NASA

Contractor Report 175299

Philip Ardanuy

Lanning Penn

(HASa-CE-175299) OSERfS GUIDE AND TAPE 886-21428

SPECIFICATION FOB ERB 7 DELBAI (Besearch and

Data Systems, Inc.) 46 p HC S03/HF &01 .

CSCL 05B Unclas

G3/82 05678

NASA
NASA Contractor Report 175299

User's Guide and Tape Specification

for ERB 7 DELMAT

Philip Ardanuy

Lanning Penn

Prepared For.-

National Aeronautics and Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

Prepared By:

Research and Data Systems, Inc.

10300 Greenbelt Road

Lanham, Maryland 20706

Under Contract No. NAS 5-27728

Task Assignment 3

MARCH 1985

NASA

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771
Part I.

Section

I.

2.

3.

Appendix A

Appendix B

Part n

Appendix A

Appendix B

User's Guide and Tape Specification for ERB 7 DELMAT

TABLE OF CONTENTS

DELMAT User's Guide

Introduction

1.1 Purpose of the User's Guide

1.2 Project References

1.3 Terms and Abbreviations

Method of Calibration Adjustment

2.1 DELMAT

2.2 Calibration Adjustment Table

2.3 Calibration Overview

Summary of DELMAT Corrections

3.1 Midnight Offset

3.1.1 Description

3.1.2 Assumptions

3.2 Longwave Heating

3.2.1 Description

3.2.2 Assumptions

3.3 Shortwave Heating

3.4 Clipping

Examples of Supporting Documentation for

DELMAT Tapes

Internal Project References

DELMAT Tape Specification

Revisions

Abstract

I Requirement Identification

II Input Data Source

III Operation Mode

IV Gross Format

V Standard Header Specification

and Tape Documentation

VI General

V2 Standard Header Record

V3 Trailing Documentation File

V4 Tape Duplication

V5 Shipping Letters

VI Data Files

VII Existance of File Data on DELMAT

VIII Logical Data Record Descriptions

Tape Length Estimate (Version 1.0 and 2.0)

Procedure Status Word

1

1

1

3

4

4

5

5

7

7

7

17

i

7

7

9

10

15

18

19

20

21

21

21

21

24

24

25

26

28

28

29

29

30

38

40
NIMBUS 7

EARTH RADIATION BUDGET (ERB)

DELMAT USER'S GUIDE

Part I
SECTION 1. INTRODUCTION

1.1 Purpose of the User's Guide

The DELMAT User's Guide has been written to fulfill the following

objectives:

a. To provide guidance to the DELMAT user, primarily in the areas of the

purpose, use, and limitations of the DELMAT tapes and software.

b. To provide the DELMAT tape specifications to the user.

c. To summarize the input MATs and tape characteristics applicable to

the DELMAT tapes.

For a description of the Nimbus-7 Earth Radiation Budget (ERB) Experiment

and data products, the reader is referred to the references in section 1.2.

1.2 Project References

The Calibration Adjustment Task is performed by the ERB Processing Team

under the management of Dr. H. Lee Kyle (GSFC/Code 636), with the cooperation

of the Nimbus-7 ERB Experiment Team. The software has been developed for, and

is operated on, the GSFC SACC computers. The following documents are

references for this task:

1.2.1 Ardanuy, P.E, and J. Rea, Degradation Asymmetries and

recovery of the Nimbus-7 radiation budget shortwave radiometer,

J. Geophysical Research, In press, 1984.

1.2.2 Groveman, B.S., User's Guide for ERB-7 MAT, NASA Contractor

Report CR 170514, Goddard Space Flight Center, 1984.
1.2.3 Jacobowitz, H., H.V. Soule, H.L. Kyle, F. House, and the

Nimbus-7 ERB Experiment Team, The Earth Radiation Budget

Experiment: An Overview, J. Geophysical Research, 8_9, 5021-

5038, 1984.

1.2.4 Kyle, H.L., F. House, P. Ardanuy, H. Jacobowitz, R. Maschhoff,

and J. Hickey, New In-flight Calibration Adjustment of the

Nimbus 6 and 7 Earth Radiation Budget Wide Field of View

Radiometers, J. Geophysical Research, 89, 5057-5076, 1984.

