
|         |                                                            |
|         | Solar_Azimuth:scale_factor = 1.0 ;                         |
|         |                                                            |
|         | Solar_Azimuth:add_offset = 0.0 ;                           |
|         |                                                            |
|         | Solar_Azimuth:parameter_type = \"AMSUA data\" ;            |
|         |                                                            |
|         | Solar_Azimuth:valid_range = 0.f, 180.f ;                   |
|         |                                                            |
|         | Solar_Azimuth:\_FillValue = -9999.f ;                      |
|         |                                                            |
|         | short Ascending_Descending(Number_of_AMSU_FOVs) ;          |
|         |                                                            |
|         | Ascending_Descending:long_name = \"0=Descending,           |
|         | 1=Ascending\" ;                                            |
|         |                                                            |
|         | Ascending_Descending:units = \"none\" ;                    |
|         |                                                            |
|         | Ascending_Descending:scale_factor = 1 ;                    |
|         |                                                            |
|         | Ascending_Descending:add_offset = 0 ;                      |
|         |                                                            |
|         | Ascending_Descending:parameter_type = \"AMSUA data\" ;     |
|         |                                                            |
|         | Ascending_Descending:valid_range = 0, 1 ;                  |
|         |                                                            |
|         | Ascending_Descending:\_FillValue = -9999s ;                |
+---------+------------------------------------------------------------+

### Access

The AMSU-A Level 1B NetCDF granule files are generated from
*main_amsua_level1b*. The input files are the NOAA Level 1B orbital
files. This program is part of the L1B Processing Unit. These files are
created in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1b*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

##  *MHS Level 1B NetCDF Granule Files*

### Purpose

These files are converted to the retrieval input binary format in the
L1B Processing unit. Therefore, they are indirectly needed by the L2
Processing Unit. These files are also used directly in the Global Grids
and Global Binaries Units.

### Data File Description

The following NetCDF files are produced for each granule with the
following name structure.

mhs_all_fov_all_chan\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

where:

\$Year = 4-digit year

\$Month = 2-digit month

\$Day = 2-digit day

\$Granule_Number = 3-digit granule number

These are full spatial and spectral resolution files. Their starting and
ending scan lines and footprints match those of the full resolution IASI
Level 1C NetCDF files for the same granule number described above.

Table 19 MHS Level 1B NetCDF File Header

+---------+------------------------------------------------------------+
| dime    | Number_of_AMSU_FOVs = 660 ; // Number AMSU FOVs written    |
| nsions: | per granule                                                |
|         |                                                            |
| var     | Number_of_MHS_FOVs = 9 ; // Number of MHS FOVs per AMSU    |
| iables: | FOV                                                        |
|         |                                                            |
|         | Number_of_MHS_Channels = 5 ; // Total number of MHS        |
|         | Channels                                                   |
|         |                                                            |
|         | Number_of_MHS_Frequencies = 5 ; // Total number of MHS     |
|         | Frequencies                                                |
|         |                                                            |
|         | long MHS_Channels(Number_of_MHS_Channels) ;                |
|         |                                                            |
|         | MHS_Channels:long_name = \"Channel number for data\" ;     |
|         |                                                            |
|         | MHS_Channels:units = \"none\" ;                            |
|         |                                                            |
|         | MHS_Channels:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | MHS_Channels:add_offset = 0.0d ;                           |
|         |                                                            |
|         | MHS_Channels:parameter_type = \"MHS data\" ;               |
|         |                                                            |
|         | MHS_Channels:valid_range = 1.0f, 5.0f ;                    |
|         |                                                            |
|         | MHS_Channels:\_FillValue = -9999 ;                         |
|         |                                                            |
|         | float MHS_Frequencies(Number_of_MHS_Frequencies) ;         |
|         |                                                            |
|         | MHS_Frequencies:long_name = \"Frequency at which the data  |
|         | is taken\" ;                                               |
|         |                                                            |
|         | MHS_Frequencies:units = \"wavenumber cm-1\" ;              |
|         |                                                            |
|         | MHS_Frequencies:scale_factor = 1.0d ;                      |
|         |                                                            |
|         | MHS_Frequencies:add_offset = 0.0d ;                        |
|         |                                                            |
|         | MHS_Frequencies:parameter_type = \"MHS data\" ;            |
|         |                                                            |
|         | MHS_Frequencies:valid_range = 0.0f, 10000.0f ;             |
|         |                                                            |
|         | MHS_Frequencies:\_FillValue = -9999.0f ;                   |
|         |                                                            |
|         | long MHS_FOV(Number_of_MHS_FOVs) ;                         |
|         |                                                            |
|         | MHS_FOV:long_name = \"The index of the MHS FOV in the AMSU |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | MHS_FOV:units = \"none\" ;                                 |
|         |                                                            |
|         | MHS_FOV:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | MHS_FOV:add_offset = 0.0d ;                                |
|         |                                                            |
|         | MHS_FOV:parameter_type = \"MHS data\" ;                    |
|         |                                                            |
|         | MHS_FOV:valid_range = 1.0f, 9.0f ;                         |
|         |                                                            |
|         | MHS_FOV:\_FillValue = -9999 ;                              |
|         |                                                            |
|         | long AMSU_FOV(Number_of_AMSU_FOVs) ;                       |
|         |                                                            |
|         | AMSU_FOV:long_name = \"The index of the AMSU FOV in the    |
|         | granule\" ;                                                |
|         |                                                            |
|         | AMSU_FOV:units = \"none\" ;                                |
|         |                                                            |
|         | AMSU_FOV:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | AMSU_FOV:add_offset = 0.0d ;                               |
|         |                                                            |
|         | AMSU_FOV:parameter_type = \"AMSU data\" ;                  |
|         |                                                            |
|         | AMSU_FOV:valid_range = 1.0f, 660.0f ;                      |
|         |                                                            |
|         | AMSU_FOV:\_FillValue = -9999 ;                             |
|         |                                                            |
|         | long Scan_Line(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;   |
|         |                                                            |
|         | Scan_Line:long_name = \"The number of the current MHS scan |
|         | line\" ;                                                   |
|         |                                                            |
|         | Scan_Line:units = \"none\" ;                               |
|         |                                                            |
|         | Scan_Line:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Scan_Line:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Scan_Line:parameter_type = \"MHS data\" ;                  |
|         |                                                            |
|         | Scan_Line:valid_range = 1.0f, 66.0f ;                      |
|         |                                                            |
|         | Scan_Line:\_FillValue = -9999 ;                            |
|         |                                                            |
|         | long Footprint(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;   |
|         |                                                            |
|         | Footprint:long_name = \"The number of the current MHS FOV  |
|         | on the scan line\" ;                                       |
|         |                                                            |
|         | Footprint:units = \"none\" ;                               |
|         |                                                            |
|         | Footprint:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Footprint:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Footprint:parameter_type = \"AMSUA data\" ;                |
|         |                                                            |
|         | Footprint:valid_range = 1.0f, 90.0f ;                      |
|         |                                                            |
|         | Footprint:\_FillValue = -9999 ;                            |
|         |                                                            |
|         | double Time(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;      |
|         |                                                            |
|         | Time:long_name = \"UTC Milliseconds since Jan 1, 1970\" ;  |
|         |                                                            |
|         | Time:units = \"msec\" ;                                    |
|         |                                                            |
|         | Time:scale_factor = 1.0d ;                                 |
|         |                                                            |
|         | Time:add_offset = 0.0d ;                                   |
|         |                                                            |
|         | Time:parameter_type = \"MHS data\" ;                       |
|         |                                                            |
|         | Time:valid_range = 0.0f, 1577836800000.0f ;                |
|         |                                                            |
|         | Time:\_FillValue = -9999.0 ;                               |
|         |                                                            |
|         | float Latitude(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;   |
|         |                                                            |
|         | Latitude:long_name = \"MHS Latitude values for each MHS    |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Latitude:units = \"degrees North\" ;                       |
|         |                                                            |
|         | Latitude:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | Latitude:add_offset = 0.0d ;                               |
|         |                                                            |
|         | Latitude:parameter_type = \"MHS data\" ;                   |
|         |                                                            |
|         | Latitude:valid_range = 90.0f, -90.0f ;                     |
|         |                                                            |
|         | Latitude:\_FillValue = -9999.0f ;                          |
|         |                                                            |
|         | float Longitude(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;  |
|         |                                                            |
|         | Longitude:long_name = \"MHS Longitude values for each MHS  |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | Longitude:units = \"degrees East\" ;                       |
|         |                                                            |
|         | Longitude:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Longitude:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Longitude:parameter_type = \"MHS data\" ;                  |
|         |                                                            |
|         | Longitude:valid_range = -180.0f, 179.99f ;                 |
|         |                                                            |
|         | Longitude:\_FillValue = -9999.0f ;                         |
|         |                                                            |
|         | float                                                      |
|         | MHS_Radiances(Numb                                         |
|         | er_of_AMSU_FOVs,Number_of_MHS_FOVs,Number_of_MHS_Channels) |
|         | ;                                                          |
|         |                                                            |
|         | MHS_Radiances:long_name = \"MHS Radiances for each MHS     |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | MHS_Radiances:units = \"mW/m2/cm-1/sr\" ;                  |
|         |                                                            |
|         | MHS_Radiances:scale_factor = 1.0d ;                        |
|         |                                                            |
|         | MHS_Radiances:add_offset = 0.0d ;                          |
|         |                                                            |
|         | MHS_Radiances:parameter_type = \"MHS data\" ;              |
|         |                                                            |
|         | MHS_Radiances:valid_range = 0.0f, 40000.0f ;               |
|         |                                                            |
|         | MHS_Radiances:\_FillValue = -9999.0f ;                     |
|         |                                                            |
|         | short                                                      |
|         | Quality_Flag(Numb                                          |
|         | er_of_AMSU_FOVs,Number_of_MHS_FOVs,Number_of_MHS_Channels) |
|         | ;                                                          |
|         |                                                            |
|         | Quality_Flag:long_name = \"MHS Quality_Flag for each       |
|         | channel per MHS FOV\" ;                                    |
|         |                                                            |
|         | Quality_Flag:units = \"none\" ;                            |
|         |                                                            |
|         | Quality_Flag:scale_factor = 1 ;                            |
|         |                                                            |
|         | Quality_Flag:add_offset = 0 ;                              |
|         |                                                            |
|         | Quality_Flag:parameter_type = \"MHS data\" ;               |
|         |                                                            |
|         | Quality_Flag:valid_range = 0, 1 ;                          |
|         |                                                            |
|         | Quality_Flag:\_FillValue = -9999s ;                        |
|         |                                                            |
|         | float View_Angle(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ; |
|         |                                                            |
|         | View_Angle:long_name = \"MHS View Angles for each MHS      |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | View_Angle:units = \"degrees\" ;                           |
|         |                                                            |
|         | View_Angle:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | View_Angle:add_offset = 0.0d ;                             |
|         |                                                            |
|         | View_Angle:parameter_type = \"MHS data\" ;                 |
|         |                                                            |
|         | View_Angle:valid_range = -90.0f, 90.0f ;                   |
|         |                                                            |
|         | View_Angle:\_FillValue = -9999.0f ;                        |
|         |                                                            |
|         | float                                                      |
|         | Satellite_Height(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ; |
|         |                                                            |
|         | Satellite_Height:long_name = \"Satellite height above each |
|         | MHS FOV\" ;                                                |
|         |                                                            |
|         | Satellite_Height:units = \"km\" ;                          |
|         |                                                            |
|         | Satellite_Height:scale_factor = 1.0 ;                      |
|         |                                                            |
|         | Satellite_Height:add_offset = 0.0 ;                        |
|         |                                                            |
|         | Satellite_Height:parameter_type = \"MHS data\" ;           |
|         |                                                            |
|         | Satellite_Height:valid_range = 0.0f, 1000.0f ;             |
|         |                                                            |
|         | Satellite_Height:\_FillValue = -9999.0f ;                  |
|         |                                                            |
|         | float                                                      |
|         | Satellite_Zenith(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ; |
|         |                                                            |
|         | Satellite_Zenith:long_name = \"Satellite zenith angles for |
|         | each MHS FOV\" ;                                           |
|         |                                                            |
|         | Satellite_Zenith:units = \"degrees\" ;                     |
|         |                                                            |
|         | Satellite_Zenith:scale_factor = 1.0 ;                      |
|         |                                                            |
|         | Satellite_Zenith:add_offset = 0.0 ;                        |
|         |                                                            |
|         | Satellite_Zenith:parameter_type = \"MHS data\" ;           |
|         |                                                            |
|         | Satellite_Zenith:valid_range = 0.0f, 90.0f ;               |
|         |                                                            |
|         | Satellite_Zenith:\_FillValue = -9999.0f ;                  |
|         |                                                            |
|         | float                                                      |
|         | Satellite_Azimuth(Number_of_AMSU_FOVs,Number_of_MHS_FOVs)  |
|         | ;                                                          |
|         |                                                            |
|         | Satellite_Azimuth:long_name = \"Satellite azimuth angles   |
|         | for each MHS FOV\" ;                                       |
|         |                                                            |
|         | Satellite_Azimuth:units = \"degrees\" ;                    |
|         |                                                            |
|         | Satellite_Azimuth:scale_factor = 1.0 ;                     |
|         |                                                            |
|         | Satellite_Azimuth:add_offset = 0.0 ;                       |
|         |                                                            |
|         | Satellite_Azimuth:parameter_type = \"MHS data\" ;          |
|         |                                                            |
|         | Satellite_Azimuth:valid_range = 0.0f, 180.0f ;             |
|         |                                                            |
|         | Satellite_Azimuth:\_FillValue = -9999.0f ;                 |
|         |                                                            |
|         | float Solar_Zenith(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) |
|         | ;                                                          |
|         |                                                            |
|         | Solar_Zenith:long_name = \"Solar zenith angles for each    |
|         | MHS FOV\" ;                                                |
|         |                                                            |
|         | Solar_Zenith:units = \"degrees\" ;                         |
|         |                                                            |
|         | Solar_Zenith:scale_factor = 1.0 ;                          |
|         |                                                            |
|         | Solar_Zenith:add_offset = 0.0 ;                            |
|         |                                                            |
|         | Solar_Zenith:parameter_type = \"MHS data\" ;               |
|         |                                                            |
|         | Solar_Zenith:valid_range = 0.f, 90.f ;                     |
|         |                                                            |
|         | Solar_Zenith:\_FillValue = -9999.f ;                       |
|         |                                                            |
|         | float                                                      |
|         | Solar_Azimuth(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) ;    |
|         |                                                            |
|         | Solar_Azimuth:long_name = \"Solar azimuth angles for each  |
|         | MHS FOV\" ;                                                |
|         |                                                            |
|         | Solar_Azimuth:units = \"degrees\" ;                        |
|         |                                                            |
|         | Solar_Azimuth:scale_factor = 1.0 ;                         |
|         |                                                            |
|         | Solar_Azimuth:add_offset = 0.0 ;                           |
|         |                                                            |
|         | Solar_Azimuth:parameter_type = \"MHS data\" ;              |
|         |                                                            |
|         | Solar_Azimuth:valid_range = 0.f, 180.f ;                   |
|         |                                                            |
|         | Solar_Azimuth:\_FillValue = -9999.f ;                      |
|         |                                                            |
|         | short                                                      |
|         | As                                                         |
|         | cending_Descending(Number_of_AMSU_FOVs,Number_of_MHS_FOVs) |
|         | ;                                                          |
|         |                                                            |
|         | Ascending_Descending:long_name = \"0=Descending,           |
|         | 1=Ascending\" ;                                            |
|         |                                                            |
|         | Ascending_Descending:units = \"none\" ;                    |
|         |                                                            |
|         | Ascending_Descending:scale_factor = 1 ;                    |
|         |                                                            |
|         | Ascending_Descending:add_offset = 0 ;                      |
|         |                                                            |
|         | Ascending_Descending:parameter_type = \"MHS data\" ;       |
|         |                                                            |
|         | Ascending_Descending:valid_range = 0, 1 ;                  |
|         |                                                            |
|         | Ascending_Descending:\_FillValue = -9999s ;                |
+---------+------------------------------------------------------------+

### Access

The AMSU-A and MHS Level 1B NetCDF granule files are generated from
*main_mhs_level1b*. The input files are the NOAA Level 1B orbital files.
This program is part of the L1B Processing Unit. These files are created
in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1b*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

##  **Retrieval Input/Output Files**

### Purpose

These are purely intermediate files which are not distributed to any
users. The retrieval input format files are used in L2 Retrieval
Processing Unit (see Figures 2 and 6). Retrieval output files are used
in the same unit to generate L2 and CCR NetCDF files.

### Data File Description

There are five input files required by the retrieval. These are all
binary sequential access files for IASI L1C, AMSU-A, MHS, and GFS
surface pressure.

These files have the following name structures and are stored in the
following subdirectories, respectively:

*/level1c/iasi_all_8461\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.binary*

*/level1b/amsua_all_fov_all_chan\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.binary*

*/level1b/mhs_all_fov_all_chan\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.binary*

*/level2/avntest\_\${Year}\${Month}\${Day}\_\${Granule_Number}.bin*

*/level2/avntest\_\${Year}\${Month}\${Day}\_\${Granule_Number}b.bin*

There are a number of retrieval output files which are generated in the
level2 directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.ccr*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.f61*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.f69*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.ret*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_iasi_l2_retrieval.bin*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_iasi_l2_retrieval.f70*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_iasi_l2_retrieval.f95*

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_iasi_l2_retrieval.out*

The retrieval profile output is located in:

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.ret*

This file contains retrievals of temperature, moisture, and trace gases.
The CCR file is:

*\${Year}\${Month}\${Day}\_\${Granule_Number}\_bin_0002.ccr*

These radiances are identical to the original IASI radiance except the
effects of clouds have been removed.

All the other files are diagnostic files and are therefore not used for
any products downstream.

### Access

Retrieval input/output files could be found in following directories:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

##   {#section .unnumbered}

##  {#section-1 .unnumbered}

# Output Data Sets

Output datasets are described in this section. To get a sense of where
these files fit within the IASI PPS, the reader is referred to section
1, Figures 1-10. Table 19 (a, b, c) provides a summary description of
the output files including their source, data and product type,
contents, time period, resolution, spectral and spatial subsets, and
format.

[]{#__RefHeading___Toc193253851 .anchor}Table 20. Output Files

  ----------------- ----------------- ----------------- -----------------
  **Instrument**    **File Type**     **Contents**      **Format**

  IASI              EUMETSAT PFS IASI IASI Radiance     EUMETSAT Binary
                    L1C                                 

  IASI              IASI L1C, L2, CCR IASI metadata     xml
                    granule metadata  (FGDC-RSE)        
                    file                                

  IASI              EUMRTSAT IASI     Temperature and   BUFR
                    Level 2 data      moisture profiles 
                    files                               
  ----------------- ----------------- ----------------- -----------------

  -------------- ------------- -------------- --------------------- ------------
  **Contents**   **Spectral    **Data type**  **Spatial Subset**    **Format**
                 Subset**                                           

  IASI radiance  616 channels  IASI radiance  Warmest FOV from      BUFR
                                              every ROR             

  IASI radiance  616 channels  IASI radiance  First FOV from every  BUFR
                                              FOR                   

  IASI radiance  616 channels  IASI radiance  All 9 FOVs from every BUFR
                                              FOR                   

  FOV = Field of                                                    
  View; FOR =                                                       
  Field of                                                          
  Regard;                                                           
  -------------- ------------- -------------- --------------------- ------------

+---------------+-------------+-----+----------+-----------+----------+
| **Contents**  | **Data      | **T | *        | **Res     | **       |
|               | Type**      | ime | *Product | olution** | Format** |
|               |             | pe  | Type**   |           |          |
|               |             | rio |          |           |          |
|               |             | d** |          |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI          | Radiances   | Da  | Global   | 3\*3      | Gridded  |
| Radiances     |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI          | Radiances   | Da  | Global   | 0.5\*2    | Gridded  |
| Radiances     |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI RR/PCS   | RR/PCS      | Da  | Global   | 3\*3      | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI RR/PCS   | RR/PCS      | Da  | Global   | 0.5\*2    | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI GFS      | Radianc     | Da  | Global   | 0.5\*2    | Gridded  |
| Radia         | es/Forecast | ily | grids    |           | Binary   |
| nces/Forecast |             |     |          |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI GDAS     | Radianc     | Da  | Global   | 0.5\*2    | Gridded  |
| Radia         | es/Forecast | ily | grids    |           | Binary   |
| nces/Forecast |             |     |          |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| AMSU-A        | Radiances   | Da  | Global   | 3\*3      | Griddes  |
| Radiances     |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| AMSU-A        | Radiances   | Da  | Global   | 0.5\*2    | Gridded  |
| Radiances     |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| MHS Radiances | Radiances   | Da  | Global   | 3\*3      | Gridded  |
|               |             | ily | Grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| MHS Radiances | Radiances   | Da  | Global   | 0.5\*2    | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI L2       | Profiles    | Da  | Global   | 3\*3      | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI L2       | Profiles    | Da  | Global   | 0.5\*2    | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI CCR      | Radiances   | Da  | Global   | 0.5\*2    | Gridded  |
|               |             | ily | grids    |           | Binary   |
+---------------+-------------+-----+----------+-----------+----------+
| IASI Matchups | Radiances   | Da  | Matchups | N/A       | Binary   |
|               |             | ily |          |           | and      |
|               |             |     | (Radi    |           | NetCDF   |
|               |             |     | osondes) |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI Thinned  | Radiances   | Da  | Thinned  | 2         | Binary   |
| Radiances     |             | ily | data     | scan      |          |
|               |             |     |          | s/granule |          |
+---------------+-------------+-----+----------+-----------+----------+
| AMSU-A        | Radiances   | Da  | Matchups | N/A       | Binary   |
| Matchups      |             | ily |          |           |          |
|               |             |     | (Radi    |           |          |
|               |             |     | osondes) |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| MHS Matchups  | Radiances   | Da  | Matchups | N/a       | Binary   |
|               |             | ily |          |           |          |
|               |             |     | (Radi    |           |          |
|               |             |     | osondes) |           |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI L2       | Profiles    | Da  | Matchups | 100       | Binary   |
| Matchups      |             | ily |          | levels    |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI L2       | Profiles    | Da  |          | 100       | NetCDF   |
|               |             | ily |          | levels    |          |
+---------------+-------------+-----+----------+-----------+----------+
| IASI CCR      | Radiances   | Da  |          |           | NetCDF,  |
|               |             | ily |          |           | BUFR     |
+---------------+-------------+-----+----------+-----------+----------+

## IASI L1C Granule Files

The EUMETSAT PFC IASI L1C binary granule files.

### Purpose

EUMETSAT IASI L1C data are transferred by the NOAA/NESDIS/STAR near real
time processing system to the OSDPD DDS for retrieval by CLASS.

### Data File Description

These files are also input files. They are described in the section
2.1.2 of this document. Specific file details (and more about data and
header records) can be found in:

EPS PROGRAMME IASI Level 1 Product Format Specifications, Ref:
EUM.EPS.SYS.SPE.990003,Issue 6, Rev 6, WEB number 270000, 03/23/2004,
EUMETSAT.\
For the EUMETSAT L1C PFS format refer to the section \"GIADR-QUALITY\",
\"GIADR-SCALE FACTORS\", and \"MDR-1C\" in the Appendix
\"IASI-L1-PFS-6.6-ANNEX\" in the document "EPS PROGRAMME IASI Level 1
Product Format Specifications, Ref: EUM.EPS.SYS.SPE.990003,Issue 6, Rev
6, WEB number 270000, 03/23/2004, EUMETSAT".

EPS Programme Generic Product Format Specification, Ref:
EPS.GGS.SPE.96167, Issue 6, Rev 4, WEB number 270000, 02/11/2003,
EUMETSAT.

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

This file is located at Data Distribution Server:

dds.nesdis.noaa.gov:push

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

NESDIS/CLASS (2006) Producer Archive Submission Agreement for IASI
Products. CLASS-1135-CLS-AGR-IASI. X080.

## IASI Level 1C Granule-Level Metadata

The granule-level metadata files associated with the EUMETSAT IASI Level
1C data.

### Purpose

The metadata files are pushed to the DDS by the STAR near real time
processing system. This system runs in OSDPD operations. CLASS will
access the DDS in accordance with Producer-Archive Submission Agreement
for IASI Products. These granule files are also used to generate subset
data products to be distributed for operational use by the NWS and the
Department of Defense (DOD).

### Data File Description

This file is generated from the granule metadata template
(*IASI_Granule_Metadata_Template.xml*) in by the Check L1C unit.

These are Federal Geographic Data Committee Remote Sensing Extension
(FGDC-RSE) compliant xml format files. There is one metadata file for
every L1C PFS file. These metadata files have the same name structure as
their associated product files except with an *.xml* extension.

[]{#__RefHeading___Toc193253852 .anchor}Table 21. Metadata File Name
Convention and Format

+--------------+-------------------------------------------------------+
| Metadata     | *IASI_xxx_1C_M02\_\${S                                |
| file-naming  | ensing_Start}Z\_\${Sensing_End}Z\_\${P}\_\${D}\_\${Pr |
| Convention   | ocessing_Time_Start}Z\_\_\${Unknown_Date_String}.xml* |
|              |                                                       |
|              | Where:                                                |
|              |                                                       |
|              | IASI = Instrument                                     |
|              |                                                       |
|              | xxx = hard-coded value                                |
|              |                                                       |
|              | 1C = Processing level                                 |
|              |                                                       |
|              | M02 = Satellite                                       |
|              |                                                       |
|              | Sensing_Start = the starting time of observations     |
|              | given in the following format YYYYMODDHHMMSSZ         |
|              |                                                       |
|              | Sensing_End = the ending time of observations given   |
|              | as YYYYMODDHHMMSSZ                                    |
|              |                                                       |
|              | \$P = Processing mode                                 |
|              |                                                       |
|              | \$D = Disposition mode                                |
|              |                                                       |
|              | Processing_Time_Start = the processing time for the   |
|              | observations given as YYYYMODDHHMMSSZ                 |
|              |                                                       |
|              | xml = An extension indicating that the file is an xml |
|              | format file                                           |
|              |                                                       |
|              | The string "YYYYMODDHHMMSSZ" is a date string         |
|              | containing the following components of time:          |
|              |                                                       |
|              | YYYY = 4 digit year (e.g. 2005)                       |
|              |                                                       |
|              | MO = 2 digit month (01-12)                            |
|              |                                                       |
|              | DD = day of month (01-31)                             |
|              |                                                       |
|              | HH = hour (00-23)                                     |
|              |                                                       |
|              | MM = minute (00-59)                                   |
|              |                                                       |
|              | SS = seconds (00-59)                                  |
|              |                                                       |
|              | Z = Greenwich Mean Time                               |
|              |                                                       |
|              | The variable \$P can have any of the following        |
|              | values:                                               |
|              |                                                       |
|              | N = nominal                                           |
|              |                                                       |
|              | B = backlog                                           |
|              |                                                       |
|              | R = reprocessing                                      |
|              |                                                       |
|              | V = validation                                        |
|              |                                                       |
|              | The variable \$D may have any of the following        |
|              | values:                                               |
|              |                                                       |
|              | T = testing                                           |
|              |                                                       |
|              | O = operational                                       |
|              |                                                       |
|              | C = commissioning                                     |
+--------------+-------------------------------------------------------+
| Metadata     | This is an eXtensible Markup Language (XML) format    |
| file format  | file using the FGDC Remote Sensing Extension content  |
|              | standard.                                             |
+--------------+-------------------------------------------------------+
| Expected     | \~12 KB                                               |
| metadata     |                                                       |
| file size    |                                                       |
+--------------+-------------------------------------------------------+

References:

a.  Content Standard for Digital Geospatial Metadata: Extensions for
    Remote Sending Metadata, FGDC-STD-012-2002.