1.2.5 Maschhoff, R., A. Jalink, J. Hickey and J. Swedberg, Nimbus

Earth Radiation Budget Sensor Characterization for Improved

Data Fidelity, J. Geophysical Research, 89, 5049-5056, 1984.

Additional internal references are given in Appendix B.

The algorithms used in the Calibration Adjustment Task were developed

cooperatively by the ERB Nimbus Experiment Team and the Goddard Space Flight

Center ERB Processing Team. The ERB Experiment Team has guided the Nimbus-7

ERB Experiment since 1976. Its members are listed below:

Jacobowitz, H. NOAA/NESDIS

Arking, A. NASA/GSFC

Campbell, G-G- CIRA, Colorado State University

Hickey, J.R. Eppley Lab, Inc.

House, F.B. Drexel University

Ingersoll, A. P. California Institute of Technology

Kyle, H.L. NASA/GSFC

Maschhoff, R. H. Gulton Industries, Inc.

Smith, G.L. NASA/LaRC

Stowe, L.L. NOAA/NESDIS

Vonder Haar, T. H. Colorado State University
1.3 Terms and Abbreviations

ERB - Earth Radiation Budget

VVFOV - Wide Field of View

BPI - Bytes Per Inch

CAT - Calibration Adjustment Table

TDF - Trailing Document File

DELMAT- MAT Monthly Calibration Adjustment Tape

PDELTA - Preliminary MAT Calibration Adjustment Tape

JCL - Job Control Language

GSFC - Goddard Space Flight Center

SACC - Science Applications Computing Center

RDS - Research and Data Systems, Inc.

NET - Nimbus Experiment Team
2. Method of Calibration Adjustment

Calibration adjustment of the ERB WFOV total (Channel 12), and filtered

channel shortwave (channel 13) and near-infrared (channel 14) radiometers is

accomplished through the application of several offset terms and a sensitivity

change. The DELMAT tape contains offsets describing the sensors' responses to

internal thermal gradients (termed the "midnight offset" because of the zero bias

at night) and to infrared absorption, warming, and subsequent reradiation by the

multiple filter domes (termed longwave heating). The Calibration Adjustment

Table, or CAT, contains a calibration adjustment slope which varies with a

modified solar zenith angle* and day of year. An additional empiricallydetermined offset is also provided.

2.1 DELMAT

The DELMAT tape contains one data-month's worth of calibration

adjustments for the correction of the filtered channel irradiances. The data month

begins on the first data day of the calendar month and extends beyond the end of

the calendar month to the last data day of the last ERB 6-day cycle begun in that

month. Thus, up to 5 days of the next calendar month may be included. The tape

specification document (Part ID describes the tape in detail. It is sufficient to

say here that there is one physical file per day. Each data day is as defined on the

respective MAT: data begins with the first orbit (starting at the first descending

node after 00:00:00 GMT) and terminates with the end of the last orbit (starting at

the last descending node prior to 23:59:59 GMT, and often extending into the next

calendar day). Neglecting data gaps, more or less than 24 hours of data will exist

in the day due to the 104-minute orbital period of the Nimbus-7 spacecraft.

The DELMAT is designed to complement, rather than replace, the MAT.

Therefore, an extensive amount of data, not pertinent to the calibration

adjustment problem, does not exist on the DELMAT, though it is available on the

MAT. What is retained, however, is a set of record identifiers and time tags,

enabling the matching of a DELMAT record to the corresponding MAT record.

Once a match has been made, instrument status words can be checked, as well as

the data quality loss interval flags and general data quality (the DELMAT contains

a summary status word) and the appropriate parameters extracted from each tape.

*To make the solar zenith angle a unique descriptor of orbit position, it is

multiplied by the sign of the rate-of-change of the solar zenith angle.
The DELiMAT calibration adjustments are additive. Where questionable data is

encountered, the DELMAT software employs interpolation algorithms (spline fit for

small saps, trend-matched zonal averages for large gaps) to replace the data. A

low-pass, 3-point (.25, .50, .25) filter is also employed to identically remove an

inherent every-other-observation oscillation in the data. To the user of filtered

channel irradiances (total channels are unchanged) there exist three options within

the DELMAT record; (I) the use of the uncorrected irradiances; (2) the use of the

uncorrected irradiances with the calibration adjustments added; or (3) the use of

the corrected irradiances.