> b\. FGDC (1998) Content Standard for Digital Geospatial Metadata,
> VERSION 2, FGDC- STD-001-1998.

More information about these data sets could be found in Metadata
Description Document (NESDIS/STAR, 2008b).

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

A given granule metadata file resides in the same directory as its
associated product file at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1c*

This file is located at Data Distribution Server:

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## IASI L1CT BUFR granule files

IASI L1CT BUFR granule files.

(Subset according to the scheme specified in the input CDL template).

### Purpose

The BUFR files are L1C subset files generated for use by NWP centers.

The BUFR files are transferred to the DDS and pulled by the NWP centers.
These data are then used for assimilation in numerical models.

### Data File Description

The file structure is based on the content of the BUFR table. Nominally
there are 480 of these files per day. They are generated from the NetCDF
subset files by the program *main_iasi_netcdf_to_bufr* which resides in
the L1C Subsetter unit (figure 4).

[]{#__RefHeading___Toc193253853 .anchor}Table 22. IASI L1CT Granule
Files Subset

+---------------+------------------------+-----------------------------+
| Spectral      | Spatial subset         | Data Type                   |
| subset        |                        |                             |
+---------------+------------------------+-----------------------------+
| 616 channels  | Warmest FOV from every | IASI radiances              |
|               | FOR                    |                             |
| 616 channels  |                        | IASI radiances              |
|               | First FOV from every   |                             |
| 616 channels  | FOR                    | IASI radiances              |
|               |                        |                             |
|               | All 9 FOV from every   |                             |
|               | FOR                    |                             |
+---------------+------------------------+-----------------------------+

The output BUFR file names have the following name structure (Table 23).

[]{#__RefHeading___Toc193253854 .anchor}Table 23. IASI L1C BUFR Granule
File Name Structure

+--------+-------------------------------------------------------------+
| File-  | NPR_IARD.M02_D\${Year}                                      |
| naming | \${Doy}\_S\${Hour}\${Minute}\${Second}\_E\${Hour}\${Minute) |
| Conv   |                                                             |
| ention | \                                                           |
|        | ${Second}\_G\${Granule_Number}\_C\${Channels}\_U\${Subset}\ |
|        | \                                                           |
|        | Where:\                                                     |
|        | NPR = Near realtime processing\                             |
|        | IARD = IASI radiances\                                      |
|        | M02 = MetOp2\                                               |
|        | D = Date\                                                   |
|        | S = Starting time\                                          |
|        | E = Ending time\                                            |
|        | G = Granule\                                                |
|        | C = Channels\                                               |
|        | U = Subset indicator\                                       |
|        | \$Year = 2-digit year\                                      |
|        | \$Doy = 3-digit day of year (1-365)\                        |
|        | \$Hour = 2-digit hour\                                      |
|        | \$Minute = 2-digit minute\                                  |
|        | \$Second = 2-digit second\                                  |
|        | \$Granule = 3-digit granule number (1-480)\                 |
|        | \$Channels = Channel subset (e.g. 616 or 8461)\             |
|        | \$Subset = FOV subset indicator (1, 3, 6, \...)             |
+--------+-------------------------------------------------------------+

BUFR table, needed to read IASI L1C BUFR granule files, is presented in
Appendix A. BUFR encoding template for IASI L1C files is shown below.

  ------- ------------------- ----------------------------- ----------- --------------
  index   descriptor          description                   value       meaning

  0       0-01-007            satellite id                  3           METOP1

  1       0-01-031            id of originating centre      254         EUMETSAT

  2       0-02-019            satellite instrument          221         IASI

  3       0-02-020            satellite classification      61          EPS

  4       0-04-001            year                                      

  5       0-04-002            month                                     

  6       0-04-003            day                                       

  7       0-04-004            hour                                      

  8       0-04-005            minute                                    

  9       2-02-131            change scale +3                           

  10      2-01-138            change width +10                          

  11      0-04-006            second                                    

  12      2-01-000            change width to default                   

  13      2-02-000            change scale to default                   

  14      0-05-001            latitude (high accuracy)                  

  15      0-06-001            longitude (high accuracy)                 

  16      0-07-024            Satellite zenith                          

  17      0-05-021            Satellite azimuth                         

  18      0-07-025            Solar zenith                              

  19      0-05-022            Solar azimuth                             

  20      0-05-043            Pixel number                              

  21      0-05-040            Orbit number                              

  22      2-01-133            change width +5                           

  23      0-05-041            Scan line number              missing     

  24      2-01-000            change width to default                   

  25      2-01-132            change width +4                           

  26      0-25-070            Frame count / granule number  missing     

  27      2-01-000            change width to default                   

  28      2-02-126            change scale -2                           

  29      0-07-001            Height of station                         

  30      2-02-000            change scale to default                   

  31      [0-33-192]{.mark}   [GQisFlagQual]{.mark}         []{.mark}   

  32      [0-33-193]{.mark}   [QGisQualIndex]{.mark}        []{.mark}   

  33      [0-33-194]{.mark}   [QGisQualIndexLoc]{.mark}     []{.mark}   

  34      [0-33-195]{.mark}   [QGisQualIndexRad]{.mark}     []{.mark}   

  35      [0-33-196]{.mark}   [QGisQualIndexSpect]{.mark}   []{.mark}   

  36      [0-33-197]{.mark}   [GQisSysTecSondQual]{.mark}   []{.mark}   

  37      1-03-010            Repeat next 3 descriptors 10              
                              times                                     

  38      [0-25-192]{.mark}   [Start channel]{.mark}        []{.mark}   

  39      [0-25-193]{.mark}   [End channel]{.mark}          []{.mark}   

  40      [0-25-194]{.mark}   [Channel scale factor]{.mark} []{.mark}   

  41      1-05-087            Repeat next 5 descriptors 87              
                              times                                     

  42      1-04-100            Repeat next 4 descriptors 100             
                              times                                     

  43      2-01-136            change width +8                           

  44      0-05-042            Channel number                            

  45      2-01-000            change width to default                   

  46      [0-14-192]{.mark}   [Scaled radiance]{.mark}      []{.mark}   

  47      0-02-019            satellite instrument          591         AVHRR/3

  48      0-25-051            AVHRR channel combination                 

  49      1-09-007            Repeat next 9 descriptors 7               
                              times                                     

  50      [0-05-192]{.mark}   [Y angular position of centre []{.mark}   
                              of gravity]{.mark}                        

  51      [0-05-193]{.mark}   [Z angular position of centre []{.mark}   
                              of gravity]{.mark}                        

  52      0-25-085            Fractional coverage of AVHRR              
                              radiance cluster                          

  53      1-05-006            Repeat next 5 descriptors 6               
                              times                                     

  54      0-05-042            Channel number                            

  55      [0-25-194]{.mark}   [Channel scale factor]{.mark} []{.mark}   

  56      [0-14-193]{.mark}   [Scaled mean radiance]{.mark} []{.mark}   

  57      [0-25-194]{.mark}   [Channel scale factor]{.mark} []{.mark}   

  58      [0-14-194]{.mark}   [Scaled standard deviation of []{.mark}   
                              radiance]{.mark}                          
  ------- ------------------- ----------------------------- ----------- --------------

In the encoding sequence, 14 local descriptors have been used. These are
shaded in grey. These descriptors have been used to simplify the
encoding process. They will be defined in the coordinated BUFR tables as
soon as possible. The information with indices 50 and 51 has been added
in order to give the relative position of the AVHRR cluster in the IASI
field of view.

The software for reading BUFR files can be downloaded from the website:
http://www.nco.ncep.noaa.gov/sib/decoders/BUFRLIB/

### Intended Users

NCEP; FNMOC/NRL; GMAO; JCSDA;

### Access

The files are created in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level1c*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

The BUFR files are distributed from these level 1c directories to the
DDS where they are retrieved by customers:

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Global 1-Band PC Grid Files

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of thinned RR and PCS generated from 1 band).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the 0.5 x 2.0 1-band PC grids is:

NRT_IA1PC\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IA1PC\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- ------------
  **Variable**           **Description**            **Type**   **Size**   **Dim
                                                                          Length**

  YearMonthDay           Year/Month/Day string      real       4          91,720
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude          Lat locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          91,720

  View_Angle             The view angle of the      Real       4          91,720
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          91,720
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          91,720
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          91,720
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          91,720
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          91,720
                         the current IASI FOV (km)                        

  Principal_Components   Principal component        Real       4          91,720,200

  PC_Scores              PC_Scores                  Real       4          91,720,1

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          91,720,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          91,720,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_RR                Reconstructed radiances    Real       4          91,720,616
                         (mW/m2/cm-1/sr)                                  

  IASI_RR_Quality_Flag   0 = accepted, 1 = rejected Real       4          91,720,1

  Dice                   IASI FOR (1-30)            Real       4          91,720
  ---------------------- -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_Global_Grids_1Band/M02_IA1PC\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_Global_Grids_1Band/M02_IA1PC\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Global 3-Band PC Grid Files

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of thinned RR and PCS generated from 3 bands).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the 0.5 x 2.0 3-band PC grids is:

NRT_IA3PC\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IA3PC\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- ------------
  **Variable**           **Description**            **Type**   **Size**   **Dim
                                                                          Length**

  YearMonthDay           Year/Month/Day string      real       4          91,720
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude          Lat locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          91,720

  View_Angle             The view angle of the      Real       4          91,720
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          91,720
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          91,720
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          91,720
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          91,720
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          91,720
                         the current IASI FOV (km)                        

  Principal_Components   Principal component        Real       4          91,720,600

  PC_Scores              PC_Scores                  Real       4          91,720,3

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          91,720,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          91,720,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_RR                Reconstructed radiances    Real       4          91,720,616
                         (mW/m2/cm-1/sr)                                  

  IASI_RR_Quality_Flag   0 = accepted, 1 = rejected Real       4          91,720,3

  Dice                   IASI FOR (1-30)            Real       4          91,720
  ---------------------- -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_Global_Grids_3Band/M02_IA3PC\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_Global_Grids_3Band/M02_IA3PC\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Full Global 1-Band PC Grid Files

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree grids of thinned RR and PCS generated from 1 band).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the 3.0 x 3.0 1-band PC grids is:

NRT_IAF1PC\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAF1PC\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- --------------
  **Variable**           **Description**            **Type**   **Size**   **Dim Length**

  YearMonthDay           Year/Month/Day string      real       4          61,120,4
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          61,120,4

  Grid_Latitude          Lat locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          61,120,4

  View_Angle             The view angle of the      Real       4          61,120,4
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          61,120,4
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          61,120,4
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          61,120,4
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          61,120,4
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          61,120,4
                         the current IASI FOV (km)                        

  Principal_Components   Principal component        Real       4          61,120,4,200

  PC_Scores              PC_Scores                  Real       4          61,120,4,1

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          61,120,4,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          61,120,4,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_RR                Reconstructed radiances    Real       4          61,120,4,616
                         (mW/m2/cm-1/sr)                                  

  IASI_RR_Quality_Flag   0 = accepted, 1 = rejected Real       4          61,120,4,1

  Dice                   IASI FOR (1-30)            Real       4          61,120,4
  ---------------------- -------------------------- ---------- ---------- --------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_FullRes_Global_Grids_1Band/M02_IAF1PC\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_FullRes_Global_Grids_1Band/M02_IAF1PC\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Full Global 3-Band PC Grid Files

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree grids of thinned RR and PCS generated from 3 band).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the 3.0 x 3.0, 3-band PC grids is:

NRT_IAF3PC\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAF3PC\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- --------------
  **Variable**           **Description**            **Type**   **Size**   **Dim Length**

  YearMonthDay           Year/Month/Day string      real       4          61,120,4
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          61,120,4

  Grid_Latitude          Lat locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          61,120,4

  View_Angle             The view angle of the      Real       4          61,120,4
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          61,120,4
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          61,120,4
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          61,120,4
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          61,120,4
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          61,120,4
                         the current IASI FOV (km)                        

  Principal_Components   Principal component        Real       4          61,120,4,200

  PC_Scores              PC_Scores                  Real       4          61,120,4,1

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          61,120,4,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          61,120,4,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_RR                Reconstructed radiances    Real       4          61,120,4,616
                         (mW/m2/cm-1/sr)                                  

  IASI_RR_Quality_Flag   0 = accepted, 1 = rejected Real       4          61,120,4,1

  Dice                   IASI FOR (1-30)            Real       4          61,120,4
  ---------------------- -------------------------- ---------- ---------- --------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_FullRes_Global_Grids_1Band/M02_IAF3PC\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/PC_FullRes_Global_Grids_1Band/M02_IAF3PC\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Global Thinned Radiances

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree global grids of thinned IASI radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

These data sets are also intermediate data sets. They are read into the
processing along with a daily set of forecast files (00Z, 06Z, 12Z, 18Z,
24Z). The data are extracted from the forecast grid and written out to
the IASI global grid resolution.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for f the 0.5 x 2.0 grids is:

NRT_IAGG\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAGG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- ------------
  **Variable**           **Description**            **Type**   **Size**   **Dim
                                                                          Length**

  YearMonthDay           Year/Month/Day string      real       4          91,720
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude          Lat locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          91,720

  View_Angle             The view angle of the      Real       4          91,720
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          91,720
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          91,720
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          91,720
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          91,720
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          91,720
                         the current IASI FOV (km)                        

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          91,720,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          91,720,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_Radiance          IASI radiances             Real       4          91,720,616
                         (mW/m2/cm-1/sr)                                  

  Quality_Flag           0 = accepted, 1 = rejected Real       4          91,720

  Dice                   IASI FOR (1-30)            Real       4          91,720
  ---------------------- -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/NCEP_Global_Grids/M02_IAGG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/NCEP_Global_Grids/M02_IAGG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI Full Global Thinned Radiances

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree global grids of full resolution thinned IASI
radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities. The 3.0 X 3.0 IASI Full Global
grids and their associated metadata files are pulled by CLASS for
storage in the archive. The details of the archive agreement are found
in the IASI Data Submission Agreement (CLASS, 2006).

### Data File Description

The daily global 3° X 3° grids are derived from the IASI level 1C data
provided by EUMETSAT. These files are created daily and consists of (1)
8461 channels of IASI Level 1C radiances, (2) 6 channels of AVHRR Level
1B radiances averaged on to the IASI fields of view, (3) all associated
navigational and temporal information for the observations, and (4)
quality flags. These data are collocated to points on a 3° X 3° global
grid. On a scan line, the IASI fields of view are clustered into 2 X 2
matrices. These clusters of fields of view are referred to as fields of
regard. It is actually this field of regard that is collocated and
stored for each grid point. A daily gridded data set consists of two
files, one for the ascending orbits and the other for the descending.
Because the product requires an entire day's data, it is produced one
day behind real time. For both the ascending and descending daily files
NOAA/NESDIS/STAR generates one associated xml format metadata file.

The files are binary (big endian) data files in direct access format.
The gridded format allows for Grid Analysis and Display System (GrADS)
readability. The files are each 1993265280 bytes in size. Each file
contains 17019 records that are 117120 bytes in length. Each record is
the data for an entire 61 X 120 degree grid. Therefore, if no data were
matched to a particular grid point, that space is still defined on the
grid and is filled with missing values. The file contains no headers.

The file-naming convention for the 3.0 x 3.0 grids is:

NRT_IAFGG\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAFGG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------- -------------------------- ---------- ---------- ---------------
  **Variable**           **Description**            **Type**   **Size**   **Dim Length**

  YearMonthDay           Year/Month/Day string      real       4          61,120,4
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          61,120,4

  Grid_Latitude          Lat locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          61,120,4
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          61,120,4
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          61,120,4

  View_Angle             The view angle of the      Real       4          61,120,4
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          61,120,4
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          61,120,4
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          61,120,4
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          61,120,4
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          61,120,4
                         the current IASI FOV (km)                        

  AVHRR_Mean_Radiances   The mean AVHRR radiances   Real       4          61,120,4,7,6
                         (mW/m2/cm-1/sr)                                  

  AVHRR_Std_Radiances    The standard deviation of  Real       4          61,120,4,7,6
                         the AVHRR radiances                              
                         (mW/m2/cm-1/sr)                                  

  IASI_Radiance          IASI radiances             Real       4          61,120,4,8461
                         (mW/m2/cm-1/sr)                                  

  Quality_Flag           0 = accepted, 1 = rejected Real       4          61,120,4

  Dice                   IASI FOR (1-30)            Real       4          61,120,4
  ---------------------- -------------------------- ---------- ---------- ---------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/FullRes_Global_Grids/M02_IAFGG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/FullRes_Global_Grids/M02_IAFGG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## Full Global Grids Metadata

Metadata file for both ascending and descending 3 x 3 IASI global grids.

### Purpose

The metadata files accompanying the daily 3° X 3° globally-gridded IASI
Level 1C data files.

### Data File description

There is one grid metadata file for each set of ascending and descending
global grid files. It is derived from the grid metadata template
(*IASI_3X3Grid_Metadata_Template.xml*). It is generated in the Global
Grids unit by the script *Run_IASI_FullGlobal_Grids.pl*.

The metadata file has the same name as its associated data files except
that it has a .xml extension.

+---------------+------------------------------------------------------+
| Metadata      | M01_IAFGGYYYYMODD.\${ext}.xml                        |
| file-naming   |                                                      |
| Convention    | Where:                                               |
|               |                                                      |
|               | M01 = MetOp1                                         |
|               |                                                      |
|               | IA = IASI                                            |
|               |                                                      |
|               | FGG = Full Global Grid                               |
|               |                                                      |
|               | YYYY = 4-digit year (e.g., 2008)                     |
|               |                                                      |
|               | MO = Month (01-12)                                   |
|               |                                                      |
|               | DD = Day of month (01-31)                            |
|               |                                                      |
|               | ext = 'asc' for ascending , 'desc' for descending    |
|               |                                                      |
|               | xml = An extension indicating that the file is an    |
|               | xml format file                                      |
+---------------+------------------------------------------------------+
| Metadata file | This is an xml format file using the FGDC Remote     |
| format        | Sensing Extension content standard.                  |
+---------------+------------------------------------------------------+

References:

b.  Content Standard for Digital Geospatial Metadata: Extensions for
    Remote Sending Metadata, FGDC-STD-012-2002.

> b\. FGDC (1998) Content Standard for Digital Geospatial Metadata,
> VERSION 2, FGDC- STD-001-1998.

More information about these data sets could be found in Metadata
Description Document (NESDIS/STAR, 2008b).

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

This file resides in the same directory as its associated data files at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/FullRes_Global_Grids*

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## IASI GFS Forecast Global Grids

Ascending and descending daily gridded binary files of GFS data at the
IASI 0.5 x 2.0 global grid locations.

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the IASI GFS global (0.5 x 2.0) grids is:

M02_IAGFS\${YEAR}\${MONTH}\${DAY}.asc\
M02_IAGFS\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ---------------------------- -------------------------- ---------- ---------- -----------
  **Variable**                 **Description**            **Type**   **Size**   **Dim
                                                                                Length**

  Date                         Year/Month/Day string      Real       4          91, 720
                               given as YYYYMMDD.                               

  Time                         Hours.Fractional_Minutes   Real       4          91, 720

  Run_Hour                     The time of the forecast   Real       4          91, 720
                               run (0, 6, 12, or 18Z).                          

  Forecast_Hour                Forecast projection (0, 3, Real       4          91, 720
                               6, or 9) hours.                                  

  Latitude                     Latitude of IASI FOV on    Real       4          91, 720
                               grid (± 90 degrees).                             

  Longitude                    Longitude of IASI FOV on   Real       4          91, 720
                               grid (± 90 degrees).                             

  Forecast_Latitude            Original latitude on the   Real       4          91, 720
                               forecast grid (± 90                              
                               degrees).                                        

  Forecast_Longitude           Original longitude on the  Real       4          91, 720
                               forecast grid (± 90                              
                               degrees).                                        

  Pressure                     Forecast pressure (mb) for Real       4          91,720,26
                               26 levels                                        

  Temperature                  Forecast temperature       Real       4          91,720,26
                               (Kelvin) for 26 levels                           

  Water_Vapor                  Forecast water vapor mole  Real       4          91,720,21
                               mixing ratio for 21 levels                       

  Ozone                        Forecast ozone mole mixing Real       4          91,720,6
                               ratio for 6 levels                               

  Dew_Point_2m                 Forecast dewpoint at 2 m   Real       4          91,720
                               (Kelvin).                                        

  Temperature_2m               Forecast 2 m temperature   Real       4          91,720
                               (Kelvin).                                        

  Skin_Temperature             Forecast skin temperature  Real       4          91,720,2
                               (Kelvin) for 2 levels                            

  Surface_Pressure             Forecast surface pressure  Real       4          91,720
                               (mb).                                            

  Precip_Water_Content         Forecast Precipitable      Real       4          91,720
                               water content (mm).                              

  Total_Column_Ozone           Forecast total column      Real       4          91,720
                               ozone (dobson)                                   

  Sea_Surface_Temperature      Forecast sea surface       Real       4          91,720
                               temperature (Kelvin).                            

  Land_Fraction                Land fraction at the       Real       4          91,720
                               forecast grid location                           
                               (0-1).                                           

  Temperature_of_30mb_to_0mb   Forecast temperature       Real       4          91,720
                               difference between 30 mb                         
                               and 0 mb (Kelvin).                               
  ---------------------------- -------------------------- ---------- ---------- -----------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/GFS_Forecast_Global_Grids/M02_IAGFS\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/GFS_Forecast_Global_Grids/M02_IAGFS\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI GDAS Forecast Global Grids

Ascending and descending daily gridded binary files of GDAS data at the
IASI 0.5 x 2.0 global grid locations.

### Purpose

These data sets are used for validation purposes and by STAR scientists
for climate reprocessing activities.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the IASI GDAS global (0.5 x 2.0) grids is:

M02_IAGDS\${YEAR}\${MONTH}\${DAY}.asc\
M02_IAGDS\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------- -------------------------- ---------- ---------- -----------
  **Variable**              **Description**            **Type**   **Size**   **Dim
                                                                             Length**

  Date                      Year/Month/Day string      real       4          91, 720
                            given as YYYYMMDD.                               

  Time                      Hours.Fractional_Minutes   Real       4          91, 720

  Run_Hour                  The time of the forecast   Real       4          91, 720
                            run (0, 6, 12, or 18Z).                          

  Forecast_Hour             Forecast projection (0, 3, Real       4          91, 720
                            6, or 9) hours.                                  

  Latitude                  Latitude of IASI FOV on    Real       4          91, 720
                            grid (± 90 degrees).                             

  Longitude                 Longitude of IASI FOV on   Real       4          91, 720
                            grid (± 90 degrees).                             

  Forecast_Latitude         Original latitude on the   Real       4          91, 720
                            forecast grid (± 90                              
                            degrees).                                        

  Forecast_Longitude        Original longitude on the  Real       4          91, 720
                            forecast grid (± 90                              
                            degrees).                                        

  Pressure                  Forecast pressure (mb) for Real       4          91,720,64
                            64 levels                                        

  Temperature               Forecast temperature       Real       4          91,720,64
                            (Kelvin) for 64 levels                           

  Water_Vapor               Forecast water vapor mole  Real       4          91,720,64
                            mixing ratio for 64 levels                       

  Ozone                     Forecast ozone mole mixing Real       4          91,720,64
                            ratio for 64 levels                              

  Dew_Point_2m              Forecast dewpoint at 2 m   Real       4          91,720
                            (Kelvin).                                        

  Temperature_2m            Forecast 2 m temperature   Real       4          91,720
                            (Kelvin).                                        

  Skin_Temperature          Forecast skin temperature  Real       4          91,720,1
                            (Kelvin).                                        

  Surface_Pressure          Forecast surface pressure  Real       4          91,720
                            (mb).                                            

  Precip_Water_Content      Forecast Precipitable      Real       4          91,720
                            water content (mm).                              

  Total_Column_Ozone        Forecast total column      Real       4          91,720
                            ozone (dobson)                                   

  Sea_Surface_Temperature   Forecast sea surface       Real       4          91,720
                            temperature (Kelvin).                            

  Land_Fraction             Land fraction at the       Real       4          91,720
                            forecast grid location                           
                            (0-1).                                           

  Delta_Pressure            Forecast pressure          real       4          91,720,64
                            difference between (mb)                          
                            each of the 64 levels.                           
  ------------------------- -------------------------- ---------- ---------- -----------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/GDAS_Forecast_Global_Grids/M02_IAGDS\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/GDAS_Forecast_Global_Grids/M02_IAGDS\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## AMSU-A *Full Global Grids*

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree grids of AMSU-A radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the AMSU-A full global (3.0 x 3.0) grids is:

M02_AMFG\${YEAR}\${MONTH}\${DAY}.asc\
M02_AMFG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- -----------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          61,120
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          61,120

  Grid_Latitude            Lat locations of the grid  Real       4          61,120
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          61,120
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          61,120
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          61,120
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          61,120

  View_Angle               The view angle of the      Real       4          61,120
                           current IASI FOV (± 90                           
                           degrees)                                         

  Solar_Zenith             The solar zenith of the    Real       4          61,120
                           current IASI FOV (0-90                           
                           degrees)                                         

  Solar_Azimuth            The solar azimuth of the   Real       4          61,120
                           current IASI FOV (0-180                          
                           degrees)                                         

  Satellite_Zenith         The satellite zenith of    Real       4          61,120
                           the current IASI FOV (0-90                       
                           degrees)                                         

  Satellite_Azimuth        The satellite azimuth of   Real       4          61,120
                           the current IASI FOV                             
                           (0-180 degrees)                                  

  Satellite_Height         The satellite height of    Real       4          61,120
                           the current IASI FOV (km)                        

  AMSUA_Radiances          AMSU-A radiances           Real       4          61,120,15
                           (mW/m2/cm-1/sr)                                  

  Quality_Flag             0 = accepted, 1 = rejected Real       4          61,120,15

  Dice                     AMSU-A FOV                 Real       4          61,120

  Topography               The height of the surface  Real       4          61,120
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          61,120
                           coverage (0-1).                                  
  ------------------------ -------------------------- ---------- ---------- -----------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/AMSUA_FullGlobal_Grids/M02_AMFG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/AMSUA_FullGlobal_Grids/M02_AMFG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *AMSU-A Global Grids*

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of AMSU-A radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the AMSU-A global (0.5 x 2.0) grids is:

M02_AMGG\${YEAR}\${MONTH}\${DAY}.asc\
M02_AMGG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- -----------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          91,720
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude            Lat locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          91,720

  View_Angle               The view angle of the      Real       4          91,720
                           current IASI FOV (± 90                           
                           degrees)                                         

  Solar_Zenith             The solar zenith of the    Real       4          91,720
                           current IASI FOV (0-90                           
                           degrees)                                         

  Solar_Azimuth            The solar azimuth of the   Real       4          91,720
                           current IASI FOV (0-180                          
                           degrees)                                         

  Satellite_Zenith         The satellite zenith of    Real       4          91,720
                           the current IASI FOV (0-90                       
                           degrees)                                         

  Satellite_Azimuth        The satellite azimuth of   Real       4          91,720
                           the current IASI FOV                             
                           (0-180 degrees)                                  

  Satellite_Height         The satellite height of    Real       4          91,720
                           the current IASI FOV (km)                        

  AMSUA_Radiances          AMSU-A radiances           Real       4          91,720,15
                           (mW/m2/cm-1/sr)                                  

  Quality_Flag             0 = accepted, 1 = rejected Real       4          91,720,15

  Dice                     AMSU-A FOV                 Real       4          61,120

  Topography               The height of the surface  Real       4          61,120
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          61,120
                           coverage (0-1).                                  
  ------------------------ -------------------------- ---------- ---------- -----------

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/AMSUA_Global_Grids/M02_AMGG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/AMSUA_Global_Grids/M02_AMGG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *MHS Full Global Grids*

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree grids of MHS radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the MHS full global (3.0 x 3.0) grids is:

M02_MHFG\${YEAR}\${MONTH}\${DAY}.asc\
M02_MHFG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- ------------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          61,120,9
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          61,120,9

  Grid_Latitude            Lat locations of the grid  Real       4          61,120,9
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          61,120,9
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          61,120,9
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          61,120,9
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          61,120,9

  View_Angle               The view angle of the      Real       4          61,120,9
                           current IASI FOV (± 90                           
                           degrees)                                         

  Solar_Zenith             The solar zenith of the    Real       4          61,120,9
                           current IASI FOV (0-90                           
                           degrees)                                         

  Solar_Azimuth            The solar azimuth of the   Real       4          61,120,9
                           current IASI FOV (0-180                          
                           degrees)                                         

  Satellite_Zenith         The satellite zenith of    Real       4          61,120,9
                           the current IASI FOV (0-90                       
                           degrees)                                         

  Satellite_Azimuth        The satellite azimuth of   Real       4          61,120,9
                           the current IASI FOV                             
                           (0-180 degrees)                                  

  Satellite_Height         The satellite height of    Real       4          61,120,9
                           the current IASI FOV (km)                        

  MHS_Radiances            AMSU-A radiances           Real       4          61,120,9,5
                           (mW/m2/cm-1/sr)                                  

  Quality_Flag             0 = accepted, 1 = rejected Real       4          61,120,9,5

  Dice                     AMSU-A FOV                 Real       4          61,120,9

  Topography               The height of the surface  Real       4          61,120,9
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          61,120,9
                           coverage (0-1).                                  
  ------------------------ -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/MHS_FullGlobal_Grids/M02_MHFG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/MHS_FullGlobal_Grids/M02_MHFG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *MHS Global Grids*

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of MHS radiances).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the MHS full global (3.0 x 3.0) grids is:

M02_MHGG\${YEAR}\${MONTH}\${DAY}.asc\
M02_MHGG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- ----------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          91,720
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude            Lat locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          91,720

  View_Angle               The view angle of the      Real       4          91,720
                           current IASI FOV (± 90                           
                           degrees)                                         

  Solar_Zenith             The solar zenith of the    Real       4          91,720
                           current IASI FOV (0-90                           
                           degrees)                                         

  Solar_Azimuth            The solar azimuth of the   Real       4          91,720
                           current IASI FOV (0-180                          
                           degrees)                                         

  Satellite_Zenith         The satellite zenith of    Real       4          91,720
                           the current IASI FOV (0-90                       
                           degrees)                                         

  Satellite_Azimuth        The satellite azimuth of   Real       4          91,720
                           the current IASI FOV                             
                           (0-180 degrees)                                  

  Satellite_Height         The satellite height of    Real       4          91,720
                           the current IASI FOV (km)                        

  MHS_Radiances            AMSU-A radiances           Real       4          91,720,5
                           (mW/m2/cm-1/sr)                                  

  Quality_Flag             0 = accepted, 1 = rejected Real       4          91,720,5

  Dice                     AMSU-A FOV                 Real       4          91,720

  Topography               The height of the surface  Real       4          91,720
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          91,720
                           coverage (0-1).                                  
  ------------------------ -------------------------- ---------- ---------- ----------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/MHS_Global_Grids/M02_MHGG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/MHS_Global_Grids/M02_MHGG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *IASI L2 Full Global Grids*

Ascending and descending daily gridded binary files.