Three versions of DELMAT tapes produced by three corresponding versions of

DELMAT software currently exist. Version 1.0 software produced by the

corresponding version of DELIMAT software was used to process data from May,

1980 through October, 1981. Version 2.0 software was used to process data from

November, 1981 through October, 1983. Version 3.0 software, used to process data

after October, 1983, is being used to reproduce DELMAT's for the prior time

period. The physical format of the three versions is presented in Part II. The

differences in algorithm are discussed in Section 3.

2.2 Calibration Adjustment Table

The Calibration Adjustment Table (CAT) contains empirically

determined slopes and offsets to be applied to each WFO V channel. These values

are presented in writing and are applied at MATRIX-level processing.

2.3 Calibration Overview

Figure 1 displays the ERB processing steps from the initia l spacecrafttransmitted data to final user products. The DELMAT and the channel 13 CAT are

used in conjunction with the original MAT in level-2 processing producing SEFDT

and MATRIX.
Figure 1 ERB Processing steps

6
3. Summary of D ELM AT Corrections

3.1 Midnight Offset

3.1.1 Description

The midnight offset correction is provided to remove the zero

bias evident at night from each of the two filtered channels- A midnight point is

defined for each orbit as that point in the orbit farthest from the sun (maximum

solar zenith angle). At this point the calibrated signal is extracted from the

shortwave and near-infrared radiometers. The former is corrected for longwave

heating. In general, 13 or 14 data points (one per orbit) are obtained for each day.

A cubic spline is fitted to these midnight points and evaluated at every observation

during the orbits.

3.1.2 Assumptions

It is assumed that the spacing of three shortwave-heating time

constants between the sunblips and the midnight points renders the shortwave

heating contamination of the midnight offsets negligible. In version 3.0, these

values are removed by adjusting the midnight offset correction. This removed a

slight residual error. Information from adjoining days is not included in the spline

fit for the day under consideration. A constant value of the midnight offset is

applied prior to the first midnight point and after the last midnight point to avoid

extrapolation. Estimates of longwave heating are removed from the channel 13

midnight values to yield an independent correction for zero bias. Because of the

one-data-point per orbit curve fit, the smallest oscillation that can be represented

has a period of two orbits; the primary correction is the removal of the ERB duty

cycle.

3.2 Longwave Heating

3.2.1 Description

The longwave heating offset correction is provided to remove the

variable channel 13 sensor response to infrared radiation. A constant response

correction is already applied in the count-to-irradiance calibration equation. It has

been shown that there is no significant 'longwave leak" through the pair of

Suprasil-W filter domes. Instead, the outer dome is subjected to a time-varying

incident longwave radiance field, modulated primarily by the equator-to-pole

terrestrial thermal gradient. This produces a temperature response in the dome
with a corresponding change in the amount of emitted longwave radiation. Some of

this radiation is absorbed by the inner filter dome, which changes temperature and

radiates, in part, onto the exposed radiometer. Unless corrected for, this response

is assumed to be due to incident shortwave radiation.

3.2.2 Assumptions

Laboratory studies on a prototype channel 13 radiometer, inflight

studies on the N-6 ERB Channel 13, as well as 2 years of data on the N-7 ERB

channel 13 all indicate that the double-dome longwave heating response is well

represented by a single point convolution of impulse response and longwave forcing.

Based on empirical studies, a constant phase lag of 21 major frames (approximately

5i minutes) is used along with a sensitivity of 4 percent. It is assumed that this

longwave heating response, based on the first 2 data-years, does not change with

time. The longwave heating response of channel 14, with 3 filter domes, is

assumed to be negligable. This appears on the tape as a fill value, 22222. The

algorithm for computing the channel 13 longwave heating correction is as follows:

DAY LWH = 0.04 *(CH 12 irrad. -CH 13 irrad.)

NIGHT LWH = 0.04 * CH 12 irrad.

3.3 Shortwave Heating

A large body of studies have shown that a shortwave heating response is

present in, at least, the filtered channel 13 and 14 irradiances- This is most

evident following a sunset sunblip, where psuedo-exponential decay curves with

time constants of 20 and 30 major frames, respectively, for channels 13 and 14

are observed. Through some geometric simplifications, the amount of shortwave

forcing can be computed, allowing the determination of appropriate sensitivities.

These are noted to generally increase and decrease for channels 13 and 14,

respectively, with time as the channels degrade.

What is uncertain is in the transfer of this model from direct solar to

terrestrial-reflected solar radiation. Because this effect proved impossible to

properly replicate under laboratory conditions, this model was not implemented to

describe terrestrial reflected shortwave heating responses. In version 1.0 and 2.0,
the shortwave heating correction for both channel 13 and 14 is set to zero. In

version 3.0, the direct solar correction is used, while the terrestrial-reflection

correction is set to zero.

3.4 Clipping

In the version 3.0 DELMAT, two additional corrections are added, and

they are jointly referred to as clipping corrections. The first involves the

interpolation across, or "clipping" of, all sunblips. Using a tensioned spline

interpolation, channels 12, 13 and 14 are estimated for the region between solar

zenith angles 90° and 121°.* The difference between these interpolated values

(with all other applicable corrections applied) and the original sunblip irradiance is

stored for each channel as the clipping correction. In addition, after all applicable

corrections are applied, all channel 13 and 14 irradiances at solar zentih angles

greater than 121° are set to zero. The difference between these corrected

irradiances and zero are also stored as clipping corrections.

* The irradiances for all VVFOV channels are reduced in the SZA region 90° to 99o

to eliminate the out-of-field response observed in this region prior to using them as