(3.0 x 3.0 degree grids of IASI L2).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the IASI L2 full global (3.0 x 3.0) grids is:

NRT_IAL2FGG\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAL2FGG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- ------------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          61,120
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          61,120

  Grid_Latitude            Lat locations of the grid  Real       4          61,120
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          61,120
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          61,120
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          61,120
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          61,120

  View_Angle               The view angle of the      Real       4          61,120
                           current IASI FOV (± 90                           
                           degrees)                                         

  Satellite_Height         The satellite height of    Real       4          61,120
                           the current IASI FOV (km)                        

  Mean_CO2                 Mean CO~2~ in ppm.         Real       4          61,120

  Satellite_Zenith         The satellite zenith       Real       4          61,120

  Topography               The height of the surface  Real       4          61,120
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          61,120
                           coverage (0-1).                                  

  Surface_Pressure         Surface pressure in        Real       4          61,120
                           millibars.                                       

  Skin_Temperature         Skin temperature in        Real       4          61,120
                           Kelvin.                                          

  MW_Surface_Class         Microwave surface class.   integer    4          61,120

  MW_Surface_Emis          Microwave surface          Real       4          61,120
                           emissivity.                                      

  N_Smw_Per_FOV            The number of microwave    Intger     4          61,120
                           spectral points within                           
                           each layer                                       

  nemis_Per_FOV            The number of surface      Integer    4          61,120
                           emissivity hinge points                          
                           within each layer                                

  ncemis_Per_FOV           The number of cloud        Integer    4          61,120
                           emssivity hinge points                           
                           within each layer                                

  ncld_Per_FOV             The number of cloud layers Integer    4          61,120
                           points within each layer                         

  Quality_Flag             Retrieval quality flag     Integer    4          61,120
                           (0=accept, 1=reject).                            

  Cloud_Top_Pressure       Cloud top pressure in      Real       4          61,120,8
                           millibars.                                       

  Cloud_Top_Fraction       Cloud top fractional       Real       4          61,120
                           coverage (0-1).                                  

  Pressure                 Pressure with the current  Real       4          61,120,100
                           layer in millibars.                              

  Effective_Pressure                                  Real       4          61,120,100

  Temperature              Temperature within the     Real       4          61,120,100
                           current layer in Kelvin                          

  H2O                      H~2~O layer column         Real       4          61,120,100
                           density.                                         

  H2O_MR                   H~2~O Mixing ratio (g/g)   Real       4          61,120,100

  O3                       O~3~ layer column density  Real       4          61,120,100
                           (molecules/cm^2^).                               

  O3_MR                    O~3~ mixing ration (ppb)   Real       4          61,120,100

  Liquid_H2O               Liquid H~2~O layer column  Real       4          61,120,100
                           density (molecules/cm^2^).                       

  Liquid_H2O_MR            Liquid H~2~O Mixing Ration Real       4          61,120,100
                           (g/g)                                            

  Ice_Liquid_Flag          Ice liquid flag (0=water,  Real       4          61,120,100
                           1=ice).                                          

  CO                       CO layer column density    Real       4          61,120,100
                           (molecules/cm^2^).                               

  CO_MR                    CO Mixing Ration (ppb)     Real       4          61,120,100

  CH4                      CH4 layer column density   Real       4          61,120,100
                           (molecules/cm^2^).                               

  CH4_MR                   CH4 Mixing ratio (ppb)     Real       4          61,120,100

  CO2                      CO~2~ mixing ratio (ppm).  Real       4          61,120,100

  N2O                      N~2~O layer column density Real       4          61,120,100
                           (molecules/cm^2^).                               

  N2O_MR                   N~2~O mixing ration (ppb)  Real       4          61,120,100

  SO2                      SO~2~ layer column density Real       4          61,120,100
                           (molecules/cm^2^).                               

  SO2_MR                   SO~2~ mixing ratio (ppm).  Real       4          61,120,100

  HNO3                     HNO~3~ layer column        Real       4          61,120,100
                           density (molecules/cm^2^).                       

  HNO3_MR                  HNO~3~ mixing ration (ppb) Real       4          61,120,100

  MW_Frequency             Microwave frequency        Real       4          61,120,16
                           (cm^-1^).                                        

  MW_Emis                  Microwave emissivity.      Real       4          61,120,16

  IR_Emis_Freq             Infrared emissivity hinge  Real       4          61,120,100
                           point frequencies                                
                           (cm^-1^).                                        

  IR_Surface_Emis          Infrared surface           Real       4          61,120,100
                           emissivity                                       

  IR_Surface_Refl          Infrared surface           Real       4          61,120,100
                           reflectances (percent).                          

  Dice                                                Real       4          61,120
  ------------------------ -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

Note that the format is for 1 IASI FOR.  The retieval product uses the\
whole FOR so data are not available for the individual IASI FOVs.

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/L2_FullGlobal_Grids/M02_IAL2FGG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/L2_FullGlobal_Grids/M02_IAL2FGG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *IASI L2 Global Grids*

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of IASI L2).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the IASI L2 global (0.5 x 2.0) grids is:

NRT_IAL2GG\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IAL2GG\${YEAR}\${MONTH}\${DAY}.desc

The content of the files with variable name list and their dimensions
are as follows:

  ------------------------ -------------------------- ---------- ---------- ------------
  **Variable**             **Description**            **Type**   **Size**   **Dim
                                                                            Length**

  YearMonthDay             Year/Month/Day string      real       4          91,720
                           given as YYYYMMDD.                               

  Time                     Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude            Lat locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Grid_Longitude           Lon locations of the grid  Real       4          91,720
                           points (± 90 degrees)                            

  Instrument_Latitude      Lat locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Instrument_Longitude     Lon locations of the       Real       4          91,720
                           actual observations (± 90                        
                           degrees)                                         

  Granule_Number           Granule number             Real       4          91,720

  View_Angle               The view angle of the      Real       4          91,720
                           current IASI FOV (± 90                           
                           degrees)                                         

  Satellite_Height         The satellite height of    Real       4          91,720
                           the current IASI FOV (km)                        

  Mean_CO2                 Mean CO~2~ in ppm.         Real       4          91,720

  Satellite_Zenith         The satellite zenith       Real       4          91,720

  Topography               The height of the surface  Real       4          91,720
                           above sea level (meters).                        

  Land_Fraction            The fraction of land       Real       4          91,720
                           coverage (0-1).                                  

  Surface_Pressure         Surface pressure in        Real       4          91,720
                           millibars.                                       

  Skin_Temperature         Skin temperature in        Real       4          91,720
                           Kelvin.                                          

  MW_Surface_Class         Microwave surface class.   Real       4          91,720

  MW_Surface_Emis          Microwave surface          Real       4          91,720
                           emissivity                                       

  N_Smw_Per_FOV            The number of microwave    Intger     4          91,720
                           spectral points within                           
                           each layer                                       

  nemis_Per_FOV            The number of surface      Integer    4          91,720
                           emissivity hinge points                          
                           within each layer                                

  ncemis_Per_FOV           The number of cloud        Integer    4          91,720
                           emssivity hinge points                           
                           within each layer                                

  ncld_Per_FOV             The number of cloud layers Integer    4          91,720
                           points within each layer                         

  Quality_Flag             Retrieval quality flag     Integer    4          91,720
                           (0=accept, 1=reject).                            

  Cloud_Top_Pressure       Cloud top pressure in      Real       4          91,720,8
                           millibars.                                       

  Cloud_Top_Fraction       Cloud top fractional       Real       4          91,720
                           coverage (0-1).                                  

  Pressure                 Pressure with the current  Real       4          91,720,100
                           layer in millibars.                              

  Effective_Pressure                                  Real       4          91,720,100

  Temperature              Temperature within the     Real       4          91,720,100
                           current layer in Kelvin                          

  H2O                      H~2~O layer column         Real       4          91,720,100
                           density.                                         

  H2O_MR                   H~2~O layer column density Real       4          91,720,100
                           for mixing ratio (g/g)                           

  O3                       O~3~ layer column density  Real       4          91,720,100
                           (molecules/cm^2^).                               

  O3_MR                    O~3~ layer column density  Real       4          91,720,100
                           for mixing ration                                

  Liquid_H2O               Liquid H~2~O layer column  Real       4          91,720,100
                           density (molecules/cm^2^).                       

  Liquid_H2O_MR            Liquid H~2~O layer column  Real       4          91,720,100
                           density for Mixing ration                        
                           (g/g)                                            

  Ice_Liquid_Flag          Ice liquid flag (0=water,  Real       4          91,720,100
                           1=ice).                                          

  CO                       O~3~ layer column density  Real       4          91,720,100
                           (molecules/cm^2^).                               

  CO_MR                                               Real       4          91,720,100

  CH4                      O~3~ layer column density  Real       4          91,720,100
                           (molecules/cm^2^).                               

  CH4_MR                                              Real       4          91,720,100

  CO2                      CO~2~ mixing ratio (ppm).  Real       4          91,720,100

  N2O                      N~2~O layer column density Real       4          91,720,100
                           (molecules/cm^2^).                               

  N2O_MR                                              Real       4          91,720,100

  SO2                      SO~2~ layer column density Real       4          91,720,100
                           (molecules/cm^2^).                               

  SO2_MR                                              Real       4          91,720,100

  HNO3                     HNO~3~ layer column        Real       4          91,720,100
                           density (molecules/cm^2^).                       

  HNO3_MR                                             Real       4          91,720,100

  MW_Frequency             Microwave frequency        Real       4          91,720,16
                           (cm^-1^).                                        

  MW_Emis                  Microwave emissivity.      Real       4          91,720,16

  IR_Emis_Freq             Infrared emissivity hinge  Real       4          91,720,100
                           point frequencies                                
                           (cm^-1^).                                        

  IR_Surface_Emis          Infrared surface           Real       4          91,720,100
                           emissivity                                       

  IR_Surface_Refl          Infrared surface           Real       4          91,720,100
                           reflectances (percent).                          

  Dice                                                Real       4          91,720
  ------------------------ -------------------------- ---------- ---------- ------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

Note that the format is for 1 IASI FOR.  The retieval product uses the\
whole FOR so data are not available for the individual IASI FOVs.

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/L2_Global_Grids/M02_IAL2GG\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/L2_llGlobal_Grids/M02_IAL2GG\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *IASI CCR Global Grids*

Ascending and descending daily gridded binary files.

(0.5 x 2.0 degree grids of IASI CCR).

### Purpose

These data sets are used for validation purposes and by STAR scientists.

### Data File Description

The Global Grids products are generated from daily sets of NetCDF files
and run, operationally, one day behind real time processing. These are
direct access daily binary files in a GRADS readable format. For a given
grid product, the processing defines two grids at a specified
resolution. One grid is for observations, obtained during ascending
orbits, and the other is for descending orbits. Each daily global grid
product consists of one ascending and one descending file. The
file-naming convention for the IASI CCR global (0.5 x 2.0) grids is:

NRT_IACC\${YEAR}\${MONTH}\${DAY}.asc\
NRT_IACC\${YEAR}\${MONTH}\${DAY}.desc

The format of the 2.0 X 0.5 CCR grids is exactly the same as the regular
IASI\
Level 1C grids except that it uses 8461 (instead of 616) channels. The
content of the files with variable name list and their dimensions are as
follows:

  ---------------------- -------------------------- ---------- ---------- -------------
  **Variable**           **Description**            **Type**   **Size**   **Dim
                                                                          Length**

  YearMonthDay           Year/Month/Day string      real       4          91,720
                         given as YYYYMMDD.                               

  Time                   Hours.Fractional_Minutes   Real       4          91,720

  Grid_Latitude          Lat locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Grid_Longitude         Lon locations of the grid  Real       4          91,720
                         points (± 90 degrees)                            

  Instrument_Latitude    Lat locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Instrument_Longitude   Lon locations of the       Real       4          91,720
                         actual observations (± 90                        
                         degrees)                                         

  Granule_Number         Granule number             Real       4          91,720

  View_Angle             The view angle of the      Real       4          91,720
                         current IASI FOV (± 90                           
                         degrees)                                         

  Solar_Zenith           The solar zenith of the    Real       4          91,720
                         current IASI FOV (0-90                           
                         degrees)                                         

  Solar_Azimuth          The solar azimuth of the   Real       4          91,720
                         current IASI FOV (0-180                          
                         degrees)                                         

  Satellite_Zenith       The satellite zenith of    Real       4          91,720
                         the current IASI FOV (0-90                       
                         degrees)                                         

  Satellite_Azimuth      The satellite azimuth of   Real       4          91,720
                         the current IASI FOV                             
                         (0-180 degrees)                                  

  Satellite_Height       The satellite height of    Real       4          91,720
                         the current IASI FOV (km)                        

  AVHRR_Mean_Radiances   (Missing in the simulated  Real       4          91,720,7,6
                         data) These are for 7 FOV                        
                         classes on 6 AVHRR                               
                         channels                                         

  AVHRR_Std_Radiances    Missing in the simulated   Real       4          91,720,7,6
                         data                                             

  IASI_Radiance          IASI radiances             Real       4          91,720,8461
                         (mW/m2/cm-1/sr)                                  

  Quality_Flag           0 = accepted, 1 = rejected Real       4          91,720

  Dice                                              Real       4          91,720

  Topography             The height of the surface  Real       4          91,720
                         above sea level (meters).                        

  Land_Fraction          The fraction of land       Real       4          91,720
                         coverage (0-1).                                  
  ---------------------- -------------------------- ---------- ---------- -------------

The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

### Intended Users

STAR validation scientists.

### Access

These files reside at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/CCR_FullRes_Grids/M02_IACC\${Year}\${Month}\${Day}.asc*

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Grids/CCR_FullGlobal_Grids/M02_IACC\${Year}\${Month}\${Day}.desc*

Files are sent to the DDS by the scripts that generate them. All grids
are pulled from the DDS by STAR into the STAR Collaborative Environment
and stored locally.

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## IASI Matchups

IASI matchups data files

A binary files containing the observed IASI L1CT data collocated and
saved at specified locations.

### Purpose

These data sets are used for matching of IASI L1CT data with different
instruments (e.g. radiosondes, aircraft, satellite measurement, etc.).

### Data File Description

These files contain IASI radiances at a set of specified instrument
locations. They are direct access binary format files containing all the
instrument data on a single instrument field of regard at a given
radiosonde launch time and location. Each file contains all the matchup
data for the given day plus the last three hours of the previous day and
the first three hours of the following day. The date information in the
file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Doy}* = 3-digit day of year

The file contains two header records (described in Tables 23 and 24).
Table 25 describes the content of the data records. Each data record
consists of all the IASI data within the 2X2 cluster of FOVs. The top of
the record contains the information about the particular sonde time and
launch location. The FOR latitude and longitude is the center averaged
latitude and longitude of the 4 IASI FOVs. Nominal file daily sizes are
between 370 and 390 MB.

As a record is read from the file, the contents of each array must then
be mapped into the variables shown in Tables 25. The values must be
recast from real values to what is shown in column three under "type".
Table 23 and 24 show this mapping for the first and second headers,
respectively. Table 25 shows the contents of one of the many data
records that follow the two headers. The fifth column call "dim length"
is the number of elements that are used to store each variable in the
matchup file, but it is also the number of elements required to store
each individual output variable after the remapping and recasting.

  -------- --------------------------------------------------------------
           

  -------- --------------------------------------------------------------

[]{#__RefHeading___Toc193253855 .anchor}Table 24. Matchup Header Record
Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dots                  The number of     Integer    4          1
                                  IASI FOV/FOR.                           
                                  This is always =                        
                                  4                                       

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  matched IASI                            
                                  field of regard                         
                                  clusters                                

  Number_of_IASI_Channels         The number of     Integer    4          1
                                  IASI channels                           
                                  (8461)                                  

  Number_of_AVHRR_Channels        The number of     Integer    4          1
                                  AVHRR channels                          
                                  (6)                                     

  Number_of_AVHRR_FOV_Classes     The number of     Integer    4          1
                                  AVHRR FOV classes                       
                                  (7)                                     

  IASI_Channels                   The IASI channel  Integer    4          8461
                                  numbers (1-8461)                        

  AVHRR_Channels                  The AVHRR channel Integer    4          6
                                  numbers (1-6)                           

  AVHRR_Frequencies               The AVHRR channel Real       4          6
                                  frequencies                             
                                  (cm^-1^).                               

  AVHRR_FOV_Classes               The AVHRR FOV     Integer    4          7
                                  classes (1-7)                           
  ------------------------------- ----------------- ---------- ---------- ----------

[]{#__RefHeading___Toc193253856 .anchor}Table 25. Matchup Header Record
Number

  ------------------ ------------------ ---------- -------------- --------------
  **Variable**       **Description**    **Type**   **Size**       **Dim Length**

  IASI_Frequencies   The IASI channel   Real       4              8461
                     frequencies (cm-1)                           
  ------------------ ------------------ ---------- -------------- --------------

Table 26. Matchup Data Record

  ------------------------ ---------------------- ----------- ---------- ----------- --
  **Variable**             **Description**        **Type**    **Size**   **Dim       
                                                                         Length**    

  Latitude                 Sonde Latitude (± 90   Real        4          1           
                           degrees).                                                 

  Longitude                Sonde Longitude (± 180 Real        4          1           
                           degrees).                                                 

  Year                     Sonde launch year.     Integer     4          1           

  Month                    Sonde launch Month.    Integer     4          1           

  Day                      Sonde launch day.      Integer     4          1           

  Hour                     Sonde launch hour.     Integer     4          1           

  Minute                   Sonde launch minute.   Integer     4          1           

  Maximum_Distance         Distance tolerance =   Real        4          1           
                           100 km.                                                   

  Time_Separation          Time tolerance = 180   Real        4          1           
                           minutes.                                                  

  Distance                 Actual distance (km)   Real        4          1           
                           from the sonde to the                                     
                           matched IASI                                              
                           observation.                                              

  FOR_Latitude             The matched IASI FOR   Real        4          1           
                           latitude (± 90                                            
                           degrees).                                                 

  FOR_Longitude            The matched IASI FOR   Real        4          1           
                           longitude (± 180                                          
                           degrees).                                                 

  Year                     IASI observation year. Integer     4          1           

  Month                    IASI observation       Integer     4          1           
                           month.                                                    

  Day                      IASI observation day.  Integer     4          1           

  Hour                     IASI observation hour  Integer     4          1           

  Minute                   IASI observation       Integer     4          1           
                           minute.                                                   

  Seconds                  IASI observation       Integer     4          1           
                           seconds                                                   

  The following block of                                                             
  variables is repeated 4                                                            
  times. Each block                                                                  
  represents the data for                                                            
  1 of the 4 IASI FOVs.                                                              

  Latitude                 The latitudes of each  Real        4          1           
                           matched IASI FOV (± 90                                    
                           degrees).                                                 

  Longitude                The longitudes of each Real        4          1           
                           matched IASI FOV (±                                       
                           180 degrees).                                             

  Footprint                The IASI field of      Integer     4          1           
                           regard footprint                                          
                           number (1-30) along                                       
                           the scan line.                                            

  View_Angle               The view angles of     Real        4          1           
                           each matched IASI FOV                                     
                           (± 90 degrees).                                           

  Satellite_Height         The satellite height   Real        4          1           
                           of each matched IASI                                      
                           FOV (km).                                                 

  Satellite_Zenith         The satellite zenith   Real        4          1           
                           of each matched IASI                                      
                           FOV (0 - 90 degrees).                                     

  Satellite_Azimuth        The satellite azimuth  Real        4          1           
                           of each matched IASI                                      
                           FOV (0-180 degrees).                                      

  Solar_Zenith             The solar zenith of    Real        4          1           
                           each matched IASI FOV                                     
                           (0-90 degrees).                                           

  Solar_Azimuth            The solar azimuth of   Real        4          1           
                           each matched IASI FOV                                     
                           (0-180 degrees).                                          

  Ascending_Descending     The                    Integer     4          1           
                           ascending-descending                                      
                           status of each matched                                    
                           IASI FOV (0 =                                             
                           ascending,                                                
                           1=descending).                                            

  Orbit_Number             The number of the      Integer     4          1           
                           orbit (since launch)                                      
                           from which the current                                    
                           granule was obtained.                                     

  GQisFlagQual             The QC flag of each    Integer     4          1           
                           matched IASI FOV                                          
                           (0=good, 1=bad).                                          

  GQisQualIndex            The sounder spectra QC Real        4          1           
                           index of each matched                                     
                           IASI FOV.                                                 

  GQisQualIndexLoc         The IASI/AVHRR         Real        4          1           
                           collocation index of                                      
                           each matched IASI FOV.                                    

  GQisQualIndexRad         The radiometric QC     Real        4          1           
                           flag of each matched                                      
                           IASI FOV.                                                 

  GQisQualIndexSpect       The spectral quality   Real        4          1           
                           index of each matched                                     
                           IASI FOV.                                                 

  GQisSysTecSondQual       The sounder quality    Real        4          1           
                           index of each matched                                     
                           IASI FOV.                                                 

  Topography               The height of the      Real        4          1           
                           surface above sea                                         
                           level (meters).                                           

  Land_Fraction            The fraction of land   Real        4          1           
                           coverage (0-1).                                           

  IASI_Radiances           The IASI radiances     Real        4          8461        
                           (mW/m^2^/cm^-1^/sr).                                      

  AVHRR_Mean_Radiances     The mean AVHRR         Real        4          6\*7        
                           radiances                                                 
                           (mW/m^2^/cm^-1^/sr).                                      

  AVHRR_Std_Radiances      The standard deviation Real        4          6\*7        
                           of the AVHRR radiances                                    
                           (mW/m^2^/cm^-1^/sr).                                      

  IASI_Image               IASI sub-pixel image   Real        4          32\*32      
                           radiances                                                 
                           (mW/m^2^/cm^-1^/sr).                                      

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     

                                                                                     
  ------------------------ ---------------------- ----------- ---------- ----------- --

[]{#__RefHeading___Toc193253778 .anchor}Intended Users

STAR validation scientists. STAR climate scientists for offline level 1
and 2 product validation and reprocessing.

### Access

The binary global matchup file resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Matchups/L1C/m02_iasi_radiosonde_machups\_\${Doy}\_\${Year}.binary*

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## EUMETSAT Level 2 BUFR Files

### Purpose

EUMETSAT Level 2 data files in BUFR format.

### Data File Description

Description of these files is presented in section 2.10.2 of this
document.

### Intended Users

AFWA

POC: System Duty Officer

401-294-2586

<sdo@afwa.af.mil>

AFWA/XPSI

106 Peacekeeper Dr.

Offutt AFB, NE 68113

### Access

These data files are pushed into remote server (GFT)
(maco.nesdis.noaa.gov).

POC - Simon Elliott

Meteorological Product Implementation Manager, Operations department

Address: Am Kavalleriesand 31

Darmstadt, Hessen, 64295

Germany

Telephone: (+49) 6151 807 385

Fax: (+49) 6151 807 385

E-Mail Address: <Simon.Elliott@eumetsat.int>

### 

### 

### 

### 

### 

### 

###  {#section-8 .unnumbered}

###   {#section-9 .unnumbered}

### OSDPD GFT Point of Contact

Vincent Tabor

NSOF, 4231 Suitland Road, Suitland, MD, 20746

Tel: (301) 457-5247

E-mail: <Vicent.Tabor@noaa.gov>

## 2-Scan Global File

2 scans single daily global coverage binary file.

### Purpose

This thinned file is used to generate a binary file for offline
eigenvector coefficient file generation. These coefficients are, in
turn, used for generating the principal components and reconstructed
radiances.

### Data File Description

The 2-Scan files are Fortran direct access binary files. Each record
length is exactly 34260 bytes. Each data record contains all the data
for a single IASI FOV. The file contains a single day's data from 480
granules where scan lines 1 and 12 were selected from each. Each 2-scan
record, including the two header records at the top of the file, are
written, and must be read, as a one real-valued, single dimension,
4-byte array. This array must have 8565 elements (34260 bytes/4 bytes).
The contents of each array read from the file must then be mapped into
the variables shown in table 26-28. The values must be recast from real
values to what is shown in column three under "type". Table 26 and 27
show this mapping for header 1 and 2, respectively. Table 28 shows the
contents of one of the many data records that follow the two headers.
The fifth column call "dim length" is the number of elements that are
used to store each variable in the matchup file, but it is also the
number of elements required to store each individual output variable
after the remapping and recasting.