knots for the interpolation.
APPENDIX A

The

 following is

10
• Summary of Input MAT's Used to Produce Year-2 DELMAT Tapes

The following MAT's were used to produce the May, 1980 DELMAT tape AJ01211-2

DATE JULIAN DAY SEQUENCE NUMBER

May 1, 1980

May 2, 1980

May 3, 1980

May 5, 1980

May 6, 1980

May 7, 1980

May 9, 1980

May 10, 1980

May 11, 1980

May 13, 1980

May 14, 1980

May 15, 1980

May 17, 1980

May 18, 1980

May 19, 1980

May 21, 1980

May 22, 1980

May 23, 1980

May 25, 1980

May 26, 1980

May 27, 1980

May 29, 1980

May 30, 1980

May 31, 1980

June 2, 1980

June 3, 1980

June 4, 1980

122

123

124

126

127

128

130

131

132

134

135

136

138

139

140

142

143

144

146

147

148

150

151

152

154

155

156

AC07951A3

AC07961A3

AC07971A3

AC08021A3

AC08031A3

AC08041A3

AC08061A3

AC08071A3

AC08111A3

AC08131A3

AC08141A3

AC08151A3

AC08171A3

AC08211A3

AC08221A3

AC08241A3

AC08251A3

AC08261B3

AC08311A3

AC08321A3

AC08331B3

AC08351A3

AC08361A3

AC08371A3

AC08421A3

AC08431A3

AC08441A3

11
The following MAT's were used to produce the June, 1980 DELMAT tape AJ01521-2

DATE JULIAN DAY SEQUENCE NUMBER

June 2, 1980

June 3, 1980

June 4, 1980

June 6, 1980

June?, 1980

June 8, 1980

June 10, 1980

June 11, 1980

June 12, 1980

June 14, 1980

June 15, 1980

June 16, 1980

June 18, 1980

June 19, 1980

June 20, 1980

June 22, 1980

June 26, 1980

June 27, 1980

June 28, 1980

June 30, 1980

July 1, 1980

July 2, 1980

July 4, 1980

July 5, 1980

154

155

156

158

159

160

162

163

164

166

167

168

170

171

172

174

178

179

180

182

183

184

186

187

AC08421A3

AC08431A3

AC08441A3

AC08461A3

AC08471A3

AC08511A3

AC08531A3

AC08541A3

AC08551A3

AC08571A3

AC08611A3

AC08621A3

AC08641A3

AC08651A3

AC08661A3

AC08711A3

AC08751A3

AC08761B3

AC08771A3

AC08821A3

AC08831A3

AC08841A3

AC08861A3

AC08871A3

12
. Summary of Year-2 DELMAT Tape Characteristics

May. 1980; Sequence Number: AJ01211-2

FUe Julian

Number Day

1

2

3

4

5

8

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

122

123

124

126

127

128

130

131

132

134

13S

136

138

139

140

142

143

144

146

147

148

150

151

152

154

155

156

-

Orbital 1

Span ]

HEADER

7668-7680

7881-7894

7695-7708

7723-7736

7737-7750

7751-7763

7778-7791

7792-7805

7806-7818

7834-7846

7847^7860

7861-^874

7889-7902

7903^915

7916-7929

7944-7957

7958^7971

7972^7985

7999-8012

8013-8026

8027-8040

8055-8067

8068-8081

8082-8095

8110-8123

8124-8137

8138-8150

TDF

»hysieal

Accords

2

26

28

28

28

28

26

28

28

26

26

28

27

28

26

28

27

28

26

28

28

28

26

28

28

28

28

26

29

Logical

Data

Records

5045

5421

5392

5443

5440

5004

5423

5401

5049

5043

5437

5383

5430

5064

5386

5302

5441

4682

5426

5433

5021

5053

5439

5419

5427

5451

5036

Orbital

Summary

Records

(13

14

14

14

14

13

14

14

13

13

14

14

14

13

14

14

14

14

14

14

14

13

14

14

14

14

13

Daily Fill

Summary Data

Records Records

2

1

2

1

2

1

1

1

2

2

1

1

2

1

2

2

1

1

2

1

2

2

1

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

359

0

0

365

0

0

0

0

0

0

Total

Logical

Records

5060

5436

5408

5458

5456

5018

5438

5416

5064

5058

5452

5398

5446

5078

5402

5318

5456

5056

5442

5448

5402

5068

5454

5434

5442

5466

5050

13
June, 1980; Sequence Number: AJ01521-2

FUe

Number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

Julian

Day

-

154

155

156

158

159

180

182

163

164

186

187

168

170

171

172

174

178

179

180

182

183

184

186

187

-

Orbital

Span

HEADER

8110-8123

8124-6137

8138-8150

8165-8178

8179-6192

3 193 -€206

8220-8233

8234-8247

8248-8281

8276-8289

8290-8302

8303-8318

8331-8344

8345-8358

8359-8371

8386-3399

8442-8454

8455-4468

8469-8482

8497-6510

8511-8523

8524-8537

8552-8565

8566-8579

TDF

Physical

Records

2

28

28

28

28

28

28

28

28

28

28

28

28

28

28

28

26

23

28

27

28

28

28

28

27

36

Logical

Data

Records

S427

5451

5036

5410

5433

5432

5408

5442

5424

5415

5028

5404

5442

5439

5046

5031

4576

5387

5371

5431

5039

5433

S448

5368

Orbital Daily Fill Total

Summary Summary Data Logical

accords Records Records Records

14

14

IS

U

14

14

14

14

14

14

13

14

14

14

13

14

13

14

14

14

13

14

14

14

1

1

1

2

1

2

2

2

2

1

1

2

2

1

1

1

1

1

1

1

2

1

2

2

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

5442

5466

5050

5426

5448

5448

5424

5458

5440

5430

5042

5420

5458

5454

5060

5046

4590

5402

5386

5446

5054

5448

5464

5384

14
Appendix B

Internal Project References

B.1 "Nimbus-7, Nimbus Observation Processing System (NOPS)

Requirements Document #NG-13 Tape Specifications No. T1B4081 ERB

MAT, ERB MASTER ARCHIVAL TAPE", Goddard Space Flight Center.

B.2 "The Nimbus-7 User's Guide", the Landsat/Nimbus Project, Goddard

Space Flight Center.

B.3 "Federal Information Processing Standards", FIPS Publication 38,

National Bureau of Standards, Feb. 15, 1976.