[]{#__RefHeading___Toc193253858 .anchor}Table 27. 2-Scan Header Record
Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Total_Number_of_Records         Total number of   Integer    4          1
                                  records in the                          
                                  file                                    

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dots                  The number of     Integer    4          1
                                  IASI FOV/FOR.                           
                                  This is always =                        
                                  4                                       

  Number_of_Dice                  This is the       Integer    4          1
                                  number of matched                       
                                  IASI FORs within                        
                                  the file                                

  Number_of_IASI_Channels         The number of     Integer    4          1
                                  IASI channels                           

  Number_of_AVHRR_Channels        The number of     Integer    4          1
                                  AVHRR channels                          

  Number_of_AVHRR_FOV_Classes     The number of     Integer    4          1
                                  AVHRR FOV classes                       

  IASI_Channels                   The IASI channel  Integer    4          8461
                                  numbers                                 

  AVHRR_Channels                  The AVHRR channel Integer    4          6
                                  numbers                                 

  AVHRR_Frequencies               The AVHRR channel Real       4          6
                                  frequencies                             

  AVHRR_FOV_Classes               The AVHRR FOV     Integer    4          7
                                  classes                                 
  ------------------------------- ----------------- ---------- ---------- ----------

[]{#__RefHeading___Toc193253859 .anchor}Table 28. 2-Scan Header Record
Number 2

  ------------------ ----------------- -------------- -------------- --------------
  **Variable**       **Description**   **Type**       **Size**       **Dim Length**

  IASI_Frequencies   The IASI channel  Real           4              8461
                     frequencies                                     
                     (cm^-1^).                                       
  ------------------ ----------------- -------------- -------------- --------------

[]{#__RefHeading___Toc193253860 .anchor}Table 29. 2-Scan Data Record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  Scan_Line                Scan line number       Integer     4          1
                           within the current                            
                           granule (1-23)                                

  AMSU_FOV                 The AMSU FOV number    Integer     4          1
                           (1-30) for the current                        
                           scan line. This is the                        
                           same as the IASI FOR                          
                           number.                                       

  IASI_FOV                 The IASI FOV number    Integer     4          1
                           (1-120) for the                               
                           current scan line.                            

  Time                     The current time of    Real        4          1
                           observation (in                               
                           seconds since January                         
                           1^st^ 1970).                                  

  Latitude                 The latitude of the    Real        4          1
                           current IASI FOV (± 90                        
                           degrees).                                     

  Longitude                The longitude of the   Real        4          1
                           current IASI FOV (±                           
                           180 degrees).                                 

  View_Angle               The view angle of the  Real        4          1
                           current IASI FOV (± 90                        
                           degrees).                                     

  Satellite_Height         The satellite height   Real        4          1
                           of the current IASI                           
                           FOV (km).                                     

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of the current IASI                           
                           FOV (0-90 degrees).                           

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of the current IASI                           
                           FOV (0-180 degrees).                          

  Solar_Zenith             The solar zenith of    Real        4          1
                           the current IASI FOV                          
                           (0-90 degrees).                               

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           the current IASI FOV                          
                           (0-180 degrees).                              

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of the current                         
                           orbit (0 = ascending,                         
                           1=descending)                                 

  Orbit_Number             The number of the      Integer     4          1
                           orbit (since launch)                          
                           from which the current                        
                           granule was obtained.                         

  GQisFlagQual             The QC flag of each    Integer     4          1
                           matched IASI FOV                              
                           (0=good, 1=bad)                               

  GQisQualIndex            The sounder spectra QC Real        4          1
                           index of each matched                         
                           IASI FOV                                      

  GQisQualIndexLoc         The IASI/AVHRR         Real        4          1
                           collocation index of                          
                           each matched IASI FOV                         

  GQisQualIndexRad         The radiometric QC     Real        4          1
                           flag of each matched                          
                           IASI FOV                                      

  GQisQualIndexSpect       The spectral quality   Real        4          1
                           index of each matched                         
                           IASI FOV                                      

  GQisSysTecSondQual       The sounder quality    Real        4          1
                           index of each matched                         
                           IASI FOV                                      

  IASI_Radiances           The IASI radiances     Real        4          8461
                           (mW/m^2^/cm^-1^/sr).                          

  AVHRR_Mean_Radiances     The mean AVHRR         Real        4          6\*7
                           radiances                                     
                           (mW/m^2^/cm^-1^/sr).                          

  AVHRR_Std_Radiances      The standard deviation Real        4          6\*7
                           of the AVHRR radiances                        
                           (mW/m^2^/cm^-1^/sr).                          
  ------------------------ ---------------------- ----------- ---------- -----------

### Intended Users

STAR validation scientists.

### Access

This file resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Binaries/2Scan_Global_Binaries/iasi_2scans_8461\_\${Year}\${Month}\${Day}.binary*

This file is sent to the DDS for access by the STAR development
validation team.

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *AM***SU-A Matchups**

AMSU-A data matchup files.

A binary files containing the observed AMSU-A data collocated and saved
at specified locations.

### Purpose

These data sets are used for matching of AMSU-A data with different
instruments (e.g. radiosondes, aircraft, satellite measurement, etc.).

### Data File Description

This is a direct access binary file containing all the instrument data
on a single instrument field of regard at a given radiosonde launch time
and location. Each file contains all the data for the given day plus the
last three hours of the previous day and the first three hours of the
following day. The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Doy}* = 3-digit day of year

Table 30. AMSU-A Matchup Header Record Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  matched AMSU-A                          
                                  observations                            

  Number_of_AMSUA_Channels        The number of     Integer    4          1
                                  AMSUA channels                          
                                  (15)                                    

  AMSUA_Channels                  The AMSUA channel Integer    4          15
                                  numbers (1-15)                          
  ------------------------------- ----------------- ---------- ---------- ----------

Table 31. AMSU-A Matchup Header record Number 2

  ------------------- ----------------- ---------- ------------- -------------
  **Variable**        **Description**   **Type**   **Size**      **Dim
                                                                 Length**

  AMSUA_Frequencies   The AMSUA channel Real       4             15
                      frequencies                                
                      (cm-1)                                     
  ------------------- ----------------- ---------- ------------- -------------

Table 32. AMSU-A Matchup Data record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  Latitude                 Sonde Latitude (± 90   Real        4          1
                           degrees).                                     

  Longitude                Sonde Longitude (± 180 Real        4          1
                           degrees).                                     

  Year                     Sonde launch year.     Integer     4          1

  Month                    Sonde launch Month.    Integer     4          1

  Day                      Sonde launch day.      Integer     4          1

  Hour                     Sonde launch hour.     Integer     4          1

  Minute                   Sonde launch minute.   Integer     4          1

  Maximum_Distance         Distance tolerance =   Real        4          1
                           100 km.                                       

  Time_Separation          Time tolerance = 180   Real        4          1
                           minutes.                                      

  Distance                 Actual distance (km)   Real        4          1
                           from the sonde to the                         
                           matched AMSU-A                                
                           observation.                                  

  FOR_Latitude             The matched AMSU-A FOR Real        4          1
                           latitude (± 90                                
                           degrees).                                     

  FOR_Longitude            The matched AMSU-A FOR Real        4          1
                           longitude (± 180                              
                           degrees).                                     

  Year                     AMSU-A observation     Integer     4          1
                           year.                                         

  Month                    AMSU-A observation     Integer     4          1
                           year.                                         

  Day                      AMSU-A observation     Integer     4          1
                           day.                                          

  Hour                     AMSU-A observation     Integer     4          1
                           hour.                                         

  Minute                   AMSU-A observation     Integer     4          1
                           minute.                                       

  Second                   AMSU-A observation     Integer     4          1
                           seconds.                                      

  Latitude                 The latitudes of each  Real        4          1
                           matched AMSU-A FOV (±                         
                           90 degrees).                                  

  Longitude                The longitudes of each Real        4          1
                           matched AMSU-A FOV (±                         
                           180 degrees).                                 

  Footprint                The AMSU footprint     Integer     4          1
                           number (1-30) along                           
                           the scan line.                                

  View_Angle               The view angles of     Real        4          1
                           each matched AMSU-A                           
                           FOV (± 90 degrees).                           

  Satellite_Height         The satellite height   Real        4          1
                           of each matched AMSU-A                        
                           FOV (km).                                     

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of each matched AMSU-A                        
                           FOV (0 - 90 degrees).                         

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of each matched AMSU-A                        
                           FOV (0-180 degrees).                          

  Solar_Zenith             The solar zenith of    Real        4          1
                           each matched AMSU-A                           
                           FOV (0-90 degrees).                           

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           each matched AMSU-A                           
                           FOV (0-180 degrees).                          

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of each matched                        
                           AMSU-A FOV (0 =                               
                           ascending,                                    
                           1=descending).                                

  Topography               The height of the      Real        4          1
                           surface above sea                             
                           level (meters).                               

  Land_Fraction            The fraction of land   Real        4          1
                           coverage (0-1).                               

  AMSUA_Radiances          The AMSU-A radiances   Real        4          15
                           (mW/m^2^/cm^-1^/sr).                          

  Quality_Flag             The AMSU-A Quality     Integer     4          15
                           Flag (0=good, else                            
                           bad).                                         
  ------------------------ ---------------------- ----------- ---------- -----------

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

The binary global matchup file resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Matchups/L1B/amsua_radiosonde_machups\_\${Doy}\_\${Year}.binary*

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## **MHS Matchups**

MHS data matchup files.

A binary files containing the observed MHS data collocated and saved at
specified locations.

### Purpose

These data sets are used for matching of MHS data with different
instruments (e.g. radiosondes, aircraft, satellite measurement, etc.).

### Data File Description

This is a direct access binary file containing all the instrument data
on a single instrument field of regard at a given radiosonde launch time
and location. Each file contains all the data for the given day plus the
last three hours of the previous day and the first three hours of the
following day. The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Doy}* = 3-digit day of year

Table 33. MHS Matchup Header Record Number 1

  ------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                    **Description**   **Type**   **Size**   **Dim
                                                                          Length**

  Actual_Number_of_Records        Total number of   Integer    4          1
                                  records in the                          
                                  file including                          
                                  the 2 header                            
                                  records                                 

  Record_Length                   Number of bytes   Integer    4          1
                                  per record                              

  Number_of_Dots                  The total number  Integer    4          1
                                  of MHS FOVs with                        
                                  each data record.                       

  Number_of_Dice                  This is the       Integer    4          1
                                  actual number of                        
                                  matched MHS field                       
                                  of regard                               
                                  clusters.                               

  Number_of_MHS_Channels          The number of MHS Integer    4          1
                                  channels (5)                            

  MHS_Channels                    The MHS channel   Integer    4          5
                                  numbers (1-5)                           
  ------------------------------- ----------------- ---------- ---------- ----------

Table 34. MHS Matchup Header Record Number 2

  ----------------- ------------------ ---------- ------------- -------------
  **Variable**      **Description**    **Type**   **Size**      **Dim
                                                                Length**

  MHS_Frequencies   The MHS channel    Real       4             5
                    frequencies (cm-1)                          
  ----------------- ------------------ ---------- ------------- -------------

Table 35. MHS Matchup Data Record

  ------------------------ ---------------------- ----------- ---------- -----------
  **Variable**             **Description**        **Type**    **Size**   **Dim
                                                                         Length**

  Latitude                 Sonde Latitude (± 90   Real        4          1
                           degrees).                                     

  Longitude                Sonde Longitude (± 180 Real        4          1
                           degrees).                                     

  Year                     Sonde launch year.     Integer     4          1

  Month                    Sonde launch Month.    Integer     4          1

  Day                      Sonde launch day.      Integer     4          1

  Hour                     Sonde launch hour.     Integer     4          1

  Minute                   Sonde launch minute.   Integer     4          1

  Maximum_Distance         Distance tolerance =   Real        4          1
                           100 km.                                       

  Time_Separation          Time tolerance = 180   Real        4          1
                           minutes.                                      

  Distance                 Actual distance (km)   Real        4          1
                           from the sonde to the                         
                           matched MHS                                   
                           observation.                                  

  FOR_Latitude             The matched MHS FOR    Real        4          1
                           latitude (± 90                                
                           degrees).                                     

  FOR_Longitude            The matched MHS FOR    Real        4          1
                           longitude (± 180                              
                           degrees).                                     

  Year                     MHS center FOV         Integer     4          1
                           observation year.                             

  Month                    MHS center FOV         Integer     4          1
                           observation month.                            

  Day                      MHS center FOV         Integer     4          1
                           observation day.                              

  Hour                     MHS center FOV         Integer     4          1
                           observation hour.                             

  Minute                   MHS center FOV         Integer     4          1
                           observation minute.                           

  Second                   MHS center FOV         Integer     4          1
                           observation second.                           

  The following block of                                                 
  variables is repeated 9                                                
  times. Each block                                                      
  represents the data for                                                
  1 of the 9 MHS FOVs.                                                   

  Latitude                 The latitudes of each  Real        4          1
                           matched MHS FOV (± 90                         
                           degrees).                                     

  Longitude                The longitudes of each Real        4          1
                           matched MHS FOV (± 180                        
                           degrees).                                     

  Footprint                The MHS field of       Integer     4          1
                           regard (1-30) along                           
                           the scan line.                                

  View_Angle               The view angles of     Real        4          1
                           each matched MHS FOV                          
                           (± 90 degrees).                               

  Satellite_Height         The satellite height   Real        4          1
                           of each matched MHS                           
                           FOV (km).                                     

  Satellite_Zenith         The satellite zenith   Real        4          1
                           of each matched MHS                           
                           FOV (0 - 90 degrees).                         

  Satellite_Azimuth        The satellite azimuth  Real        4          1
                           of each matched MHS                           
                           FOV (0-180 degrees).                          

  Solar_Zenith             The solar zenith of    Real        4          1
                           each matched MHS FOV                          
                           (0-90 degrees).                               

  Solar_Azimuth            The solar azimuth of   Real        4          1
                           each matched MHS FOV                          
                           (0-180 degrees).                              

  Ascending_Descending     The                    Integer     4          1
                           ascending-descending                          
                           status of each matched                        
                           MHS FOV (0 =                                  
                           ascending,                                    
                           1=descending).                                

  MHS_Radiances            The MHS radiances      Real        4          5
                           (mW/m^2^/cm^-1^/sr).                          

  Quality_Flag             The MHS-A Quality Flag Integer     4          5
                           (0=good, else bad).                           
  ------------------------ ---------------------- ----------- ---------- -----------

### Intended Users

STAR validation scientists. STAR climate scientists.

### Access

The binary global matchup file resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Matchups/L1B/mhs_radiosonde_machups\_\${Doy}\_\${Year}.binary*

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## **IASI L2 Matchups**

L2 data matchup files

### Purpose

These data sets are used for matching Level 2 data with different
instruments (e.g. radiosondes, aircraft, satellite measurement, etc.).

### Data File Description

This is a direct access binary file containing all the instrument data
on a single instrument field of regard at a given radiosonde launch time
and location. Each file contains all the data for the given day plus the
last three hours of the previous day and the first three hours of the
following day. The date information in the file names is defined as:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Doy}* = 3-digit day of year

Table 36. IASI L2 matchup Header Record Number 1

  -------------------------------- ----------------- ---------- ---------- ----------
  **Variable**                     **Description**   **Type**   **Size**   **Dim
                                                                           Length**

  Actual_Number_of_Records         Total number of   Integer    4          1
                                   records in the                          
                                   file including                          
                                   the 1 header                            
                                   record                                  

  Record_Length                    Number of bytes   Integer    4          1
                                   per record                              

  Number_of_Dice                   This is the       Integer    4          1
                                   actual number of                        
                                   matched IASI L2                         
                                   observations.                           

  Number_of_P_Levels               The number of     Integer    4          1
                                   pressure levels                         

  Number_of_MW_Spectral_Pts        The number of     Integer    4          1
                                   microwave                               
                                   spectral points                         

  Number_of_Surf_Emis_Hinge_Pts    The number of     Integer    4          1
                                   surface                                 
                                   emissivity hinge                        
                                   points                                  

  Number_of_Cloud_Emis_Hinge_Pts   The number of     Integer    4          1
                                   cloud emissivity                        
                                   hinge points                            

  Number_of_Cloud_Layers           The number of     Integer    4          1
                                   cloud layers                            
  -------------------------------- ----------------- ---------- ---------- ----------

Table 37. IASI L2 Matchup Data record

  --------------------------------- ---------------------- ----------- ---------- -----------
  **Variable**                      **Description**        **Type**    **Size**   **Dim
                                                                                  Length**

  Latitude                          Sonde Latitude (± 90   Real        4          1
                                    degrees).                                     

  Longitude                         Sonde Longitude (± 180 Real        4          1
                                    degrees).                                     

  Year                              Sonde launch year.     Integer     4          1

  Month                             Sonde launch Month.    Integer     4          1

  Day                               Sonde launch day.      Integer     4          1

  Hour                              Sonde launch hour.     Integer     4          1

  Minute                            Sonde launch minute.   Integer     4          1

  Maximum_Distance                  Distance tolerance =   Real        4          1
                                    100 km.                                       

  Time_Separation                   Time tolerance = 180   Real        4          1
                                    minutes.                                      

  Distance                          Actual distance (km)   Real        4          1
                                    from the sonde to the                         
                                    matched IASI                                  
                                    observation.                                  

  Year                              IASI observation year. Integer     4          1

  Month                             IASI observation       Integer     4          1
                                    month.                                        

  Day                               IASI observation day.  Integer     4          1

  Hour                              IASI observation hour  Integer     4          1

  Minute                            IASI observation       Integer     4          1
                                    minute.                                       

  Seconds                           IASI observation       Integer     4          1
                                    seconds                                       

  Latitude                          The latitude of the    Real        4          1
                                    matched IASI FOR (± 90                        
                                    degrees).                                     

  Longitude                         The longitude of the   Real        4          1
                                    matched IASI FOR (±                           
                                    180 degrees).                                 

  Footprint                         The IASI field of      Integer     4          1
                                    regard footprint                              
                                    number (1-30) along                           
                                    the scan line.                                

  View_Angle                        The view angle of the  Real        4          1
                                    matched IASI FOR (± 90                        
                                    degrees).                                     

  Satellite_Height                  The satellite height   Real        4          1
                                    of the matched IASI                           
                                    FOR (km).                                     

  Solar_Zenith                      The solar zenith of    Real        4          1
                                    the matched IASI FOR                          
                                    (0-90 degrees).                               

  Ascending_Descending              The                    Integer     4          1
                                    ascending-descending                          
                                    status of the matched                         
                                    IASI FOR (0 =                                 
                                    ascending,                                    
                                    1=descending).                                

  Topography                        The height of the      Real        4          1
                                    surface above sea                             
                                    level (meters).                               

  Land_Fraction                     The fraction of land   Real        4          1
                                    coverage (0-1).                               

  Surface_Pressure                  Surface pressure in    Real        4          1
                                    millibars.                                    

  Skin_Temperature                  Skin temperature in    Real        4          1
                                    Kelvin.                                       

  Mean_CO~2~                        Mean CO~2~ in ppm.     Real        4          1

  MW_Surface_Class                  Microwave surface      Integer     4          1
                                    class.                                        

  MW_Surface_Emis                   Microwave surface      Real        4          1
                                    emissivity.                                   

  Bottom_Level_Index                The index of the       Integer     4          1
                                    pressure array that                           
                                    marks the pressure at                         
                                    the surface.                                  

  N_Smw_Per_FOV                     The number of          Integer     4          1
                                    microwave spectral                            
                                    points within each                            
                                    layer                                         

  nemis_Per_FOV                     The number of surface  Integer     4          1
                                    emissivity hinge                              
                                    points within each                            
                                    layer                                         

  ncemis_Per_FOV                    The number of cloud    Integer     4          1
                                    emssivity hinge points                        
                                    within each layer                             

  ncld_Per_FOV                      The number of cloud    Integer     4          1
                                    layers points within                          
                                    each layer                                    

  Quality_Flag                      Retrieval quality flag Integer     4          1
                                    (0=accept, 1=reject).                         

  The following block of 2                                                        
  variables is repeated                                                           
  Number_of_Cloud_Layers (nominally                                               
  8) times. The user of these data                                                
  must check the header to obtain                                                 
  the value of                                                                    
  Number_of_Cloud_Layers.                                                         

  Cloud_Top_Pressure                Cloud top pressure in  Real        4          1
                                    millibars.                                    

  Cloud_Top_Fraction                Cloud top fractional   Real        4          1
                                    coverage (0-1).                               

  The following block of 12                                                       
  variables is repeated                                                           
  Number_of_P_Levels (nominally                                                   
  100) times. The user of these                                                   
  data must check the header to                                                   
  obtain the value of                                                             
  Number_of_P_Levels.                                                             

  Pressure                          Pressure with the      Real        4          1
                                    current layer in                              
                                    millibars.                                    

  Temperature                       Temperature within the Real        4          1
                                    current layer in                              
                                    Kelvin                                        

  H~2~O                             H~2~O layer column     Real        4          1
                                    density.                                      

  O~3~                              O~3~ layer column      Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  Liquid_H~2~O                      Liquid H~2~O layer     Real        4          1
                                    column density                                
                                    (molecules/cm^2^).                            

  Ice_Liquid_Flag                   Ice liquid flag        Integer     4          1
                                    (0=water, 1=ice).                             

  CO                                CO layer column        Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  CH~4~                             CH4 layer column       Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  CO~2~                             CO~2~ mixing ratio     Real        4          1
                                    (ppm).                                        

  N~2~O                             N~2~O layer column     Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  SO~2~                             SO~2~ layer column     Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  HNO~3~                            HNO~3~ layer column    Real        4          1
                                    density                                       
                                    (molecules/cm^2^).                            

  The following block of 2                                                        
  variables is repeated                                                           
  Number_of_MW_Spectral_Pts                                                       
  (nominally 16) times. The user of                                               
  these data must check the header                                                
  to obtain the value of                                                          
  Number_of_MW_Spectral_Pts.                                                      

  MW_Frequency                      Microwave frequency    Real        4          1
                                    (cm^-1^).                                     

  MW_Emis                           Microwave emissivity.  Real        4          1

  The following block of 3                                                        
  variables is repeated                                                           
  Number_of_Surf_Emis_Hinge_Pts                                                   
  (nominally 100) times. The user                                                 
  of these data must check the                                                    
  header to obtain the value of                                                   
  Number_of_Surf_Emis_Hinge_Pts.                                                  

  IR_Emis_Freq                      Infrared emissivity    Real        4          1
                                    hinge point                                   
                                    frequencies (cm^-1^).                         

  IR_Surface_Emis                   Infrared surface       Real        4          1
                                    emissivity                                    

  IR_Surface_Refl                   Infrared surface       Real        4          1
                                    reflectances                                  
                                    (percent).                                    

  The following block of 3                                                        
  variables is repeated                                                           
  Number_of_Cloud_Emis_Hinge_Pts                                                  
  (nominally 100) times. The user                                                 
  of these data must check the                                                    
  header to obtain the value of                                                   
  Number_of_Cloud_Emis_Hinge_Pts.                                                 

  The following block of 3                                                        
  variables is repeated                                                           
  Number_of_Cloud_Layers (nominally                                               
  8) times. The user of these data                                                
  must check the header to obtain                                                 
  the value of                                                                    
  Number_of_Cloud_Layers.                                                         

  Cloud_Freq                        Cloud infrared         Real        4          1
                                    frequencies (cm^-1^).                         

  Cloud_Refl                        Cloud infrared         Real        4          1
                                    reflectivity.                                 

  Cloud_Emis                        Cloud infrared         Real        4          1
                                    emissivity.                                   
  --------------------------------- ---------------------- ----------- ---------- -----------

### Intended Users

STAR validation scientists. STAR climate scientists.

### **Access**

The binary global matchup file resides at:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Global_Matchups/L2/iasi_l2_radiosonde_machups\_\${Doy}\_\${Year}.binary*

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI L2 NetCDF Files

### Purpose 

###   {#section-10 .unnumbered}

These files will be archived to Comprehensive Large Array-data
Stewardship System (CLASS).

### Data File Description

The Level 2 NetCDF granule files are generated from
*main_iasi_l2_to_netcdf* . The input files are the native binary format
retrieval output files. This program is part of the L2 Processing Unit.
The files they create are produced in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

The following NetCDF intermediate file is produced for each granule with
the following name structure.

iasi_l2\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

where:

\$Year = 4-digit year

\$Month = 2-digit month

\$Day = 2-digit day

\$Granule_Number = 3-digit granule number

This is full spatial and spectral resolution file. It's starting and
ending scan lines and footprints match those of the full resolution
Level 1C IASI, AMSU-A, and MHS L1B NetCDF files for the same granule
number described above. This file is used in both the Global Grids and
Global Binaries units. It is also used to generate additional NetCDF
file which is archived to CLASS:

IASI_L2_M02_V\${YYMMDD}\_\${YYYYMODDHHMMSS}Z\_\${YYYYMODDHHMMSS}Z.nc

where:

IASI = Instrument name

L2 = the product type

M02 = Satellite ID (M02 = Metop-A)

V = Version indicator

\$YYMMDD = 2-digit year + 2-digit month + 2-digit day (the date the
version was created)

Sensing date/time string = Date/time of observations given in the
following format YYYYMODDHHMMSSZ. The first string indicates the
starting date/time and the second string indicates the ending date/time.

nc = File type extension indicates NetCDF format

Where:

The string "YYYYMODDHHMMSSZ" is a date string containing the following
components of time:

YYYY = 4 digit year (e.g. 2005)

MO = 2 digit month (01-12)

DD = day of month (01-31)

HH = hour (00-23)

MM = minute (00-59)

SS = seconds (00-59)

Z = Greenwich Mean Time (GMT)

Here is an example of a file created using software version 071016 on
February 11^th^, 2008. The granule starts at 04:23:59 GMT and ends at
04:26:55 GMT:

IASI_L2_M02_V071016_20080211042359Z_20080211042655Z.nc

This granule file has an associated metadata xml file which is archived
to CLASS.

Table 38. IASI L2 NetCDF Header

+---------+------------------------------------------------------------+
| dime    | Number_of_Dice = 660 ; // Number IASI fields of regard     |
| nsions: | written (max nobs)                                         |
|         |                                                            |
| var     | Number_of_P_Levels = 100 ; // Number of pressure levels    |
| iables: | (max nl2lev)                                               |
|         |                                                            |
|         | Number_of_MW_Spectral_Pts = 16 ; // Number of microwave    |
|         | spectral points (max N_Smw)                                |
|         |                                                            |
|         | Number_of_Surf_Emis_Hinge_Pts = 100 ; // Number of surface |
|         | emissivity hinge points (max nemis)                        |
|         |                                                            |
|         | Number_of_Cloud_Emis_Hing_Pts = 100 ; // Number of cloud   |
|         | emissivity hinge points (max ncemis)                       |
|         |                                                            |
|         | Number_of_Cloud_Layers = 8 ; // Number of cloud layers     |
|         | (max ncld)                                                 |
|         |                                                            |
|         | Number_of_Stability_Parameters = 16 ; // Number of         |
|         | stability parameters                                       |
|         |                                                            |
|         | long Dice(Number_of_Dice) ;                                |
|         |                                                            |
|         | Dice:long_name = \"The index of the AMSU FOV\" ;           |
|         |                                                            |
|         | Dice:units = \"none\" ;                                    |
|         |                                                            |
|         | Dice:scale_factor = 1.0d ;                                 |
|         |                                                            |
|         | Dice:add_offset = 0.0d ;                                   |
|         |                                                            |
|         | Dice:parameter_type = \"IASI data\" ;                      |
|         |                                                            |
|         | Dice:valid_range = 1.0f, 660.0f ;                          |
|         |                                                            |
|         | Dice:\_FillValue = -9999 ;                                 |
|         |                                                            |
|         | double Time(Number_of_Dice) ;                              |
|         |                                                            |
|         | Time:long_name = \"UTC Milliseconds since Jan 1, 1970\" ;  |
|         |                                                            |
|         | Time:units = \"msec\" ;                                    |
|         |                                                            |
|         | Time:scale_factor = 1.0d ;                                 |
|         |                                                            |
|         | Time:add_offset = 0.0d ;                                   |
|         |                                                            |
|         | Time:parameter_type = \"IASI data\" ;                      |
|         |                                                            |
|         | Time:valid_range = 0.0f, 1577836800000.0f ;                |
|         |                                                            |
|         | Time:\_FillValue = -9999.0 ;                               |
|         |                                                            |
|         | float Latitude(Number_of_Dice) ;                           |
|         |                                                            |
|         | Latitude:long_name = \"Retrieval latitude values for each  |
|         | AMSU FOV\" ;                                               |
|         |                                                            |
|         | Latitude:units = \"degrees North\" ;                       |
|         |                                                            |
|         | Latitude:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | Latitude:add_offset = 0.0d ;                               |
|         |                                                            |
|         | Latitude:parameter_type = \"IASI data\" ;                  |
|         |                                                            |
|         | Latitude:valid_range = 90.0f, -90.0f ;                     |
|         |                                                            |
|         | Latitude:\_FillValue = -9999.0f ;                          |
|         |                                                            |
|         | float Longitude(Number_of_Dice) ;                          |
|         |                                                            |
|         | Longitude:long_name = \"Retrieval longitude values for     |
|         | each AMSU FOV\" ;                                          |
|         |                                                            |
|         | Longitude:units = \"degrees East\" ;                       |
|         |                                                            |
|         | Longitude:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Longitude:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Longitude:parameter_type = \"IASI data\" ;                 |
|         |                                                            |
|         | Longitude:valid_range = -180.0f, 179.99f ;                 |
|         |                                                            |
|         | Longitude:\_FillValue = -9999.0f ;                         |
|         |                                                            |
|         | float View_Angle(Number_of_Dice) ;                         |
|         |                                                            |
|         | View_Angle:long_name = \"View angle for each AMSU FOV\" ;  |
|         |                                                            |
|         | View_Angle:units = \"degrees\" ;                           |
|         |                                                            |
|         | View_Angle:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | View_Angle:add_offset = 0.0d ;                             |
|         |                                                            |
|         | View_Angle:parameter_type = \"IASI data\" ;                |
|         |                                                            |
|         | View_Angle:valid_range = -360.0f, 360.0f ;                 |
|         |                                                            |
|         | View_Angle:\_FillValue = -9999.0f ;                        |
|         |                                                            |
|         | float Satellite_Height(Number_of_Dice) ;                   |
|         |                                                            |
|         | Satellite_Height:long_name = \"Satellite height above each |
|         | AMSU FOV\" ;                                               |
|         |                                                            |
|         | Satellite_Height:units = \"km\" ;                          |
|         |                                                            |
|         | Satellite_Height:scale_factor = 1.0d ;                     |
|         |                                                            |
|         | Satellite_Height:add_offset = 0.0d ;                       |
|         |                                                            |
|         | Satellite_Height:parameter_type = \"IASI data\" ;          |
|         |                                                            |
|         | Satellite_Height:valid_range = 0.0f, 1000.0f ;             |
|         |                                                            |
|         | Satellite_Height:\_FillValue = -9999.0f ;                  |
|         |                                                            |
|         | float Mean_CO2(Number_of_Dice) ;                           |
|         |                                                            |
|         | Mean_CO2:long_name = \"Column averaged CO2 per AMSU FOV\"  |
|         | ;                                                          |
|         |                                                            |
|         | Mean_CO2:units = \"ppm\" ;                                 |
|         |                                                            |
|         | Mean_CO2:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | Mean_CO2:add_offset = 0.0d ;                               |
|         |                                                            |
|         | Mean_CO2:parameter_type = \"IASI data\" ;                  |
|         |                                                            |
|         | Mean_CO2:valid_range = 0.0f, 1000.0f ;                     |
|         |                                                            |
|         | Mean_CO2:\_FillValue = -9999.0f ;                          |
|         |                                                            |
|         | float Solar_Zenith(Number_of_Dice) ;                       |
|         |                                                            |
|         | Solar_Zenith:long_name = \"Solar zenith angles for each    |
|         | AMSU FOV\" ;                                               |
|         |                                                            |
|         | Solar_Zenith:units = \"degrees\" ;                         |
|         |                                                            |
|         | Solar_Zenith:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | Solar_Zenith:add_offset = 0.0d ;                           |
|         |                                                            |
|         | Solar_Zenith:parameter_type = \"IASI data\" ;              |
|         |                                                            |
|         | Solar_Zenith:valid_range = 0.f, 90.f ;                     |
|         |                                                            |
|         | Solar_Zenith:\_FillValue = -9999.f ;                       |
|         |                                                            |
|         | short Ascending_Descending(Number_of_Dice) ;               |
|         |                                                            |
|         | Ascending_Descending:long_name = \"0=Descending,           |
|         | 1=Ascending\" ;                                            |
|         |                                                            |
|         | Ascending_Descending:units = \"none\" ;                    |
|         |                                                            |
|         | Ascending_Descending:scale_factor = 1 ;                    |
|         |                                                            |
|         | Ascending_Descending:add_offset = 0 ;                      |
|         |                                                            |
|         | Ascending_Descending:parameter_type = \"IASI data\" ;      |
|         |                                                            |
|         | Ascending_Descending:valid_range = 0, 1 ;                  |
|         |                                                            |
|         | Ascending_Descending:\_FillValue = -9999s ;                |
|         |                                                            |
|         | float Topography(Number_of_Dice) ;                         |
|         |                                                            |
|         | Topography:long_name = \"Surface height\" ;                |
|         |                                                            |
|         | Topography:units = \"meters\" ;                            |
|         |                                                            |
|         | Topography:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | Topography:add_offset = 0.0d ;                             |
|         |                                                            |
|         | Topography:parameter_type = \"IASI data\" ;                |
|         |                                                            |
|         | Topography:valid_range = 0.f, 10000.f ;                    |
|         |                                                            |
|         | Topography:\_FillValue = -9999.f ;                         |
|         |                                                            |
|         | float Land_Fraction(Number_of_Dice) ;                      |
|         |                                                            |
|         | Land_Fraction:long_name = \"Land fraction\" ;              |
|         |                                                            |
|         | Land_Fraction:units = \"none\" ;                           |
|         |                                                            |
|         | Land_Fraction:scale_factor = 1.0d ;                        |
|         |                                                            |
|         | Land_Fraction:add_offset = 0.0d ;                          |
|         |                                                            |
|         | Land_Fraction:parameter_type = \"IASI data\" ;             |
|         |                                                            |
|         | Land_Fraction:valid_range = 0.f, 1.f ;                     |
|         |                                                            |
|         | Land_Fraction:\_FillValue = -9999.f ;                      |
|         |                                                            |
|         | float Surface_Pressure(Number_of_Dice) ;                   |
|         |                                                            |
|         | Surface_Pressure:long_name = \"Surface pressure\" ;        |
|         |                                                            |
|         | Surface_Pressure:units = \"mb\" ;                          |
|         |                                                            |
|         | Surface_Pressure:scale_factor = 1.0d ;                     |
|         |                                                            |
|         | Surface_Pressure:add_offset = 0.0d ;                       |
|         |                                                            |
|         | Surface_Pressure:parameter_type = \"IASI data\" ;          |
|         |                                                            |
|         | Surface_Pressure:valid_range = 0.f, 10000.f ;              |
|         |                                                            |
|         | Surface_Pressure:\_FillValue = -9999.f ;                   |
|         |                                                            |
|         | float Skin_Temperature(Number_of_Dice) ;                   |
|         |                                                            |
|         | Skin_Temperature:long_name = \"Skin temperature\" ;        |
|         |                                                            |
|         | Skin_Temperature:units = \"Kelvin\" ;                      |
|         |                                                            |
|         | Skin_Temperature:scale_factor = 1.0d ;                     |
|         |                                                            |
|         | Skin_Temperature:add_offset = 0.0d ;                       |
|         |                                                            |
|         | Skin_Temperature:parameter_type = \"IASI data\" ;          |
|         |                                                            |
|         | Skin_Temperature:valid_range = 0.f, 1000.f ;               |
|         |                                                            |
|         | Skin_Temperature:\_FillValue = -9999.f ;                   |
|         |                                                            |
|         | short MW_Surface_Class(Number_of_Dice) ;                   |
|         |                                                            |
|         | MW_Surface_Class:long_name = \"Microwave surface class\" ; |
|         |                                                            |
|         | MW_Surface_Class:units = \"none\" ;                        |
|         |                                                            |
|         | MW_Surface_Class:scale_factor = 1 ;                        |
|         |                                                            |
|         | MW_Surface_Class:add_offset = 0 ;                          |
|         |                                                            |
|         | MW_Surface_Class:parameter_type = \"IASI data\" ;          |
|         |                                                            |
|         | MW_Surface_Class:valid_range = 0, 10 ;                     |
|         |                                                            |
|         | MW_Surface_Class:\_FillValue = -9999s ;                    |
|         |                                                            |
|         | float MW_Surface_Emis(Number_of_Dice) ;                    |
|         |                                                            |
|         | MW_Surface_Emis:long_name = \"Microwave surface            |
|         | emissivity\" ;                                             |
|         |                                                            |
|         | MW_Surface_Emis:units = \"none\" ;                         |
|         |                                                            |
|         | MW_Surface_Emis:scale_factor = 1.0d ;                      |
|         |                                                            |
|         | MW_Surface_Emis:add_offset = 0.0d ;                        |
|         |                                                            |
|         | MW_Surface_Emis:parameter_type = \"IASI data\" ;           |
|         |                                                            |
|         | MW_Surface_Emis:valid_range = 0.f, 1.f ;                   |
|         |                                                            |
|         | MW_Surface_Emis:\_FillValue = -9999.f ;                    |
|         |                                                            |
|         | long N_Smw_Per_FOV(Number_of_Dice) ;                       |
|         |                                                            |
|         | N_Smw_Per_FOV:long_name = \"Number of MW spectral points   |
|         | AMSU FOV\" ;                                               |
|         |                                                            |
|         | N_Smw_Per_FOV:units = \"none\" ;                           |
|         |                                                            |
|         | N_Smw_Per_FOV:scale_factor = 1.0d ;                        |
|         |                                                            |
|         | N_Smw_Per_FOV:add_offset = 0.0d ;                          |
|         |                                                            |
|         | N_Smw_Per_FOV:parameter_type = \"IASI data\" ;             |
|         |                                                            |
|         | N_Smw_Per_FOV:valid_range = 1.0f, 16.0f ;                  |
|         |                                                            |
|         | N_Smw_Per_FOV:\_FillValue = -9999 ;                        |
|         |                                                            |
|         | long nemis_Per_FOV(Number_of_Dice) ;                       |
|         |                                                            |
|         | nemis_Per_FOV:long_name = \"Number of surface emis hinge   |
|         | points per AMSU FOV\" ;                                    |
|         |                                                            |
|         | nemis_Per_FOV:units = \"none\" ;                           |
|         |                                                            |
|         | nemis_Per_FOV:scale_factor = 1.0d ;                        |
|         |                                                            |
|         | nemis_Per_FOV:add_offset = 0.0d ;                          |
|         |                                                            |
|         | nemis_Per_FOV:parameter_type = \"IASI data\" ;             |
|         |                                                            |
|         | nemis_Per_FOV:valid_range = 1.0f, 100.0f ;                 |
|         |                                                            |
|         | nemis_Per_FOV:\_FillValue = -9999 ;                        |
|         |                                                            |
|         | long ncemis_Per_FOV(Number_of_Dice) ;                      |
|         |                                                            |
|         | ncemis_Per_FOV:long_name = \"Number of cloud emis hinge    |
|         | points per AMSU FOV\" ;                                    |
|         |                                                            |
|         | ncemis_Per_FOV:units = \"none\" ;                          |
|         |                                                            |
|         | ncemis_Per_FOV:scale_factor = 1.0d ;                       |
|         |                                                            |
|         | ncemis_Per_FOV:add_offset = 0.0d ;                         |
|         |                                                            |
|         | ncemis_Per_FOV:parameter_type = \"IASI data\" ;            |
|         |                                                            |
|         | ncemis_Per_FOV:valid_range = 1.0f, 100.0f ;                |
|         |                                                            |
|         | ncemis_Per_FOV:\_FillValue = -9999 ;                       |
|         |                                                            |
|         | long ncld_Per_FOV(Number_of_Dice) ;                        |
|         |                                                            |
|         | ncld_Per_FOV:long_name = \"Number of cloud layers per AMSU |
|         | FOV\" ;                                                    |
|         |                                                            |
|         | ncld_Per_FOV:units = \"none\" ;                            |
|         |                                                            |
|         | ncld_Per_FOV:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | ncld_Per_FOV:add_offset = 0.0d ;                           |
|         |                                                            |
|         | ncld_Per_FOV:parameter_type = \"IASI data\" ;              |
|         |                                                            |
|         | ncld_Per_FOV:valid_range = 1.0f, 8.0f ;                    |
|         |                                                            |
|         | ncld_Per_FOV:\_FillValue = -9999 ;                         |
|         |                                                            |
|         | long Quality_Flag(Number_of_Dice) ;                        |
|         |                                                            |
|         | Quality_Flag:long_name = \"Quality flags for retrieval\" ; |
|         |                                                            |
|         | Quality_Flag:units = \"none\" ;                            |
|         |                                                            |
|         | Quality_Flag:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | Quality_Flag:add_offset = 0.0d ;                           |
|         |                                                            |
|         | Quality_Flag:parameter_type = \"IASI data\" ;              |
|         |                                                            |
|         | Quality_Flag:valid_range = 0.f, 10000.f ;                  |
|         |                                                            |
|         | Quality_Flag:\_FillValue = -9999 ;                         |
|         |                                                            |
|         | float Cloud_Top_Pressure(Number_of_Dice,                   |
|         | Number_of_Cloud_Layers) ;                                  |
|         |                                                            |
|         | Cloud_Top_Pressure:long_name = \"Cloud top pressure\" ;    |
|         |                                                            |
|         | Cloud_Top_Pressure:units = \"mb\" ;                        |
|         |                                                            |
|         | Cloud_Top_Pressure:scale_factor = 1.0d ;                   |
|         |                                                            |
|         | Cloud_Top_Pressure:add_offset = 0.0d ;                     |
|         |                                                            |
|         | Cloud_Top_Pressure:parameter_type = \"IASI data\" ;        |
|         |                                                            |
|         | Cloud_Top_Pressure:valid_range = 0.f, 10000.f ;            |
|         |                                                            |
|         | Cloud_Top_Pressure:\_FillValue = -9999.f ;                 |
|         |                                                            |
|         | float Cloud_Top_Fraction(Number_of_Dice,                   |
|         | Number_of_Cloud_Layers) ;                                  |
|         |                                                            |
|         | Cloud_Top_Fraction:long_name = \"Cloud top fractional      |
|         | coverage\" ;                                               |
|         |                                                            |
|         | Cloud_Top_Fraction:units = \"none\" ;                      |
|         |                                                            |
|         | Cloud_Top_Fraction:scale_factor = 1.0d ;                   |
|         |                                                            |
|         | Cloud_Top_Fraction:add_offset = 0.0d ;                     |
|         |                                                            |
|         | Cloud_Top_Fraction:parameter_type = \"IASI data\" ;        |
|         |                                                            |
|         | Cloud_Top_Fraction:valid_range = 0.f, 1.f ;                |
|         |                                                            |
|         | Cloud_Top_Fraction:\_FillValue = -9999.f ;                 |
|         |                                                            |
|         | float Pressure(Number_of_Dice, Number_of_P_Levels) ;       |
|         |                                                            |
|         | Pressure:long_name = \"Pressure\" ;                        |
|         |                                                            |
|         | Pressure:units = \"mb\" ;                                  |
|         |                                                            |
|         | Pressure:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | Pressure:add_offset = 0.0d ;                               |
|         |                                                            |
|         | Pressure:parameter_type = \"IASI data\" ;                  |
|         |                                                            |
|         | Pressure:valid_range = 0.f, 2000.f ;                       |
|         |                                                            |
|         | Pressure:\_FillValue = -9999.f ;                           |
|         |                                                            |
|         | float Effective_Pressure(Number_of_Dice,                   |
|         | Number_of_P_Levels) ;                                      |
|         |                                                            |
|         | Effective_Pressure:long_name = \"Effective_Pressure\" ;    |
|         |                                                            |
|         | Effective_Pressure:units = \"mb\" ;                        |
|         |                                                            |
|         | Effective_Pressure:scale_factor = 1.0d ;                   |
|         |                                                            |
|         | Effective_Pressure:add_offset = 0.0d ;                     |
|         |                                                            |
|         | Effective_Pressure:parameter_type = \"IASI data\" ;        |
|         |                                                            |
|         | Effective_Pressure:valid_range = 0.f, 2000.f ;             |
|         |                                                            |
|         | Effective_Pressure:\_FillValue = -9999.f ;                 |
|         |                                                            |
|         | float Temperature(Number_of_Dice, Number_of_P_Levels) ;    |
|         |                                                            |
|         | Temperature:long_name = \"Temperature\" ;                  |
|         |                                                            |
|         | Temperature:units = \"Kelvin\" ;                           |
|         |                                                            |
|         | Temperature:scale_factor = 1.0d ;                          |
|         |                                                            |
|         | Temperature:add_offset = 0.0d ;                            |
|         |                                                            |
|         | Temperature:parameter_type = \"IASI data\" ;               |
|         |                                                            |
|         | Temperature:valid_range = 0.f, 1000.f ;                    |
|         |                                                            |
|         | Temperature:\_FillValue = -9999.f ;                        |
|         |                                                            |
|         | float H2O_LCD(Number_of_Dice, Number_of_P_Levels) ;        |
|         |                                                            |
|         | H2O_LCD:long_name = \"water vapor layer column density\" ; |
|         |                                                            |
|         | H2O_LCD:units = \"molecules/cm2\" ;                        |
|         |                                                            |
|         | H2O_LCD:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | H2O_LCD:add_offset = 0.0d ;                                |
|         |                                                            |
|         | H2O_LCD:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | H2O_LCD:valid_range = 0.f, 100000000.f ;                   |
|         |                                                            |
|         | H2O_LCD:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float H2O_MR(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | H2O_MR:long_name = \"water vapor mixing ratio\" ;          |
|         |                                                            |
|         | H2O_MR:units = \"g/g\" ;                                   |
|         |                                                            |
|         | H2O_MR:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | H2O_MR:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | H2O_MR:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | H2O_MR:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | H2O_MR:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float O3_LCD(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | O3_LCD:long_name = \"Ozone layer column density\" ;        |
|         |                                                            |
|         | O3_LCD:units = \"molecules/cm2\" ;                         |
|         |                                                            |
|         | O3_LCD:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | O3_LCD:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | O3_LCD:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | O3_LCD:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | O3_LCD:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float O3_MR(Number_of_Dice, Number_of_P_Levels) ;          |
|         |                                                            |
|         | O3_MR:long_name = \"Ozone mixing ratio\" ;                 |
|         |                                                            |
|         | O3_MR:units = \"ppb\" ;                                    |
|         |                                                            |
|         | O3_MR:scale_factor = 1.0d ;                                |
|         |                                                            |
|         | O3_MR:add_offset = 0.0d ;                                  |
|         |                                                            |
|         | O3_MR:parameter_type = \"IASI data\" ;                     |
|         |                                                            |
|         | O3_MR:valid_range = 0.f, 100000000.f ;                     |
|         |                                                            |
|         | O3_MR:\_FillValue = -9999.f ;                              |
|         |                                                            |
|         | float Liquid_H2O_LCD(Number_of_Dice, Number_of_P_Levels) ; |
|         |                                                            |
|         | Liquid_H2O_LCD:long_name = \"Liquid water layer column     |
|         | density\" ;                                                |
|         |                                                            |
|         | Liquid_H2O_LCD:units = \"molecules/cm2\" ;                 |
|         |                                                            |
|         | Liquid_H2O_LCD:scale_factor = 1.0d ;                       |
|         |                                                            |
|         | Liquid_H2O_LCD:add_offset = 0.0d ;                         |
|         |                                                            |
|         | Liquid_H2O_LCD:parameter_type = \"IASI data\" ;            |
|         |                                                            |
|         | Liquid_H2O_LCD:valid_range = 0.f, 100000000.f ;            |
|         |                                                            |
|         | Liquid_H2O_LCD:\_FillValue = -9999.f ;                     |
|         |                                                            |
|         | float Liquid_H2O_MR(Number_of_Dice, Number_of_P_Levels) ;  |
|         |                                                            |
|         | Liquid_H2O_MR:long_name = \"Liquid water mixing ratio\" ;  |
|         |                                                            |
|         | Liquid_H2O_MR:units = \"g/g\" ;                            |
|         |                                                            |
|         | Liquid_H2O_MR:scale_factor = 1.0d ;                        |
|         |                                                            |
|         | Liquid_H2O_MR:add_offset = 0.0d ;                          |
|         |                                                            |
|         | Liquid_H2O_MR:parameter_type = \"IASI data\" ;             |
|         |                                                            |
|         | Liquid_H2O_MR:valid_range = 0.f, 100000000.f ;             |
|         |                                                            |
|         | Liquid_H2O_MR:\_FillValue = -9999.f ;                      |
|         |                                                            |
|         | short Ice_Liquid_Flag(Number_of_Dice, Number_of_P_Levels)  |
|         | ;                                                          |
|         |                                                            |
|         | Ice_Liquid_Flag:long_name = \"Ice liquid flag 0=water,     |
|         | 1=ice\" ;                                                  |
|         |                                                            |
|         | Ice_Liquid_Flag:units = \"none\" ;                         |
|         |                                                            |
|         | Ice_Liquid_Flag:scale_factor = 1 ;                         |
|         |                                                            |
|         | Ice_Liquid_Flag:add_offset = 0 ;                           |
|         |                                                            |
|         | Ice_Liquid_Flag:parameter_type = \"IASI data\" ;           |
|         |                                                            |
|         | Ice_Liquid_Flag:valid_range = 0, 1 ;                       |
|         |                                                            |
|         | Ice_Liquid_Flag:\_FillValue = -9999s ;                     |
|         |                                                            |
|         | float CO_LCD(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | CO_LCD:long_name = \"Carbon monoxide layer column          |
|         | density\" ;                                                |
|         |                                                            |
|         | CO_LCD:units = \"molecules/cm2\" ;                         |
|         |                                                            |
|         | CO_LCD:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | CO_LCD:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | CO_LCD:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | CO_LCD:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | CO_LCD:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float CO_MR(Number_of_Dice, Number_of_P_Levels) ;          |
|         |                                                            |
|         | CO_MR:long_name = \"Carbon monoxide mixing ratio\" ;       |
|         |                                                            |
|         | CO_MR:units = \"ppb\" ;                                    |
|         |                                                            |
|         | CO_MR:scale_factor = 1.0d ;                                |
|         |                                                            |
|         | CO_MR:add_offset = 0.0d ;                                  |
|         |                                                            |
|         | CO_MR:parameter_type = \"IASI data\" ;                     |
|         |                                                            |
|         | CO_MR:valid_range = 0.f, 100000000.f ;                     |
|         |                                                            |
|         | CO_MR:\_FillValue = -9999.f ;                              |
|         |                                                            |
|         | float CH4_LCD(Number_of_Dice, Number_of_P_Levels) ;        |
|         |                                                            |
|         | CH4_LCD:long_name = \"Methane layer column density\" ;     |
|         |                                                            |
|         | CH4_LCD:units = \"molecules/cm2\" ;                        |
|         |                                                            |
|         | CH4_LCD:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | CH4_LCD:add_offset = 0.0d ;                                |
|         |                                                            |
|         | CH4_LCD:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | CH4_LCD:valid_range = 0.f, 100000000.f ;                   |
|         |                                                            |
|         | CH4_LCD:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float CH4_MR(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | CH4_MR:long_name = \"Methane mixing ratio\" ;              |
|         |                                                            |
|         | CH4_MR:units = \"ppb\" ;                                   |
|         |                                                            |
|         | CH4_MR:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | CH4_MR:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | CH4_MR:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | CH4_MR:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | CH4_MR:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float CO2(Number_of_Dice, Number_of_P_Levels) ;            |
|         |                                                            |
|         | CO2:long_name = \"Carbon dioxide dry mixing ratio\" ;      |
|         |                                                            |
|         | CO2:units = \"ppm\" ;                                      |
|         |                                                            |
|         | CO2:scale_factor = 1.0d ;                                  |
|         |                                                            |
|         | CO2:add_offset = 0.0d ;                                    |
|         |                                                            |
|         | CO2:parameter_type = \"IASI data\" ;                       |
|         |                                                            |
|         | CO2:valid_range = 0.f, 1000.f ;                            |
|         |                                                            |
|         | CO2:\_FillValue = -9999.f ;                                |
|         |                                                            |
|         | float HNO3_LCD(Number_of_Dice, Number_of_P_Levels) ;       |
|         |                                                            |
|         | HNO3_LCD:long_name = \"Nitric Acid layer column density\"  |
|         | ;                                                          |
|         |                                                            |
|         | HNO3_LCD:units = \"molecules/cm2\" ;                       |
|         |                                                            |
|         | HNO3_LCD:scale_factor = 1.0d ;                             |
|         |                                                            |
|         | HNO3_LCD:add_offset = 0.0d ;                               |
|         |                                                            |
|         | HNO3_LCD:parameter_type = \"IASI data\" ;                  |
|         |                                                            |
|         | HNO3_LCD:valid_range = 0.f, 100000000.f ;                  |
|         |                                                            |
|         | HNO3_LCD:\_FillValue = -9999.f ;                           |
|         |                                                            |
|         | float HNO3_MR(Number_of_Dice, Number_of_P_Levels) ;        |
|         |                                                            |
|         | HNO3_MR:long_name = \"Nitric Acid mixing ratio\" ;         |
|         |                                                            |
|         | HNO3_MR:units = \"ppb\" ;                                  |
|         |                                                            |
|         | HNO3_MR:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | HNO3_MR:add_offset = 0.0d ;                                |
|         |                                                            |
|         | HNO3_MR:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | HNO3_MR:valid_range = 0.f, 100000000.f ;                   |
|         |                                                            |
|         | HNO3_MR:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float N2O_LCD(Number_of_Dice, Number_of_P_Levels) ;        |
|         |                                                            |
|         | N2O_LCD:long_name = \"Nitrous Oxide layer column density\" |
|         | ;                                                          |
|         |                                                            |
|         | N2O_LCD:units = \"molecules/cm2\" ;                        |
|         |                                                            |
|         | N2O_LCD:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | N2O_LCD:add_offset = 0.0d ;                                |
|         |                                                            |
|         | N2O_LCD:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | N2O_LCD:valid_range = 0.f, 100000000.f ;                   |
|         |                                                            |
|         | N2O_LCD:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float N2O_MR(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | N2O_MR:long_name = \"Nitrous Oxide mixing ratio\" ;        |
|         |                                                            |
|         | N2O_MR:units = \"ppb\" ;                                   |
|         |                                                            |
|         | N2O_MR:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | N2O_MR:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | N2O_MR:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | N2O_MR:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | N2O_MR:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float SO2_LCD(Number_of_Dice, Number_of_P_Levels) ;        |
|         |                                                            |
|         | SO2_LCD:long_name = \"Sulfur Dioxide layer column          |
|         | density\" ;                                                |
|         |                                                            |
|         | SO2_LCD:units = \"molecules/cm2\" ;                        |
|         |                                                            |
|         | SO2_LCD:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | SO2_LCD:add_offset = 0.0d ;                                |
|         |                                                            |
|         | SO2_LCD:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | SO2_LCD:valid_range = 0.f, 100000000.f ;                   |
|         |                                                            |
|         | SO2_LCD:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float SO2_MR(Number_of_Dice, Number_of_P_Levels) ;         |
|         |                                                            |
|         | SO2_MR:long_name = \"Sulfur Dioxide mixing ratio\" ;       |
|         |                                                            |
|         | SO2_MR:units = \"ppb\" ;                                   |
|         |                                                            |
|         | SO2_MR:scale_factor = 1.0d ;                               |
|         |                                                            |
|         | SO2_MR:add_offset = 0.0d ;                                 |
|         |                                                            |
|         | SO2_MR:parameter_type = \"IASI data\" ;                    |
|         |                                                            |
|         | SO2_MR:valid_range = 0.f, 100000000.f ;                    |
|         |                                                            |
|         | SO2_MR:\_FillValue = -9999.f ;                             |
|         |                                                            |
|         | float MW_Frequency(Number_of_Dice,                         |
|         | Number_of_MW_Spectral_Pts) ;                               |
|         |                                                            |
|         | MW_Frequency:long_name = \"Microwave frequency\" ;         |
|         |                                                            |
|         | MW_Frequency:units = \"wavenumber cm-1\" ;                 |
|         |                                                            |
|         | MW_Frequency:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | MW_Frequency:add_offset = 0.0d ;                           |
|         |                                                            |
|         | MW_Frequency:parameter_type = \"IASI data\" ;              |
|         |                                                            |
|         | MW_Frequency:valid_range = 0.f, 10000.f ;                  |
|         |                                                            |
|         | MW_Frequency:\_FillValue = -9999.f ;                       |
|         |                                                            |
|         | float MW_Emis(Number_of_Dice, Number_of_MW_Spectral_Pts) ; |
|         |                                                            |
|         | MW_Emis:long_name = \"Microwave emissivity\" ;             |
|         |                                                            |
|         | MW_Emis:units = \"none\" ;                                 |
|         |                                                            |
|         | MW_Emis:scale_factor = 1.0d ;                              |
|         |                                                            |
|         | MW_Emis:add_offset = 0.0d ;                                |
|         |                                                            |
|         | MW_Emis:parameter_type = \"IASI data\" ;                   |
|         |                                                            |
|         | MW_Emis:valid_range = 0.f, 1.f ;                           |
|         |                                                            |
|         | MW_Emis:\_FillValue = -9999.f ;                            |
|         |                                                            |
|         | float IR_Emis_Freq(Number_of_Dice,                         |
|         | Number_of_Surf_Emis_Hinge_Pts) ;                           |
|         |                                                            |
|         | IR_Emis_Freq:long_name = \"IR emissivity hinge point       |
|         | frequencies\" ;                                            |
|         |                                                            |
|         | IR_Emis_Freq:units = \"wavenumber cm-1\" ;                 |
|         |                                                            |
|         | IR_Emis_Freq:scale_factor = 1.0d ;                         |
|         |                                                            |
|         | IR_Emis_Freq:add_offset = 0.0d ;                           |
|         |                                                            |
|         | IR_Emis_Freq:parameter_type = \"IASI data\" ;              |
|         |                                                            |
|         | IR_Emis_Freq:valid_range = 0.f, 10000.f ;                  |
|         |                                                            |
|         | IR_Emis_Freq:\_FillValue = -9999.f ;                       |
|         |                                                            |
|         | float IR_Surface_Emis(Number_of_Dice,                      |
|         | Number_of_Surf_Emis_Hinge_Pts) ;                           |
|         |                                                            |
|         | IR_Surface_Emis:long_name = \"IR surface emissivity\" ;    |
|         |                                                            |
|         | IR_Surface_Emis:units = \"none\" ;                         |
|         |                                                            |
|         | IR_Surface_Emis:scale_factor = 1.0d ;                      |
|         |                                                            |
|         | IR_Surface_Emis:add_offset = 0.0d ;                        |
|         |                                                            |
|         | IR_Surface_Emis:parameter_type = \"IASI data\" ;           |
|         |                                                            |
|         | IR_Surface_Emis:valid_range = 0.f, 1.f ;                   |
|         |                                                            |
|         | IR_Surface_Emis:\_FillValue = -9999.f ;                    |
|         |                                                            |
|         | float IR_Surface_Refl(Number_of_Dice,                      |
|         | Number_of_Surf_Emis_Hinge_Pts) ;                           |
|         |                                                            |
|         | IR_Surface_Refl:long_name = \"IR surface reflectance\" ;   |
|         |                                                            |
|         | IR_Surface_Refl:units = \"percent\" ;                      |
|         |                                                            |
|         | IR_Surface_Refl:scale_factor = 1.0d ;                      |
|         |                                                            |
|         | IR_Surface_Refl:add_offset = 0.0d ;                        |
|         |                                                            |
|         | IR_Surface_Refl:parameter_type = \"IASI data\" ;           |
|         |                                                            |
|         | IR_Surface_Refl:valid_range = 0.f, 100.f ;                 |
|         |                                                            |
|         | IR_Surface_Refl:\_FillValue = -9999.f ;                    |
|         |                                                            |
|         | float Stability(Number_of_Dice,                            |
|         | Number_of_Stability_Parameters) ;                          |
|         |                                                            |
|         | Stability:long_name = \"Stability parameters\" ;           |
|         |                                                            |
|         | Stability:units = \"varying\" ;                            |
|         |                                                            |
|         | Stability:scale_factor = 1.0d ;                            |
|         |                                                            |
|         | Stability:add_offset = 0.0d ;                              |
|         |                                                            |
|         | Stability:parameter_type = \"IASI data\" ;                 |
|         |                                                            |
|         | Stability:valid_range = 0.f, 1000000.f ;                   |
|         |                                                            |
|         | Stability:\_FillValue = -9999.f ;                          |
|         |                                                            |
|         | float Cloud_Freq(Number_of_Dice, Number_of_Cloud_Layers,   |
|         | Number_of_Cloud_Emis_Hing_Pts) ;                           |
|         |                                                            |
|         | Cloud_Freq:long_name = \"Cloud IR frequencies\" ;          |
|         |                                                            |
|         | Cloud_Freq:units = \"wavenumber cm-1\" ;                   |
|         |                                                            |
|         | Cloud_Freq:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | Cloud_Freq:add_offset = 0.0d ;                             |
|         |                                                            |
|         | Cloud_Freq:parameter_type = \"IASI data\" ;                |
|         |                                                            |
|         | Cloud_Freq:valid_range = 0.f, 10000.f ;                    |
|         |                                                            |
|         | Cloud_Freq:\_FillValue = -9999.f ;                         |
|         |                                                            |
|         | float Cloud_Emis(Number_of_Dice, Number_of_Cloud_Layers,   |
|         | Number_of_Cloud_Emis_Hing_Pts) ;                           |
|         |                                                            |
|         | Cloud_Emis:long_name = \"Cloud IR emissivity\" ;           |
|         |                                                            |
|         | Cloud_Emis:units = \"none\" ;                              |
|         |                                                            |
|         | Cloud_Emis:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | Cloud_Emis:add_offset = 0.0d ;                             |
|         |                                                            |
|         | Cloud_Emis:parameter_type = \"IASI data\" ;                |
|         |                                                            |
|         | Cloud_Emis:valid_range = 0.f, 1.f ;                        |
|         |                                                            |
|         | Cloud_Emis:\_FillValue = -9999.f ;                         |
|         |                                                            |
|         | float Cloud_Refl(Number_of_Dice, Number_of_Cloud_Layers,   |
|         | Number_of_Cloud_Emis_Hing_Pts) ;                           |
|         |                                                            |
|         | Cloud_Refl:long_name = \"Cloud IR reflectivity\" ;         |
|         |                                                            |
|         | Cloud_Refl:units = \"percent\" ;                           |
|         |                                                            |
|         | Cloud_Refl:scale_factor = 1.0d ;                           |
|         |                                                            |
|         | Cloud_Refl:add_offset = 0.0d ;                             |
|         |                                                            |
|         | Cloud_Refl:parameter_type = \"IASI data\" ;                |
|         |                                                            |
|         | Cloud_Refl:valid_range = 0.f, 100.f ;                      |
|         |                                                            |
|         | Cloud_Refl:\_FillValue = -9999.f ;                         |
+---------+------------------------------------------------------------+

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

These files reside in the level2 products directory for the given
granule:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

These files are sent to the DDS where they are retrieved by CLASS. The
details of the archiving of the L2 and CCR products are described in a
data submission agreement separate from the level 1C products called The
Producer Archive Submission Agreement for IASI L2 Products
(NESDIS/CLASS, 2008).

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## **IASI CCR NetCDF File**

### Purpose

Products files which are defined as any output files whose contents are
used to satisfy user requirements. These files will be archived to
Comprehensive Large Array-data Stewardship System (CLASS).

### Data File Description

The IASICCR NetCDF granule files are generated from
*main_iasi_ccr_to_netcdf*. The input files are the native binary format
retrieval output files. This program is part of the L2 Processing Unit.
The files they create are produced in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

The following NetCDF intermediate file is produced for each granule with
the following name structure.

iasi_ccr\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

iasi_ccr_ncep\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

where:

\$Year = 4-digit year

\$Month = 2-digit month

\$Day = 2-digit day

\$Granule_Number = 3-digit granule number

The first file is full spatial and spectral resolution file. It's
starting and ending scan lines and footprints match those of the full
resolution Level 1C IASI, AMSU-A, and MHS L1B NetCDF files for the same
granule number described above. The "iasi_ccr_ncep" file:

iasi_ccr_ncep\_\${Year}\${Month}\${Day}\_Granule-\${Granule_Number}.nc

is required for the generation of CCR BUFR files. The other file is used
in both the Global Grids and Global Binaries units. It is also used to
generate additional NetCDF file which is archived to CLASS:

IASI_CCR_M02_V\${YYMMDD}\_\${YYYYMODDHHMMSS}Z\_\${YYYYMODDHHMMSS}Z.nc

where:

IASI = Instrument name

CCR = the product type (CCR = Cloud-cleared radiances)

M02 = Satellite ID (M02 = Metop-A)

V = Version indicator

\$YYMMDD = 2-digit year + 2-digit month + 2-digit day (the date the
version was created)

Sensing date/time string = Date/time of observations given in the
following format YYYYMODDHHMMSSZ. The first string indicates the
starting date/time and the second string indicates the ending date/time.

nc = File type extension indicates NetCDF format

Where:

The string "YYYYMODDHHMMSSZ" is a date string containing the following
components of time:

YYYY = 4 digit year (e.g. 2005)

MO = 2 digit month (01-12)

DD = day of month (01-31)

HH = hour (00-23)

MM = minute (00-59)

SS = seconds (00-59)

Z = Greenwich Mean Time (GMT)

Here is an example of a CCR file created using software version 071016
on February 11^th^, 2008. The granule starts at 04:23:59 GMT and ends at
04:26:55 GMT:

IASI_CCR_M02_V071016_20080211042359Z_20080211042655Z.nc

This granule file has an associated metadata xml file which is archived
to CLASS.

Table 39. IASI CCR NetCDF Header

+------+---------------------------------------------------------------+
| dim  | Number_of_Dice = 660 ; // Number dice written                 |
| ensi |                                                               |
| ons: | Number_of_Dots = 1 ; // Number of IASI FOVS in a die          |
|      |                                                               |
| va   | Number_of_IASI_Channels = 8461 ; // Number of IASI Channels   |
| riab |                                                               |
| les: | Number_of_IASI_Frequencies = 8461 ; // Number of IASI Clear   |
|      | Frequencies                                                   |
|      |                                                               |
|      | Number_of_AVHRR_Channels = 6; // Number of AVHRR channels     |
|      |                                                               |
|      | Number_of_AVHRR_FOV_Classes = 7; // Number of AVHRR sounder   |
|      | FOV classes                                                   |
|      |                                                               |
|      | Number_of_AVHRR_Frequencies = 6;                              |
|      |                                                               |
|      | Number_of_IASI_Image_Pixels = 4096; // 64 X 64 Pixel IASI     |
|      | image                                                         |
|      |                                                               |
|      | long IASI_Channels(Number_of_IASI_Channels) ;                 |
|      |                                                               |
|      | IASI_Channels:long_name = \"Channel number for data\" ;       |
|      |                                                               |
|      | IASI_Channels:units = \"none\" ;                              |
|      |                                                               |
|      | IASI_Channels:scale_factor = 1.0d ;                           |
|      |                                                               |
|      | IASI_Channels:add_offset = 0.0d ;                             |
|      |                                                               |
|      | IASI_Channels:parameter_type = \"IASI data\" ;                |
|      |                                                               |
|      | IASI_Channels:valid_range = 1.0f, 8461.0f ;                   |
|      |                                                               |
|      | IASI_Channels:\_FillValue = -9999 ;                           |
|      |                                                               |
|      | float IASI_Frequencies(Number_of_IASI_Frequencies) ;          |
|      |                                                               |
|      | IASI_Frequencies:long_name = \"Frequency at which the data is |
|      | taken\" ;                                                     |
|      |                                                               |
|      | IASI_Frequencies:units = \"wavenumber cm-1\" ;                |
|      |                                                               |
|      | IASI_Frequencies:scale_factor = 1.0d ;                        |
|      |                                                               |
|      | IASI_Frequencies:add_offset = 0.0d ;                          |
|      |                                                               |
|      | IASI_Frequencies:parameter_type = \"IASI data\" ;             |
|      |                                                               |
|      | IASI_Frequencies:valid_range = 0.0f, 10000.0f ;               |
|      |                                                               |
|      | IASI_Frequencies:\_FillValue = -9999.0f ;                     |
|      |                                                               |
|      | long AVHRR_Channels(Number_of_AVHRR_Channels) ;               |
|      |                                                               |
|      | AVHRR_Channels:long_name = \"Channel number for data\" ;      |
|      |                                                               |
|      | AVHRR_Channels:units = \"none\" ;                             |
|      |                                                               |
|      | AVHRR_Channels:scale_factor = 1.0d ;                          |
|      |                                                               |
|      | AVHRR_Channels:add_offset = 0.0d ;                            |
|      |                                                               |
|      | AVHRR_Channels:parameter_type = \"AVHRR data\" ;              |
|      |                                                               |
|      | AVHRR_Channels:valid_range = 1.0f, 6.0f ;                     |
|      |                                                               |
|      | AVHRR_Channels:\_FillValue = -9999 ;                          |
|      |                                                               |
|      | float AVHRR_Frequencies(Number_of_AVHRR_Frequencies) ;        |
|      |                                                               |
|      | AVHRR_Frequencies:long_name = \"Frequency at which the data   |
|      | is taken\" ;                                                  |
|      |                                                               |
|      | AVHRR_Frequencies:units = \"wavenumber cm-1\" ;               |
|      |                                                               |
|      | AVHRR_Frequencies:scale_factor = 1.0d ;                       |
|      |                                                               |
|      | AVHRR_Frequencies:add_offset = 0.0d ;                         |
|      |                                                               |
|      | AVHRR_Frequencies:parameter_type = \"AVHRR data\" ;           |
|      |                                                               |
|      | AVHRR_Frequencies:valid_range = 0.0f, 16000.0f ;              |
|      |                                                               |
|      | AVHRR_Frequencies:\_FillValue = -9999.0f ;                    |
|      |                                                               |
|      | long AVHRR_FOV_Classes(Number_of_AVHRR_FOV_Classes) ;         |
|      |                                                               |
|      | AVHRR_FOV_Classes:long_name = \"The index of the AVHRR FOV    |
|      | sounder class\" ;                                             |
|      |                                                               |
|      | AVHRR_FOV_Classes:units = \"none\" ;                          |
|      |                                                               |
|      | AVHRR_FOV_Classes:scale_factor = 1.0d ;                       |
|      |                                                               |
|      | AVHRR_FOV_Classes:add_offset = 0.0d ;                         |
|      |                                                               |
|      | AVHRR_FOV_Classes:parameter_type = \"AVHRR data\" ;           |
|      |                                                               |
|      | AVHRR_FOV_Classes:valid_range = 1.0f, 7.0f ;                  |
|      |                                                               |
|      | AVHRR_FOV_Classes:\_FillValue = -9999 ;                       |
|      |                                                               |
|      | long Dice(Number_of_Dice) ;                                   |
|      |                                                               |
|      | Dice:long_name = \"The index of the IASI fields of regard\" ; |
|      |                                                               |
|      | Dice:units = \"none\" ;                                       |
|      |                                                               |
|      | Dice:scale_factor = 1.0d ;                                    |
|      |                                                               |
|      | Dice:add_offset = 0.0d ;                                      |
|      |                                                               |
|      | Dice:parameter_type = \"IASI data\" ;                         |
|      |                                                               |
|      | Dice:valid_range = 1.0f, 660.0f ;                             |
|      |                                                               |
|      | Dice:\_FillValue = -9999 ;                                    |
|      |                                                               |
|      | long Dots(Number_of_Dots) ;                                   |
|      |                                                               |
|      | Dots:long_name = \"The index of the IASI fields of view\" ;   |
|      |                                                               |
|      | Dots:units = \"none\" ;                                       |
|      |                                                               |
|      | Dots:scale_factor = 1.0d ;                                    |
|      |                                                               |
|      | Dots:add_offset = 0.0d ;                                      |
|      |                                                               |
|      | Dots:parameter_type = \"IASI data\" ;                         |
|      |                                                               |
|      | Dots:valid_range = 1.0f, 4.0f ;                               |
|      |                                                               |
|      | Dots:\_FillValue = -9999 ;                                    |
|      |                                                               |
|      | long Scan_Line(Number_of_Dice,Number_of_Dots) ;               |
|      |                                                               |
|      | Scan_Line:long_name = \"The number of the current scan line\" |
|      | ;                                                             |
|      |                                                               |
|      | Scan_Line:units = \"none\" ;                                  |
|      |                                                               |
|      | Scan_Line:scale_factor = 1.0d ;                               |
|      |                                                               |
|      | Scan_Line:add_offset = 0.0d ;                                 |
|      |                                                               |
|      | Scan_Line:parameter_type = \"IASI data\" ;                    |
|      |                                                               |
|      | Scan_Line:valid_range = 1.0f, 22.0f ;                         |
|      |                                                               |
|      | Scan_Line:\_FillValue = -9999 ;                               |
|      |                                                               |
|      | long AMSU_FOV(Number_of_Dice,Number_of_Dots) ;                |
|      |                                                               |
|      | AMSU_FOV:long_name = \"The number of the current AMSU FOV\" ; |
|      |                                                               |
|      | AMSU_FOV:units = \"none\" ;                                   |
|      |                                                               |
|      | AMSU_FOV:scale_factor = 1.0d ;                                |
|      |                                                               |
|      | AMSU_FOV:add_offset = 0.0d ;                                  |
|      |                                                               |
|      | AMSU_FOV:parameter_type = \"IASI data\" ;                     |
|      |                                                               |
|      | AMSU_FOV:valid_range = 1.0f, 30.0f ;                          |
|      |                                                               |
|      | AMSU_FOV:\_FillValue = -9999 ;                                |
|      |                                                               |
|      | long IASI_FOV(Number_of_Dice,Number_of_Dots) ;                |
|      |                                                               |
|      | IASI_FOV:long_name = \"The number of the current IASI FOV\" ; |
|      |                                                               |
|      | IASI_FOV:units = \"none\" ;                                   |
|      |                                                               |
|      | IASI_FOV:scale_factor = 1.0d ;                                |
|      |                                                               |
|      | IASI_FOV:add_offset = 0.0d ;                                  |
|      |                                                               |
|      | IASI_FOV:parameter_type = \"IASI data\" ;                     |
|      |                                                               |
|      | IASI_FOV:valid_range = 1.0f, 4.0f ;                           |
|      |                                                               |
|      | IASI_FOV:\_FillValue = -9999 ;                                |
|      |                                                               |
|      | short GQisFlagQual(Number_of_Dice,Number_of_Dots) ;           |
|      |                                                               |
|      | GQisFlagQual:long_name = \"System QC flag\" ;                 |
|      |                                                               |
|      | GQisFlagQual:units = \"none\" ;                               |
|      |                                                               |
|      | GQisFlagQual:scale_factor = 1 ;                               |
|      |                                                               |
|      | GQisFlagQual:add_offset = 0 ;                                 |
|      |                                                               |
|      | GQisFlagQual:parameter_type = \"IASI data\" ;                 |
|      |                                                               |
|      | GQisFlagQual:valid_range = 0, 1 ;                             |
|      |                                                               |
|      | GQisFlagQual:\_FillValue = -9999s ;                           |
|      |                                                               |
|      | float GQisQualIndex(Number_of_Dice,Number_of_Dots) ;          |
|      |                                                               |
|      | GQisQualIndex:long_name = \"System QC flag\" ;                |
|      |                                                               |
|      | GQisQualIndex:units = \"none\" ;                              |
|      |                                                               |
|      | GQisQualIndex:scale_factor = 1.0d ;                           |
|      |                                                               |
|      | GQisQualIndex:add_offset = 0.0d ;                             |
|      |                                                               |
|      | GQisQualIndex:parameter_type = \"IASI data\" ;                |
|      |                                                               |
|      | GQisQualIndex:valid_range = 0.0f, 9999.0f ;                   |
|      |                                                               |
|      | GQisQualIndex:\_FillValue = -9999.0f ;                        |
|      |                                                               |
|      | float GQisQualIndexLoc(Number_of_Dice,Number_of_Dots) ;       |
|      |                                                               |
|      | GQisQualIndexLoc:long_name = \"System QC flag\" ;             |
|      |                                                               |
|      | GQisQualIndexLoc:units = \"none\" ;                           |
|      |                                                               |
|      | GQisQualIndexLoc:scale_factor = 1.0d ;                        |
|      |                                                               |
|      | GQisQualIndexLoc:add_offset = 0.0d ;                          |
|      |                                                               |
|      | GQisQualIndexLoc:parameter_type = \"IASI data\" ;             |
|      |                                                               |
|      | GQisQualIndexLoc:valid_range = 0.0f, 9999.0f ;                |
|      |                                                               |
|      | GQisQualIndexLoc:\_FillValue = -9999.0f ;                     |
|      |                                                               |
|      | float GQisQualIndexRad(Number_of_Dice,Number_of_Dots) ;       |
|      |                                                               |
|      | GQisQualIndexRad:long_name = \"System QC flag\" ;             |
|      |                                                               |
|      | GQisQualIndexRad:units = \"none\" ;                           |
|      |                                                               |
|      | GQisQualIndexRad:scale_factor = 1.0d ;                        |
|      |                                                               |
|      | GQisQualIndexRad:add_offset = 0.0d ;                          |
|      |                                                               |
|      | GQisQualIndexRad:parameter_type = \"IASI data\" ;             |
|      |                                                               |
|      | GQisQualIndexRad:valid_range = 0.0f, 9999.0f ;                |
|      |                                                               |
|      | GQisQualIndexRad:\_FillValue = -9999.0f ;                     |
|      |                                                               |
|      | float GQisQualIndexSpect(Number_of_Dice,Number_of_Dots) ;     |
|      |                                                               |
|      | GQisQualIndexSpect:long_name = \"System QC flag\" ;           |
|      |                                                               |
|      | GQisQualIndexSpect:units = \"none\" ;                         |
|      |                                                               |
|      | GQisQualIndexSpect:scale_factor = 1.0d ;                      |
|      |                                                               |
|      | GQisQualIndexSpect:add_offset = 0.0d ;                        |
|      |                                                               |
|      | GQisQualIndexSpect:parameter_type = \"IASI data\" ;           |
|      |                                                               |
|      | GQisQualIndexSpect:valid_range = 0.0f, 9999.0f ;              |
|      |                                                               |
|      | GQisQualIndexSpect:\_FillValue = -9999.0f ;                   |
|      |                                                               |
|      | float GQisSysTecSondQual(Number_of_Dice,Number_of_Dots) ;     |
|      |                                                               |
|      | GQisSysTecSondQual:long_name = \"System QC flag\" ;           |
|      |                                                               |
|      | GQisSysTecSondQual:units = \"none\" ;                         |
|      |                                                               |
|      | GQisSysTecSondQual:scale_factor = 1.0d ;                      |
|      |                                                               |
|      | GQisSysTecSondQual:add_offset = 0.0d ;                        |
|      |                                                               |
|      | GQisSysTecSondQual:parameter_type = \"IASI data\" ;           |
|      |                                                               |
|      | GQisSysTecSondQual:valid_range = 0.0f, 9999.0f ;              |
|      |                                                               |
|      | GQisSysTecSondQual:\_FillValue = -9999.0f ;                   |
|      |                                                               |
|      | double Time(Number_of_Dice,Number_of_Dots) ;                  |
|      |                                                               |
|      | Time:long_name = \"UTC Milliseconds since Jan 1, 1970\" ;     |
|      |                                                               |
|      | Time:units = \"msec\" ;                                       |
|      |                                                               |
|      | Time:scale_factor = 1.0d ;                                    |
|      |                                                               |
|      | Time:add_offset = 0.0d ;                                      |
|      |                                                               |
|      | Time:parameter_type = \"IASI data\" ;                         |
|      |                                                               |
|      | Time:valid_range = 0.0f, 1577836800000.0f ;                   |
|      |                                                               |
|      | Time:\_FillValue = -9999.0 ;                                  |
|      |                                                               |
|      | float Latitude(Number_of_Dice,Number_of_Dots) ;               |
|      |                                                               |
|      | Latitude:long_name = \"IASI Latitude values for each FOV\" ;  |
|      |                                                               |
|      | Latitude:units = \"degrees North\" ;                          |
|      |                                                               |
|      | Latitude:scale_factor = 1.0d ;                                |
|      |                                                               |
|      | Latitude:add_offset = 0.0d ;                                  |
|      |                                                               |
|      | Latitude:parameter_type = \"IASI data\" ;                     |
|      |                                                               |
|      | Latitude:valid_range = 90.0f, -90.0f ;                        |
|      |                                                               |
|      | Latitude:\_FillValue = -9999.0f ;                             |
|      |                                                               |
|      | float Longitude(Number_of_Dice,Number_of_Dots) ;              |
|      |                                                               |
|      | Longitude:long_name = \"IASI Longitude values for each FOV\"  |
|      | ;                                                             |
|      |                                                               |
|      | Longitude:units = \"degrees East\" ;                          |
|      |                                                               |
|      | Longitude:scale_factor = 1.0d ;                               |
|      |                                                               |
|      | Longitude:add_offset = 0.0d ;                                 |
|      |                                                               |
|      | Longitude:parameter_type = \"IASI data\" ;                    |
|      |                                                               |
|      | Longitude:valid_range = -180.0f, 179.99f ;                    |
|      |                                                               |
|      | Longitude:\_FillValue = -9999.0f ;                            |
|      |                                                               |
|      | float                                                         |
|      | IASI_Rad                                                      |
|      | iances(Number_of_Dice,Number_of_Dots,Number_of_IASI_Channels) |
|      | ;                                                             |
|      |                                                               |
|      | IASI_Radiances:long_name = \"IASI Radiances for each FOV\" ;  |
|      |                                                               |
|      | IASI_Radiances:units = \"mW/m2/cm-1/sr\" ;                    |
|      |                                                               |
|      | IASI_Radiances:scale_factor = 1.0d ;                          |
|      |                                                               |
|      | IASI_Radiances:add_offset = 0.0d ;                            |
|      |                                                               |
|      | IASI_Radiances:parameter_type = \"IASI data\" ;               |
|      |                                                               |
|      | IASI_Radiances:valid_range = 0.0f, 40000.0f ;                 |
|      |                                                               |
|      | IASI_Radiances:\_FillValue = -9999.0f ;                       |
|      |                                                               |
|      | float IASI_Image(Number_of_Dice,Number_of_IASI_Image_Pixels)  |
|      | ;                                                             |
|      |                                                               |
|      | IASI_Image:long_name = \"IASI Image for each FOR\" ;          |
|      |                                                               |
|      | IASI_Image:units = \"mW/m2/cm-1/sr\" ;                        |
|      |                                                               |
|      | IASI_Image:scale_factor = 1.0d ;                              |
|      |                                                               |
|      | IASI_Image:add_offset = 0.0d ;                                |
|      |                                                               |
|      | IASI_Image:parameter_type = \"IASI data\" ;                   |
|      |                                                               |
|      | IASI_Image:valid_range = 0.0f, 40000.0f ;                     |
|      |                                                               |
|      | IASI_Image:\_FillValue = -9999.0f ;                           |
|      |                                                               |
|      | short AVHRR_Channel_Combo(Number_of_Dice,Number_of_Dots) ;    |
|      |                                                               |
|      | AVHRR_Channel_Combo:long_name = \"AVHRR Channels used in      |
|      | radiance analysis\" ;                                         |
|      |                                                               |
|      | AVHRR_Channel_Combo:units = \"none\" ;                        |
|      |                                                               |
|      | AVHRR_Channel_Combo:scale_factor = 1 ;                        |
|      |                                                               |
|      | AVHRR_Channel_Combo:add_offset = 0 ;                          |
|      |                                                               |
|      | AVHRR_Channel_Combo:parameter_type = \"IASI data\" ;          |
|      |                                                               |
|      | AVHRR_Channel_Combo:valid_range = 0, 1 ;                      |
|      |                                                               |
|      | AVHRR_Channel_Combo:\_FillValue = -9999s ;                    |
|      |                                                               |
|      | float                                                         |
|      | Fraction_of_Clear_AVH                                         |
|      | RR(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|      | ;                                                             |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:long_name = \"Percent clear for each  |
|      | AVHRR FOV class\" ;                                           |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:units = \"%\" ;                       |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:scale_factor = 1.0d ;                 |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:add_offset = 0.0d ;                   |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:parameter_type = \"AVHRR data\" ;     |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:valid_range = 0.0f, 100.0f ;          |
|      |                                                               |
|      | Fraction_of_Clear_AVHRR:\_FillValue = -9999.0f ;              |
|      |                                                               |
|      | float                                                         |
|      | AVHRR_Y_Angle_Center_of_Gravi                                 |
|      | ty(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|      | ;                                                             |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:long_name = \"Y angular       |
|      | position of the center of gravity\" ;                         |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:units = \"degrees\" ;         |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:scale_factor = 1.0d ;         |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:add_offset = 0.0d ;           |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:parameter_type = \"AVHRR      |
|      | data\" ;                                                      |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:valid_range = 0.0f, 360.0f ;  |
|      |                                                               |
|      | AVHRR_Y_Angle_Center_of_Gravity:\_FillValue = -9999.0f ;      |
|      |                                                               |
|      | float                                                         |
|      | AVHRR_Z_Angle_Center_of_Gravi                                 |
|      | ty(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|      | ;                                                             |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:long_name = \"Z angular       |
|      | position of the center of gravity\" ;                         |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:units = \"degrees\" ;         |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:scale_factor = 1.0d ;         |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:add_offset = 0.0d ;           |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:parameter_type = \"AVHRR      |
|      | data\" ;                                                      |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:valid_range = 0.0f, 360.0f ;  |
|      |                                                               |
|      | AVHRR_Z_Angle_Center_of_Gravity:\_FillValue = -9999.0f ;      |
|      |                                                               |
|      | float                                                         |
|      | AVHRR_Mean_Radiances(Number_of_Dice,Number_                   |
|      | of_Dots,Number_of_AVHRR_FOV_Classes,Number_of_AVHRR_Channels) |
|      | ;                                                             |
|      |                                                               |
|      | AVHRR_Mean_Radiances:long_name = \"Mean AVHRR radiances for   |
|      | each FOV\" ;                                                  |
|      |                                                               |
|      | AVHRR_Mean_Radiances:units = \"mW/m2/cm-1/sr\" ;              |
|      |                                                               |
|      | AVHRR_Mean_Radiances:scale_factor = 1.0d ;                    |
|      |                                                               |
|      | AVHRR_Mean_Radiances:add_offset = 0.0d ;                      |
|      |                                                               |
|      | AVHRR_Mean_Radiances:parameter_type = \"AVHRR data\" ;        |
|      |                                                               |
|      | AVHRR_Mean_Radiances:valid_range = 0.0f, 40000.0f ;           |
|      |                                                               |
|      | AVHRR_Mean_Radiances:\_FillValue = -9999.0f ;                 |
|      |                                                               |
|      | float                                                         |
|      | AVHRR_Std_Radiances(Number_of_Dice,Number_                    |
|      | of_Dots,Number_of_AVHRR_FOV_Classes,Number_of_AVHRR_Channels) |
|      | ;                                                             |
|      |                                                               |
|      | AVHRR_Std_Radiances:long_name = \"Standard deviation of       |
|      | radiances for each FOV\" ;                                    |
|      |                                                               |
|      | AVHRR_Std_Radiances:units = \"mW/m2/cm-1/sr\" ;               |
|      |                                                               |
|      | AVHRR_Std_Radiances:scale_factor = 1.0d ;                     |
|      |                                                               |
|      | AVHRR_Std_Radiances:add_offset = 0.0d ;                       |
|      |                                                               |
|      | AVHRR_Std_Radiances:parameter_type = \"AVHRR data\" ;         |
|      |                                                               |
|      | AVHRR_Std_Radiances:valid_range = 0.0f, 40000.0f ;            |
|      |                                                               |
|      | AVHRR_Std_Radiances:\_FillValue = -9999.0f ;                  |
|      |                                                               |
|      | float View_Angle(Number_of_Dice,Number_of_Dots) ;             |
|      |                                                               |
|      | View_Angle:long_name = \"IASI View Angles for each FOV\" ;    |
|      |                                                               |
|      | View_Angle:units = \"degrees\" ;                              |
|      |                                                               |
|      | View_Angle:scale_factor = 1.0d ;                              |
|      |                                                               |
|      | View_Angle:add_offset = 0.0d ;                                |
|      |                                                               |
|      | View_Angle:parameter_type = \"IASI data\" ;                   |
|      |                                                               |
|      | View_Angle:valid_range = -90.0f, 90.0f ;                      |
|      |                                                               |
|      | View_Angle:\_FillValue = -9999.0f ;                           |
|      |                                                               |
|      | float Satellite_Height(Number_of_Dice,Number_of_Dots) ;       |
|      |                                                               |
|      | Satellite_Height:long_name = \"Satellite height above each    |
|      | FOV\" ;                                                       |
|      |                                                               |
|      | Satellite_Height:units = \"km\" ;                             |
|      |                                                               |
|      | Satellite_Height:scale_factor = 1.0 ;                         |
|      |                                                               |
|      | Satellite_Height:add_offset = 0.0 ;                           |
|      |                                                               |
|      | Satellite_Height:parameter_type = \"IASI data\" ;             |
|      |                                                               |
|      | Satellite_Height:valid_range = 0.0f, 1000.0f ;                |
|      |                                                               |
|      | Satellite_Height:\_FillValue = -9999.0f ;                     |
|      |                                                               |
|      | float Satellite_Zenith(Number_of_Dice,Number_of_Dots) ;       |
|      |                                                               |
|      | Satellite_Zenith:long_name = \"Satellite zenith angles for    |
|      | each FOV\" ;                                                  |
|      |                                                               |
|      | Satellite_Zenith:units = \"degrees\" ;                        |
|      |                                                               |
|      | Satellite_Zenith:scale_factor = 1.0 ;                         |
|      |                                                               |
|      | Satellite_Zenith:add_offset = 0.0 ;                           |
|      |                                                               |
|      | Satellite_Zenith:parameter_type = \"IASI data\" ;             |
|      |                                                               |
|      | Satellite_Zenith:valid_range = 0.0f, 90.0f ;                  |
|      |                                                               |
|      | Satellite_Zenith:\_FillValue = -9999.0f ;                     |
|      |                                                               |
|      | float Satellite_Azimuth(Number_of_Dice,Number_of_Dots) ;      |
|      |                                                               |
|      | Satellite_Azimuth:long_name = \"Satellite azimuth angles for  |
|      | each FOV\" ;                                                  |
|      |                                                               |
|      | Satellite_Azimuth:units = \"degrees\" ;                       |
|      |                                                               |
|      | Satellite_Azimuth:scale_factor = 1.0 ;                        |
|      |                                                               |
|      | Satellite_Azimuth:add_offset = 0.0 ;                          |
|      |                                                               |
|      | Satellite_Azimuth:parameter_type = \"IASI data\" ;            |
|      |                                                               |
|      | Satellite_Azimuth:valid_range = 0.0f, 180.0f ;                |
|      |                                                               |
|      | Satellite_Azimuth:\_FillValue = -9999.0f ;                    |
|      |                                                               |
|      | float Solar_Zenith(Number_of_Dice, Number_of_Dots) ;          |
|      |                                                               |
|      | Solar_Zenith:long_name = \"Solar zenith angles for each FOV\" |
|      | ;                                                             |
|      |                                                               |
|      | Solar_Zenith:units = \"degrees\" ;                            |
|      |                                                               |
|      | Solar_Zenith:scale_factor = 1.0 ;                             |
|      |                                                               |
|      | Solar_Zenith:add_offset = 0.0 ;                               |
|      |                                                               |
|      | Solar_Zenith:parameter_type = \"IASI data\" ;                 |
|      |                                                               |
|      | Solar_Zenith:valid_range = 0.f, 90.f ;                        |
|      |                                                               |
|      | Solar_Zenith:\_FillValue = -9999.f ;                          |
|      |                                                               |
|      | float Solar_Azimuth(Number_of_Dice, Number_of_Dots) ;         |
|      |                                                               |
|      | Solar_Azimuth:long_name = \"Solar azimuth angles for each     |
|      | FOV\" ;                                                       |
|      |                                                               |
|      | Solar_Azimuth:units = \"degrees\" ;                           |
|      |                                                               |
|      | Solar_Azimuth:scale_factor = 1.0 ;                            |
|      |                                                               |
|      | Solar_Azimuth:add_offset = 0.0 ;                              |
|      |                                                               |
|      | Solar_Azimuth:parameter_type = \"IASI data\" ;                |
|      |                                                               |
|      | Solar_Azimuth:valid_range = 0.f, 180.f ;                      |
|      |                                                               |
|      | Solar_Azimuth:\_FillValue = -9999.f ;                         |
|      |                                                               |
|      | short Ascending_Descending(Number_of_Dice, Number_of_Dots) ;  |
|      |                                                               |
|      | Ascending_Descending:long_name = \"0=Descending,              |
|      | 1=Ascending\" ;                                               |
|      |                                                               |
|      | Ascending_Descending:units = \"none\" ;                       |
|      |                                                               |
|      | Ascending_Descending:scale_factor = 1 ;                       |
|      |                                                               |
|      | Ascending_Descending:add_offset = 0 ;                         |
|      |                                                               |
|      | Ascending_Descending:parameter_type = \"IASI data\" ;         |
|      |                                                               |
|      | Ascending_Descending:valid_range = 0, 1 ;                     |
|      |                                                               |
|      | Ascending_Descending:\_FillValue = -9999s ;                   |
|      |                                                               |
|      | long Orbit_Number(Number_of_Dice,Number_of_Dots) ;            |
|      |                                                               |
|      | Orbit_Number:long_name = \"The number of the current orbit\"  |
|      | ;                                                             |
|      |                                                               |
|      | Orbit_Number:units = \"none\" ;                               |
|      |                                                               |
|      | Orbit_Number:scale_factor = 1.0d ;                            |
|      |                                                               |
|      | Orbit_Number:add_offset = 0.0d ;                              |
|      |                                                               |
|      | Orbit_Number:parameter_type = \"IASI data\" ;                 |
|      |                                                               |
|      | Orbit_Number:valid_range = 1.0f, 100000.0f ;                  |
|      |                                                               |
|      | Orbit_Number:\_FillValue = -9999 ;                            |
+------+---------------------------------------------------------------+

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

These files reside in the level2 products directory for the given
granule:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

These files are sent to the DDS where they are retrieved by CLASS. The
details of the archiving of the L2 and CCR products are described in a
data submission agreement separate from the level 1C products called The
Producer Archive Submission Agreement for IASI L2 Products
(NESDIS/CLASS, 2008).

Files are sent to the DDS by the scripts that generate them:
*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## *IASI L2 and CCR Metadata*

Granule metadata files generated for each of the IASI Level 2 and CCR
NetCDF product files.

### Purpose

The metadata files are pushed to the DDS by the STAR near real time
processing system. This system runs in OSDPD operations. CLASS will
access the DDS in accordance with Producer-Archive Submission Agreement
for IASI Level 2 Products.

### Data File Discription

These are Federal Geographic Data Committee Remote Sensing Extension
(FGDC-RSE) compliant xml format files. There is one granule metadata
file associated with each NetCDF product file. These metadata files are
derived from the L2 and CCR metadata template files
(*IASI_L2_Granule_Metadata_Template.xml* and
*IASI_CCR_Granule_Metadata_Template.xml*) by the Perl script called
*Create_IASI_L2_Metadata.pl* which runs within the L2 Processing unit.

These metadata files have the same name structure as their associated
product files except with an *.xml* extension.

IASI_L2_M02_V\${YYMMDD}\_\${YYYYMODDHHMMSS}Z\_\${YYYYMODDHHMMSS}Z.nc.xml

IASI_CCR_M02_V\${YYMMDD}\_\${YYYYMODDHHMMSS}Z\_\${YYYYMODDHHMMSS}Z.nc.xml

### Intended Users

CLASS

POC: John Bates

Chief, Remote Sensing and Applications Division

NOAA / NESDIS / National Climatic Data Center (NCDC) / Remote Sensing
and Applications Division (RSAD)

Asheville, NC

Phone: (828) 271-4378

Fax: (828) 271-4328

Address: 151 Patton Avenue, Room 516 D Ashville, NC 28801

### Access

These files reside with their associate data files in the level2
products directory for the given granule:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

These files are sent to the DDS where they are retrieved by CLASS. The
details of the archiving of the L2 and CCR products are described in a
data submission agreement separate from the level 1C products called The
Producer Archive Submission Agreement for IASI L2 Products
(NESDIS/CLASS, 2008).

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: cathy.nichols@noaa.gov

## IASI CCR BUFR Files

### Purpose

The BUFR files are cloud-cleared radiance files generated for use by NWP
centers. These data are then used for assimilation in numerical models.

### Data File Description

Their structure is based on the content of the BUFR table. Nominally
there are 480 of these files per day. They are generated from the NetCDF
subset files by the program *main_iasi_netcdf_to_bufr* which resides in
L2 Processing unit. Therefore BUFR files are created in the following
directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

The BUFR files are distributed from these directories to the DDS where
they are retrieved by customers. The output BUFR file names have the
following name structure.

NPR\_\${PROD}.M02_D\${Year}\${Doy}\_S\${Hour}\${Minute}\${Second}\_E\${Hour}\${Minute}\${Second}\_G\${Granule_Number}\_C\${Channel_Set}\_U\${Subset}

Where:

NPR = Near real-time processing\
*\$PROD* = Product type ID (IARD = ( IASI cloud-cleared radiances)\
M02 = MetOp2 abbreviation\
D = date string indicator\
S = starting time indicator\
E = ending time indicator

*\${Year}* = the 2-digit year

*\${Doy}* = 3-digit day of year

*\${Hour}* = 2-digit hour

*\${Minute}* = 2-digit minute

*\${Second}* = 2-digit second

G = granule number indicator

*\${Granule_Number}* = 3-digit granule number (1-480)\
C = channel set indicator

*\${Channel_Set}* = the number of channels in the subset (e.g. 616 or
8461)\
U = the subset type indicator

*\${Subset}* = subset type (e.g. U3, U5, or U6)

BUFR table, needed to read IASI BUFR granule files, is presented in
Appendix A.

### Intended Users

NWP centers.

### Access

The files are created in the following directory:

*\$BASE/SATELLITE_DATA/MetOpA/NRT_DATA/\${Year}/\${Month}/\${Day}/IASI_DATA/Granule-\${Granule_Number}/level2*

where:

*\${Year}* = the 4-digit year

*\${Month}* = 2-digit month

*\${Day}* = 2-digit day of month

*\${Granule_Number}* = 3-digit granule number (1-480)

The BUFR files are distributed from these level 1c directories to the
DDS where they are retrieved by customers:

*dds.nesdis.noaa.gov:push*

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

## *IASI NetCDF Principal Component File*

Principal components are selected from only the warmest fields of view
from each IASI field of regard.

### Purpose

These files are for NRL/FNMOC's principal component data
assimilation**.**

### Data File Description

The files are about 2 MB in size each. Their name structure is

IASI_M02_PCS\_\${YYYYMODDHHMMSS}Z\_\${YYYYMODDHHMMSS}Z.nc

where:

IASI = Instrument name

PCS = Principal Components

M02 = Satellite ID (M02 = Metop-A)

YYYYMODDHHMMSSZ = The sensing date/time of observations. The first
string indicates the starting date/time and the second string indicates
the ending date/time.

nc = File type extension indicates NetCDF format

The string "YYYYMODDHHMMSSZ" is a date string containing the following
components of time:

YYYY = 4 digit year (e.g. 2005)

MO = 2 digit month (01-12)

DD = day of month (01-31)

HH = hour (00-23)

MM = minute (00-59)

SS = seconds (00-59)

Z = Greenwich Mean Time (GMT)

###   {#section-11 .unnumbered}

Table 40. IASI NetCDF Principal Component File Header

+---+------------------------------------------------------------------+
| d | Number_of_Dice = 660 ; // Number dice written                    |
| i |                                                                  |
| m | Number_of_Dots = 1 ; // Number of IASI FOVS in a die             |
| e |                                                                  |
| n | Number_of_IASI_Channels = 8461 ; // Number of IASI channels in   |
| s | eigenvector set                                                  |
| i |                                                                  |
| o | Number_of_IASI_Frequencies = 8461 ; // Number of IASI channels   |
| n | in eigenvector set                                               |
| s |                                                                  |
| : | Number_of_Principal_Components = 600 ;                           |
|   |                                                                  |
| v | Number_of_PC_Scores = 3 ;                                        |
| a |                                                                  |
| r | Number_of_AVHRR_Channels = 6; // Number of AVHRR channels        |
| i |                                                                  |
| a | Number_of_AVHRR_FOV_Classes = 7; // Number of AVHRR sounder FOV  |
| b | classes                                                          |
| l |                                                                  |
| e | Number_of_AVHRR_Frequencies = 6;                                 |
| s |                                                                  |
| : | long IASI_Channels(Number_of_IASI_Channels) ;                    |
|   |                                                                  |
|   | IASI_Channels:long_name = \"Channel number for data\" ;          |
|   |                                                                  |
|   | IASI_Channels:units = \"none\" ;                                 |
|   |                                                                  |
|   | IASI_Channels:scale_factor = 1.0d ;                              |
|   |                                                                  |
|   | IASI_Channels:add_offset = 0.0d ;                                |
|   |                                                                  |
|   | IASI_Channels:parameter_type = \"IASI data\" ;                   |
|   |                                                                  |
|   | IASI_Channels:valid_range = 1.0f, 8461.0f ;                      |
|   |                                                                  |
|   | IASI_Channels:\_FillValue = -9999 ;                              |
|   |                                                                  |
|   | float IASI_Frequencies(Number_of_IASI_Frequencies) ;             |
|   |                                                                  |
|   | IASI_Frequencies:long_name = \"Frequency at which the data is    |
|   | taken\" ;                                                        |
|   |                                                                  |
|   | IASI_Frequencies:units = \"wavenumber cm-1\" ;                   |
|   |                                                                  |
|   | IASI_Frequencies:scale_factor = 1.0d ;                           |
|   |                                                                  |
|   | IASI_Frequencies:add_offset = 0.0d ;                             |
|   |                                                                  |
|   | IASI_Frequencies:parameter_type = \"IASI data\" ;                |
|   |                                                                  |
|   | IASI_Frequencies:valid_range = 0.0f, 10000.0f ;                  |
|   |                                                                  |
|   | IASI_Frequencies:\_FillValue = -9999.0f ;                        |
|   |                                                                  |
|   | long AVHRR_Channels(Number_of_AVHRR_Channels) ;                  |
|   |                                                                  |
|   | AVHRR_Channels:long_name = \"Channel number for data\" ;         |
|   |                                                                  |
|   | AVHRR_Channels:units = \"none\" ;                                |
|   |                                                                  |
|   | AVHRR_Channels:scale_factor = 1.0d ;                             |
|   |                                                                  |
|   | AVHRR_Channels:add_offset = 0.0d ;                               |
|   |                                                                  |
|   | AVHRR_Channels:parameter_type = \"AVHRR data\" ;                 |
|   |                                                                  |
|   | AVHRR_Channels:valid_range = 1.0f, 6.0f ;                        |
|   |                                                                  |
|   | AVHRR_Channels:\_FillValue = -9999 ;                             |
|   |                                                                  |
|   | float AVHRR_Frequencies(Number_of_AVHRR_Frequencies) ;           |
|   |                                                                  |
|   | AVHRR_Frequencies:long_name = \"Frequency at which the data is   |
|   | taken\" ;                                                        |
|   |                                                                  |
|   | AVHRR_Frequencies:units = \"wavenumber cm-1\" ;                  |
|   |                                                                  |
|   | AVHRR_Frequencies:scale_factor = 1.0d ;                          |
|   |                                                                  |
|   | AVHRR_Frequencies:add_offset = 0.0d ;                            |
|   |                                                                  |
|   | AVHRR_Frequencies:parameter_type = \"AVHRR data\" ;              |
|   |                                                                  |
|   | AVHRR_Frequencies:valid_range = 0.0f, 16000.0f ;                 |
|   |                                                                  |
|   | AVHRR_Frequencies:\_FillValue = -9999.0f ;                       |
|   |                                                                  |
|   | long AVHRR_FOV_Classes(Number_of_AVHRR_FOV_Classes) ;            |
|   |                                                                  |
|   | AVHRR_FOV_Classes:long_name = \"The index of the AVHRR FOV       |
|   | sounder class\" ;                                                |
|   |                                                                  |
|   | AVHRR_FOV_Classes:units = \"none\" ;                             |
|   |                                                                  |
|   | AVHRR_FOV_Classes:scale_factor = 1.0d ;                          |
|   |                                                                  |
|   | AVHRR_FOV_Classes:add_offset = 0.0d ;                            |
|   |                                                                  |
|   | AVHRR_FOV_Classes:parameter_type = \"AVHRR data\" ;              |
|   |                                                                  |
|   | AVHRR_FOV_Classes:valid_range = 1.0f, 7.0f ;                     |
|   |                                                                  |
|   | AVHRR_FOV_Classes:\_FillValue = -9999 ;                          |
|   |                                                                  |
|   | long Dice(Number_of_Dice) ;                                      |
|   |                                                                  |
|   | Dice:long_name = \"The index of the IASI fields of regard\" ;    |
|   |                                                                  |
|   | Dice:units = \"none\" ;                                          |
|   |                                                                  |
|   | Dice:scale_factor = 1.0d ;                                       |
|   |                                                                  |
|   | Dice:add_offset = 0.0d ;                                         |
|   |                                                                  |
|   | Dice:parameter_type = \"IASI data\" ;                            |
|   |                                                                  |
|   | Dice:valid_range = 1.0f, 660.0f ;                                |
|   |                                                                  |
|   | Dice:\_FillValue = -9999 ;                                       |
|   |                                                                  |
|   | long Dots(Number_of_Dots) ;                                      |
|   |                                                                  |
|   | Dots:long_name = \"The index of the IASI fields of view\" ;      |
|   |                                                                  |
|   | Dots:units = \"none\" ;                                          |
|   |                                                                  |
|   | Dots:scale_factor = 1.0d ;                                       |
|   |                                                                  |
|   | Dots:add_offset = 0.0d ;                                         |
|   |                                                                  |
|   | Dots:parameter_type = \"IASI data\" ;                            |
|   |                                                                  |
|   | Dots:valid_range = 1.0f, 4.0f ;                                  |
|   |                                                                  |
|   | Dots:\_FillValue = -9999 ;                                       |
|   |                                                                  |
|   | long Scan_Line(Number_of_Dice,Number_of_Dots) ;                  |
|   |                                                                  |
|   | Scan_Line:long_name = \"The number of the current scan line\" ;  |
|   |                                                                  |
|   | Scan_Line:units = \"none\" ;                                     |
|   |                                                                  |
|   | Scan_Line:scale_factor = 1.0d ;                                  |
|   |                                                                  |
|   | Scan_Line:add_offset = 0.0d ;                                    |
|   |                                                                  |
|   | Scan_Line:parameter_type = \"IASI data\" ;                       |
|   |                                                                  |
|   | Scan_Line:valid_range = 1.0f, 22.0f ;                            |
|   |                                                                  |
|   | Scan_Line:\_FillValue = -9999 ;                                  |
|   |                                                                  |
|   | long AMSU_FOV(Number_of_Dice,Number_of_Dots) ;                   |
|   |                                                                  |
|   | AMSU_FOV:long_name = \"The number of the current AMSU FOV\" ;    |
|   |                                                                  |
|   | AMSU_FOV:units = \"none\" ;                                      |
|   |                                                                  |
|   | AMSU_FOV:scale_factor = 1.0d ;                                   |
|   |                                                                  |
|   | AMSU_FOV:add_offset = 0.0d ;                                     |
|   |                                                                  |
|   | AMSU_FOV:parameter_type = \"IASI data\" ;                        |
|   |                                                                  |
|   | AMSU_FOV:valid_range = 1.0f, 30.0f ;                             |
|   |                                                                  |
|   | AMSU_FOV:\_FillValue = -9999 ;                                   |
|   |                                                                  |
|   | long IASI_FOV(Number_of_Dice,Number_of_Dots) ;                   |
|   |                                                                  |
|   | IASI_FOV:long_name = \"The number of the current IASI FOV\" ;    |
|   |                                                                  |
|   | IASI_FOV:units = \"none\" ;                                      |
|   |                                                                  |
|   | IASI_FOV:scale_factor = 1.0d ;                                   |
|   |                                                                  |
|   | IASI_FOV:add_offset = 0.0d ;                                     |
|   |                                                                  |
|   | IASI_FOV:parameter_type = \"IASI data\" ;                        |
|   |                                                                  |
|   | IASI_FOV:valid_range = 1.0f, 4.0f ;                              |
|   |                                                                  |
|   | IASI_FOV:\_FillValue = -9999 ;                                   |
|   |                                                                  |
|   | short GQisFlagQual(Number_of_Dice,Number_of_Dots) ;              |
|   |                                                                  |
|   | GQisFlagQual:long_name = \"System QC flag\" ;                    |
|   |                                                                  |
|   | GQisFlagQual:units = \"none\" ;                                  |
|   |                                                                  |
|   | GQisFlagQual:scale_factor = 1 ;                                  |
|   |                                                                  |
|   | GQisFlagQual:add_offset = 0 ;                                    |
|   |                                                                  |
|   | GQisFlagQual:parameter_type = \"IASI data\" ;                    |
|   |                                                                  |
|   | GQisFlagQual:valid_range = 0, 1 ;                                |
|   |                                                                  |
|   | GQisFlagQual:\_FillValue = -9999s ;                              |
|   |                                                                  |
|   | float GQisQualIndex(Number_of_Dice,Number_of_Dots) ;             |
|   |                                                                  |
|   | GQisQualIndex:long_name = \"System QC flag\" ;                   |
|   |                                                                  |
|   | GQisQualIndex:units = \"none\" ;                                 |
|   |                                                                  |
|   | GQisQualIndex:scale_factor = 1.0d ;                              |
|   |                                                                  |
|   | GQisQualIndex:add_offset = 0.0d ;                                |
|   |                                                                  |
|   | GQisQualIndex:parameter_type = \"IASI data\" ;                   |
|   |                                                                  |
|   | GQisQualIndex:valid_range = 0.0f, 9999.0f ;                      |
|   |                                                                  |
|   | GQisQualIndex:\_FillValue = -9999.0f ;                           |
|   |                                                                  |
|   | float GQisQualIndexLoc(Number_of_Dice,Number_of_Dots) ;          |
|   |                                                                  |
|   | GQisQualIndexLoc:long_name = \"System QC flag\" ;                |
|   |                                                                  |
|   | GQisQualIndexLoc:units = \"none\" ;                              |
|   |                                                                  |
|   | GQisQualIndexLoc:scale_factor = 1.0d ;                           |
|   |                                                                  |
|   | GQisQualIndexLoc:add_offset = 0.0d ;                             |
|   |                                                                  |
|   | GQisQualIndexLoc:parameter_type = \"IASI data\" ;                |
|   |                                                                  |
|   | GQisQualIndexLoc:valid_range = 0.0f, 9999.0f ;                   |
|   |                                                                  |
|   | GQisQualIndexLoc:\_FillValue = -9999.0f ;                        |
|   |                                                                  |
|   | float GQisQualIndexRad(Number_of_Dice,Number_of_Dots) ;          |
|   |                                                                  |
|   | GQisQualIndexRad:long_name = \"System QC flag\" ;                |
|   |                                                                  |
|   | GQisQualIndexRad:units = \"none\" ;                              |
|   |                                                                  |
|   | GQisQualIndexRad:scale_factor = 1.0d ;                           |
|   |                                                                  |
|   | GQisQualIndexRad:add_offset = 0.0d ;                             |
|   |                                                                  |
|   | GQisQualIndexRad:parameter_type = \"IASI data\" ;                |
|   |                                                                  |
|   | GQisQualIndexRad:valid_range = 0.0f, 9999.0f ;                   |
|   |                                                                  |
|   | GQisQualIndexRad:\_FillValue = -9999.0f ;                        |
|   |                                                                  |
|   | float GQisQualIndexSpect(Number_of_Dice,Number_of_Dots) ;        |
|   |                                                                  |
|   | GQisQualIndexSpect:long_name = \"System QC flag\" ;              |
|   |                                                                  |
|   | GQisQualIndexSpect:units = \"none\" ;                            |
|   |                                                                  |
|   | GQisQualIndexSpect:scale_factor = 1.0d ;                         |
|   |                                                                  |
|   | GQisQualIndexSpect:add_offset = 0.0d ;                           |
|   |                                                                  |
|   | GQisQualIndexSpect:parameter_type = \"IASI data\" ;              |
|   |                                                                  |
|   | GQisQualIndexSpect:valid_range = 0.0f, 9999.0f ;                 |
|   |                                                                  |
|   | GQisQualIndexSpect:\_FillValue = -9999.0f ;                      |
|   |                                                                  |
|   | float GQisSysTecSondQual(Number_of_Dice,Number_of_Dots) ;        |
|   |                                                                  |
|   | GQisSysTecSondQual:long_name = \"System QC flag\" ;              |
|   |                                                                  |
|   | GQisSysTecSondQual:units = \"none\" ;                            |
|   |                                                                  |
|   | GQisSysTecSondQual:scale_factor = 1.0d ;                         |
|   |                                                                  |
|   | GQisSysTecSondQual:add_offset = 0.0d ;                           |
|   |                                                                  |
|   | GQisSysTecSondQual:parameter_type = \"IASI data\" ;              |
|   |                                                                  |
|   | GQisSysTecSondQual:valid_range = 0.0f, 9999.0f ;                 |
|   |                                                                  |
|   | GQisSysTecSondQual:\_FillValue = -9999.0f ;                      |
|   |                                                                  |
|   | double Time(Number_of_Dice,Number_of_Dots) ;                     |
|   |                                                                  |
|   | Time:long_name = \"UTC Milliseconds since Jan 1, 1970\" ;        |
|   |                                                                  |
|   | Time:units = \"msec\" ;                                          |
|   |                                                                  |
|   | Time:scale_factor = 1.0d ;                                       |
|   |                                                                  |
|   | Time:add_offset = 0.0d ;                                         |
|   |                                                                  |
|   | Time:parameter_type = \"IASI data\" ;                            |
|   |                                                                  |
|   | Time:valid_range = 0.0f, 1577836800000.0f ;                      |
|   |                                                                  |
|   | Time:\_FillValue = -9999.0 ;                                     |
|   |                                                                  |
|   | float Latitude(Number_of_Dice,Number_of_Dots) ;                  |
|   |                                                                  |
|   | Latitude:long_name = \"IASI Latitude values for each FOV\" ;     |
|   |                                                                  |
|   | Latitude:units = \"degrees North\" ;                             |
|   |                                                                  |
|   | Latitude:scale_factor = 1.0d ;                                   |
|   |                                                                  |
|   | Latitude:add_offset = 0.0d ;                                     |
|   |                                                                  |
|   | Latitude:parameter_type = \"IASI data\" ;                        |
|   |                                                                  |
|   | Latitude:valid_range = 90.0f, -90.0f ;                           |
|   |                                                                  |
|   | Latitude:\_FillValue = -9999.0f ;                                |
|   |                                                                  |
|   | float Longitude(Number_of_Dice,Number_of_Dots) ;                 |
|   |                                                                  |
|   | Longitude:long_name = \"IASI Longitude values for each FOV\" ;   |
|   |                                                                  |
|   | Longitude:units = \"degrees East\" ;                             |
|   |                                                                  |
|   | Longitude:scale_factor = 1.0d ;                                  |
|   |                                                                  |
|   | Longitude:add_offset = 0.0d ;                                    |
|   |                                                                  |
|   | Longitude:parameter_type = \"IASI data\" ;                       |
|   |                                                                  |
|   | Longitude:valid_range = -180.0f, 179.99f ;                       |
|   |                                                                  |
|   | Longitude:\_FillValue = -9999.0f ;                               |
|   |                                                                  |
|   | float Principal_Components(Number_of_Dice,Number_of_Dots,        |
|   |                                                                  |
|   | Number_of_Principal_Components) ;                                |
|   |                                                                  |
|   | Principal_Components:long_name = \"IASI principal components for |
|   | each FOV\";                                                      |
|   |                                                                  |
|   | Principal_Components:units = \"mW/m2/cm-1/sr\" ;                 |
|   |                                                                  |
|   | Principal_Components:scale_factor = 1.0d ;                       |
|   |                                                                  |
|   | Principal_Components:add_offset = 0.0d ;                         |
|   |                                                                  |
|   | Principal_Components:parameter_type = \"IASI data\" ;            |
|   |                                                                  |
|   | Principal_Components:valid_range = 0.0f, 40000.0f ;              |
|   |                                                                  |
|   | Principal_Components:\_FillValue = -9999.0f ;                    |
|   |                                                                  |
|   | float                                                            |
|   | PC_Scores(Number_of_Dice,Number_of_Dots,Number_of_PC_Scores) ;   |
|   |                                                                  |
|   | PC_Scores:long_name = \"IASI PC scores for each FOV\" ;          |
|   |                                                                  |
|   | PC_Scores:units = \"mW/m2/cm-1/sr\" ;                            |
|   |                                                                  |
|   | PC_Scores:scale_factor = 1.0d ;                                  |
|   |                                                                  |
|   | PC_Scores:add_offset = 0.0d ;                                    |
|   |                                                                  |
|   | PC_Scores:parameter_type = \"IASI data\" ;                       |
|   |                                                                  |
|   | PC_Scores:valid_range = 0.0f, 40000.0f ;                         |
|   |                                                                  |
|   | PC_Scores:\_FillValue = -9999.0f ;                               |
|   |                                                                  |
|   | short AVHRR_Channel_Combo(Number_of_Dice,Number_of_Dots) ;       |
|   |                                                                  |
|   | AVHRR_Channel_Combo:long_name = \"AVHRR Channels used in         |
|   | radiance analysis\" ;                                            |
|   |                                                                  |
|   | AVHRR_Channel_Combo:units = \"none\" ;                           |
|   |                                                                  |
|   | AVHRR_Channel_Combo:scale_factor = 1 ;                           |
|   |                                                                  |
|   | AVHRR_Channel_Combo:add_offset = 0 ;                             |
|   |                                                                  |
|   | AVHRR_Channel_Combo:parameter_type = \"IASI data\" ;             |
|   |                                                                  |
|   | AVHRR_Channel_Combo:valid_range = 0, 1 ;                         |
|   |                                                                  |
|   | AVHRR_Channel_Combo:\_FillValue = -9999s ;                       |
|   |                                                                  |
|   | float                                                            |
|   | Fraction_of_Clear_                                               |
|   | AVHRR(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|   | ;                                                                |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:long_name = \"Percent clear for each     |
|   | AVHRR FOV class\" ;                                              |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:units = \"%\" ;                          |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:scale_factor = 1.0d ;                    |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:add_offset = 0.0d ;                      |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:parameter_type = \"AVHRR data\" ;        |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:valid_range = 0.0f, 100.0f ;             |
|   |                                                                  |
|   | Fraction_of_Clear_AVHRR:\_FillValue = -9999.0f ;                 |
|   |                                                                  |
|   | float                                                            |
|   | AVHRR_Y_Angle_Center_of_Gr                                       |
|   | avity(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|   | ;                                                                |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:long_name = \"Y angular position |
|   | of the center of gravity\" ;                                     |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:units = \"degrees\" ;            |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:scale_factor = 1.0d ;            |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:add_offset = 0.0d ;              |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:parameter_type = \"AVHRR data\"  |
|   | ;                                                                |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:valid_range = 0.0f, 360.0f ;     |
|   |                                                                  |
|   | AVHRR_Y_Angle_Center_of_Gravity:\_FillValue = -9999.0f ;         |
|   |                                                                  |
|   | float                                                            |
|   | AVHRR_Z_Angle_Center_of_Gr                                       |
|   | avity(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes) |
|   | ;                                                                |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:long_name = \"Z angular position |
|   | of the center of gravity\" ;                                     |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:units = \"degrees\" ;            |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:scale_factor = 1.0d ;            |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:add_offset = 0.0d ;              |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:parameter_type = \"AVHRR data\"  |
|   | ;                                                                |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:valid_range = 0.0f, 360.0f ;     |
|   |                                                                  |
|   | AVHRR_Z_Angle_Center_of_Gravity:\_FillValue = -9999.0f ;         |
|   |                                                                  |
|   | float AVHRR_Mean_Radiances(Number_of_Dice,Number_of_Dots,        |
|   |                                                                  |
|   | Number_of_AVHRR_FOV_Classes,Number_of_AVHRR_Channels) ;          |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:long_name = \"Mean AVHRR radiances for each |
|   | FOV\" ;                                                          |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:units = \"mW/m2/cm-1/sr\" ;                 |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:scale_factor = 1.0d ;                       |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:add_offset = 0.0d ;                         |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:parameter_type = \"AVHRR data\" ;           |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:valid_range = 0.0f, 40000.0f ;              |
|   |                                                                  |
|   | AVHRR_Mean_Radiances:\_FillValue = -9999.0f ;                    |
|   |                                                                  |
|   | float                                                            |
|   | AVHRR_Std_Radi                                                   |
|   | ances(Number_of_Dice,Number_of_Dots,Number_of_AVHRR_FOV_Classes, |
|   |                                                                  |
|   | Number_of_AVHRR_Channels) ;                                      |
|   |                                                                  |
|   | AVHRR_Std_Radiances:long_name = \"Standard deviation of          |
|   | radiances for each FOV\" ;                                       |
|   |                                                                  |
|   | AVHRR_Std_Radiances:units = \"mW/m2/cm-1/sr\" ;                  |
|   |                                                                  |
|   | AVHRR_Std_Radiances:scale_factor = 1.0d ;                        |
|   |                                                                  |
|   | AVHRR_Std_Radiances:add_offset = 0.0d ;                          |
|   |                                                                  |
|   | AVHRR_Std_Radiances:parameter_type = \"AVHRR data\" ;            |
|   |                                                                  |
|   | AVHRR_Std_Radiances:valid_range = 0.0f, 40000.0f ;               |
|   |                                                                  |
|   | AVHRR_Std_Radiances:\_FillValue = -9999.0f ;                     |
|   |                                                                  |
|   | float View_Angle(Number_of_Dice,Number_of_Dots) ;                |
|   |                                                                  |
|   | View_Angle:long_name = \"IASI View Angles for each FOV\" ;       |
|   |                                                                  |
|   | View_Angle:units = \"degrees\" ;                                 |
|   |                                                                  |
|   | View_Angle:scale_factor = 1.0d ;                                 |
|   |                                                                  |
|   | View_Angle:add_offset = 0.0d ;                                   |
|   |                                                                  |
|   | View_Angle:parameter_type = \"IASI data\" ;                      |
|   |                                                                  |
|   | View_Angle:valid_range = -90.0f, 90.0f ;                         |
|   |                                                                  |
|   | View_Angle:\_FillValue = -9999.0f ;                              |
|   |                                                                  |
|   | float Satellite_Height(Number_of_Dice,Number_of_Dots) ;          |
|   |                                                                  |
|   | Satellite_Height:long_name = \"Satellite height above each FOV\" |
|   | ;                                                                |
|   |                                                                  |
|   | Satellite_Height:units = \"km\" ;                                |
|   |                                                                  |
|   | Satellite_Height:scale_factor = 1.0 ;                            |
|   |                                                                  |
|   | Satellite_Height:add_offset = 0.0 ;                              |
|   |                                                                  |
|   | Satellite_Height:parameter_type = \"IASI data\" ;                |
|   |                                                                  |
|   | Satellite_Height:valid_range = 0.0f, 1000.0f ;                   |
|   |                                                                  |
|   | Satellite_Height:\_FillValue = -9999.0f ;                        |
|   |                                                                  |
|   | float Satellite_Zenith(Number_of_Dice,Number_of_Dots) ;          |
|   |                                                                  |
|   | Satellite_Zenith:long_name = \"Satellite zenith angles for each  |
|   | FOV\" ;                                                          |
|   |                                                                  |
|   | Satellite_Zenith:units = \"degrees\" ;                           |
|   |                                                                  |
|   | Satellite_Zenith:scale_factor = 1.0 ;                            |
|   |                                                                  |
|   | Satellite_Zenith:add_offset = 0.0 ;                              |
|   |                                                                  |
|   | Satellite_Zenith:parameter_type = \"IASI data\" ;                |
|   |                                                                  |
|   | Satellite_Zenith:valid_range = 0.0f, 90.0f ;                     |
|   |                                                                  |
|   | Satellite_Zenith:\_FillValue = -9999.0f ;                        |
|   |                                                                  |
|   | float Satellite_Azimuth(Number_of_Dice,Number_of_Dots) ;         |
|   |                                                                  |
|   | Satellite_Azimuth:long_name = \"Satellite azimuth angles for     |
|   | each FOV\" ;                                                     |
|   |                                                                  |
|   | Satellite_Azimuth:units = \"degrees\" ;                          |
|   |                                                                  |
|   | Satellite_Azimuth:scale_factor = 1.0 ;                           |
|   |                                                                  |
|   | Satellite_Azimuth:add_offset = 0.0 ;                             |
|   |                                                                  |
|   | Satellite_Azimuth:parameter_type = \"IASI data\" ;               |
|   |                                                                  |
|   | Satellite_Azimuth:valid_range = 0.0f, 180.0f ;                   |
|   |                                                                  |
|   | Satellite_Azimuth:\_FillValue = -9999.0f ;                       |
|   |                                                                  |
|   | float Solar_Zenith(Number_of_Dice, Number_of_Dots) ;             |
|   |                                                                  |
|   | Solar_Zenith:long_name = \"Solar zenith angles for each FOV\" ;  |
|   |                                                                  |
|   | Solar_Zenith:units = \"degrees\" ;                               |
|   |                                                                  |
|   | Solar_Zenith:scale_factor = 1.0 ;                                |
|   |                                                                  |
|   | Solar_Zenith:add_offset = 0.0 ;                                  |
|   |                                                                  |
|   | Solar_Zenith:parameter_type = \"IASI data\" ;                    |
|   |                                                                  |
|   | Solar_Zenith:valid_range = 0.f, 90.f ;                           |
|   |                                                                  |
|   | Solar_Zenith:\_FillValue = -9999.f ;                             |
|   |                                                                  |
|   | float Solar_Azimuth(Number_of_Dice, Number_of_Dots) ;            |
|   |                                                                  |
|   | Solar_Azimuth:long_name = \"Solar azimuth angles for each FOV\"  |
|   | ;                                                                |
|   |                                                                  |
|   | Solar_Azimuth:units = \"degrees\" ;                              |
|   |                                                                  |
|   | Solar_Azimuth:scale_factor = 1.0 ;                               |
|   |                                                                  |
|   | Solar_Azimuth:add_offset = 0.0 ;                                 |
|   |                                                                  |
|   | Solar_Azimuth:parameter_type = \"IASI data\" ;                   |
|   |                                                                  |
|   | Solar_Azimuth:valid_range = 0.f, 180.f ;                         |
|   |                                                                  |
|   | Solar_Azimuth:\_FillValue = -9999.f ;                            |
|   |                                                                  |
|   | short Ascending_Descending(Number_of_Dice, Number_of_Dots) ;     |
|   |                                                                  |
|   | Ascending_Descending:long_name = \"0=Descending, 1=Ascending\" ; |
|   |                                                                  |
|   | Ascending_Descending:units = \"none\" ;                          |
|   |                                                                  |
|   | Ascending_Descending:scale_factor = 1 ;                          |
|   |                                                                  |
|   | Ascending_Descending:add_offset = 0 ;                            |
|   |                                                                  |
|   | Ascending_Descending:parameter_type = \"IASI data\" ;            |
|   |                                                                  |
|   | Ascending_Descending:valid_range = 0, 1 ;                        |
|   |                                                                  |
|   | Ascending_Descending:\_FillValue = -9999s ;                      |
|   |                                                                  |
|   | long Orbit_Number(Number_of_Dice,Number_of_Dots) ;               |
|   |                                                                  |
|   | Orbit_Number:long_name = \"The number of the current orbit\" ;   |
|   |                                                                  |
|   | Orbit_Number:units = \"none\" ;                                  |
|   |                                                                  |
|   | Orbit_Number:scale_factor = 1.0d ;                               |
|   |                                                                  |
|   | Orbit_Number:add_offset = 0.0d ;                                 |
|   |                                                                  |
|   | Orbit_Number:parameter_type = \"IASI data\" ;                    |
|   |                                                                  |
|   | Orbit_Number:valid_range = 1.0f, 100000.0f ;                     |
|   |                                                                  |
|   | Orbit_Number:\_FillValue = -9999 ;                               |
+---+------------------------------------------------------------------+

### Intended Users

NRL/FNMOC

### Access

These files are distributed from level 1c directories to the DDS.

POC -- Nichols, Catherine L

5200 Auth Road, Room 0315, Building: FB4

Suitland, MD 20746 -- 4301

Phone: (301)457-5245

Fax: (301)457-5199

E-mail: <cathy.nichols@noaa.gov>

# LIST OF REFERENCES

EUMETSAT (2004), IASI Level 1 Product Format Specifications, Ref:
EUM.EPS.SYS.SPE.990003, Issue 6, Rev 6, WEB number 270000.

EUMETSAT (2003), EPS Programme Generic Product Format Specification ,
Ref: EPS.GGS.SPE.96167, Issue 6, Rev 4, WEB number 270000.

FGDC (1998), Content Standard for Digital Geospatial Metadata, VERSION
2, FGDC-STD-001-1998.

FGDC (2002), Content Standard for Digital Geospatial Metadata:
Extensions for Remote Sending Metadata, FGDC-STD-012-2002.

NESDIS/CLASS (2006), Producer Archive Submission Agreement for IASI
Products. CLASS-1135-CLS-AGR-IASI. X080.

NESDIS/CLASS (2008), Producer Archive Submission Agreement for IASI L2
Products. In Progress.

NESDIS/STAR (2008a), IASI Product Processing System Project Baseline
Report.

NESDIS/STAR (2008b), IASI Product Processing System Requirements
Allocation Document.

NESDIS/STAR (2007c), STAR Unit Test Plan Document Guideline Version DG-
12.3, Version 2.

NESDIS/STAR (2008d), IASI Product Processing System Metadata Document.

NESDIS/STAR (2008e), IASI Product Processing System Interface Control
Document.

NESDIS/STAR (2008f), IASI Product Processing System System Maintenance
Manual.

NESDIS/STAR (2008g), IASI Product Processing System Products Operations
Manual.

NESDIS/STAR/IPD (2006), IASI Operations and Test Machine System
Requirements Document.

# Appendix A - IASI L1C BUFR Table  {#appendix-a---iasi-l1c-bufr-table .unnumbered}

\-\-\-\-\-\-\-\-\-\-\-- USER DEFINITIONS FOR TABLE-A TABLE-B TABLE D
\-\-\-\-\-\-\-\-\-\-\-\-\-- \|

\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MNEMONIC \| NUMBER \| DESCRIPTION \|

\|\-\-\-\-\-\-\-\-\--\|\-\-\-\-\-\-\--\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|

\| \| \| \|

\| NC021241 \| A61207 \| IASI 1C radiance data variable channels subset
\|

\| \| \| \|

\| IASIL1CB \| 340002 \| IASI Level 1C band description sequence \|

\| IASICHN \| 361137 \| IASI Level 1C scaled radiance sequence \|

\| IASIL1CS \| 340004 \| IASI Level 1C AVHRR single scene sequence \|

\| AVHRCHN \| 361139 \| IASI Level 1C mean and std dev radiance sequence
\|

\| \| \| \|

\| SAID \| 001007 \| Satellite identifier \|

\| GCLONG \| 001031 \| Identification of originating/generating center
\|

\| SIID \| 002019 \| Satellite instruments \|

\| SCLF \| 002020 \| Satellite classification \|

\| YEAR \| 004001 \| Year \|

\| MNTH \| 004002 \| Month \|

\| DAYS \| 004003 \| Day \|

\| HOUR \| 004004 \| Hour \|

\| MINU \| 004005 \| Minute \|

\| SECO \| 004006 \| Second \|

\| CLATH \| 005001 \| Latitude (high accuracy) \|

\| CLONH \| 006001 \| Longitude (high accuracy) \|

\| SAZA \| 007024 \| Satellite zenith angle \|

\| BEARAZ \| 005021 \| Bearing or azimuth \|

\| SOZA \| 007025 \| Solar zenith angle \|

\| SOLAZI \| 005022 \| Solar azimuth \|

\| FOVN \| 005043 \| Field of view number \|

\| ORBN \| 005040 \| Orbit number \|

\| SLNM \| 005041 \| Scan line number \|

\| MJFC \| 025070 \| Major frame count \|

\| SELV \| 007001 \| Height of station \|

\| QGFQ \| 033060 \| Individual IASI-System quality flag \|

\| QGQI \| 033061 \| Instr. noise perf. indicator (spectral &
radiometric) \|

\| QGQIL \| 033062 \| Geometric quality index indicator \|

\| QGQIR \| 033063 \| Instr. noise perf. indicator (radiometric
calibration) \|

\| QGQIS \| 033064 \| Instrument noise perf. indicator (spectral
calibration) \|

\| QGSSQ \| 033065 \| Output of TEC function \|

\| AVHCST \| 025051 \| AVHRR channel combination \|

\| STCH \| 025140 \| Start channel \|

\| ENCH \| 025141 \| End channel \|

\| CHSF \| 025142 \| Channel scale factor \|

\| CHNM \| 005042 \| Channel number \|

\| SCRA \| 014046 \| Scaled IASI radiance \|

\| YAPCG \| 005060 \| Y angular position of center of gravity \|

\| ZAPCG \| 005061 \| Z angular position of center of gravity \|

\| FCPH \| 025085 \| Fraction of clear pixels in HIRS FOV \|

\| SMRA \| 014047 \| Scaled mean AVHRR radiance \|

\| SSDR \| 014048 \| Scaled standard deviation of AVHRR radiance \|

\| \| \| \|

\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MNEMONIC \| SEQUENCE \|

\|\-\-\-\-\-\-\-\-\--\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|

\| \| \|

\| NC021241 \| SAID GCLONG SIID SCLF YEAR MNTH DAYS \|

\| NC021241 \| HOUR MINU 202131 201138 SECO 201000 202000 \|

\| NC021241 \| CLATH CLONH SAZA BEARAZ SOZA SOLAZI \|

\| NC021241 \| FOVN ORBN 201133 SLNM 201000 \|

\| NC021241 \| 201132 MJFC 201000 202126 SELV 202000 \|

\| NC021241 \| QGFQ QGQI QGQIL QGQIR QGQIS QGSSQ \|

\| NC021241 \| \"IASIL1CB\"10 (IASICHN) \|

\| NC021241 \| SIID AVHCST \"IASIL1CS\"7 \|

\| \| \|

\| IASIL1CB \| STCH ENCH CHSF \|

\| IASICHN \| 201136 CHNM 201000 SCRA \|

\| IASIL1CS \| YAPCG ZAPCG FCPH \"AVHRCHN\"6 \|

\| AVHRCHN \| CHNM CHSF SMRA CHSF SSDR \|

\| \| \|

\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MNEMONIC \| SCAL \| REFERENCE \| BIT \| UNITS
\|\-\-\-\-\-\-\-\-\-\-\-\--\|

\|\-\-\-\-\-\-\-\-\--\|\-\-\-\-\--\|\-\-\-\-\-\-\-\-\-\-\-\--\|\-\-\-\--\|\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| \| \| \| \| \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SAID \| 0 \| 0 \| 10 \| Code table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| GCLONG \| 0 \| 0 \| 16 \| Code table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SIID \| 0 \| 0 \| 11 \| Code table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SCLF \| 0 \| 0 \| 9 \| Code table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| YEAR \| 0 \| 0 \| 12 \| Year \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MNTH \| 0 \| 0 \| 4 \| Month \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| DAYS \| 0 \| 0 \| 6 \| Day \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| HOUR \| 0 \| 0 \| 5 \| Hour \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MINU \| 0 \| 0 \| 6 \| Minute \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SECO \| 0 \| 0 \| 6 \| Second \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| CLATH \| 5 \| -9000000 \| 25 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| CLONH \| 5 \| -18000000 \| 26 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SAZA \| 2 \| -9000 \| 15 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| BEARAZ \| 2 \| 0 \| 16 \| Degree true \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SOZA \| 2 \| -9000 \| 15 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SOLAZI \| 2 \| 0 \| 16 \| Degree true \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| FOVN \| 0 \| 0 \| 8 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| ORBN \| 0 \| 0 \| 24 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SLNM \| 0 \| 0 \| 8 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| MJFC \| 0 \| 0 \| 4 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SELV \| 0 \| -400 \| 15 \| m \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGFQ \| 0 \| 0 \| 2 \| Code table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGQI \| 0 \| 0 \| 7 \| % \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGQIL \| 0 \| 0 \| 7 \| % \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGQIR \| 0 \| 0 \| 7 \| % \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGQIS \| 0 \| 0 \| 7 \| % \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| QGSSQ \| 0 \| 0 \| 24 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| AVHCST \| 0 \| 0 \| 7 \| Flag table \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| STCH \| 0 \| 0 \| 14 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| ENCH \| 0 \| 0 \| 14 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| CHSF \| 0 \| 0 \| 6 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| CHNM \| 0 \| 0 \| 6 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SCRA \| 0 \| 0 \| 16 \| W/m\*\*2/sr/m\*\*-1
\|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| YAPCG \| 6 \| -8000000 \| 24 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| ZAPCG \| 6 \| -8000000 \| 24 \| Degree \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| FCPH \| 0 \| 0 \| 7 \| Numeric \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SMRA \| 0 \| 0 \| 31 \| W/m\*\*2/sr/m\*\*-1
\|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| SSDR \| 0 \| 0 \| 31 \| W/m\*\*2/sr/m\*\*-1
\|\-\-\-\-\-\-\-\-\-\-\-\--\|

\| \| \| \| \| \|\-\-\-\-\-\-\-\-\-\-\-\--\|

\`\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\'