B.4 "The Channel 13 Dome Heating Problem", Giannola, R. J. JaFolia and F.

House, Minutes of the Ninth ERB Science Team Meeting, Attachment

H, December 1977.

B.5 "Channels 13 and 14 Dome Heating Problem", Giannola R. and F. House,

Minutes of the Tenth ERB Science Team Meeting. Attachment L,

March 1978.

B.6 "Sunblip and Dome Heating Considerations", Giannola, R. and F. House,

Minutes of the Thirteenth ERB Science Team Meeting, Attachment G,

April 1979.

B.7 "Untitled Progress Report", Giannola, R. and F. House, Minutes of the

Fifteenth ERB Science Team Meeting, Attachment H, January, 1980.

B.8 "Study of the Dome Heating Problem and Science Support of the

Nimbus ERB Reprocessing Team", House, F., Technical Proposal

submitted to Goddard Space Flight Center, September 1981.

15
B.9 "Thermal Analysis of Earth Flux", Maschhoff, R. and J. Swedberg,

Minutes of the Eighteenth ERB Science Team Meeting, Attachment F,

November, 1981.

B.lO "Data Comparison Calibration Strategy", House, F. Minutes of the

Eighteenth ERB Science Team Meeting, Attachment G, November, 1981.

B.11 "Thermal Analysis of Earth Flux", Maschhoff, R., Minutes of the first

ERB Calibration Workshop, Attachment D, August 1982.

B.12 "Asymmetric Degradation of the Nimbus-7 ERB Shortwave Channel",

Ardanuy, P., Minutes of the First ERB Calibration Workshop,

Attachment E, August, 1982.

B.13 "Review of the Nimbus-7 ERB CAT Process and Results", fromm, K,

August, 1982.

B.14 "Nimbus-7 ERB MAT Calibration Adjustment Task, Functional

Requirements Document", Ardanuy, P., October, 1982.

B.15 "Nimbus-7, Nimbus Observation Processing System (NOPS),

Requirements Document Tape Specification No. T134101, ERB DELMAT,

ERB WFOV Calibration Adjustment Tape", Ardanuy, P., October, 1982.

B.16 "ERB Earth-Flux Channel Thermal Analysis", Hickey, J-, Minutes of the

Eighteenth ERB Science Team Meeting, Attachment November, 1981.

B.17 "Nimbus-7, Nimbus Observation Processing System (NOPS), ERB

SEFDFIX Requirements Specification", Yang, C-, Systems and Applied

Sciences Corp., October 1982.

16
B.18 "Nimbus-7, Nimbus Observation Processing System (MOPS), ERB

MATRIX Modification for DELMAT Acceptance", Yang, C. and J.

Neuberger, Systems and Applied Sciences Corp., October, 1982.

B.19 "Nimbus-7 ERB MAT Calibration Adjustment Task, DELTA MAT

Program Specifications", Ardanuy, P., October, 1982.

B.20 "Report to the Nimbus ERB NET Working Meeting, November 27-28,

1984". Ardanuy, P., Groveman, B., Hucek, R,, Penn, L., Weiss, M. et al-,

November, 1984.

17

NIMBUS-7

NIMBUS OBSERVATION PROCESSING SYSTEMS (NOPS)

TAPE SPECIFICATION NO. T-13401

ERB DELMAT

18
Revisions

Revision A:

11/30/82

Revision B:

1/24/83

Physical record length changed to 24084 bytes to satisfy IPD

requirement that the block length be compatible with 24, 32 and

36 bit machines. Changes exist on pages 20, 38 and 39.

Scale factor for solar zenith angle corrected to read 100.

Explanation for the existance of fill data added. Changes exist on

pages 29 and 36.

Revision C: Subsatellite latitude and longitude added to previously spare

10/19/83 words. This change represents version 2 of the DELMAT

algorithm. Changes exist on pages 32 and 37.

Revision D: Shortwave heating correction activated, sunblip clipping initiated.

11/15/84 This change represents version 3 of the DELMAT algorithm.

Changes exist on pages 20, 29, 33-38.

19
ABSTRACT

The ERB DELMAT TAPE is generated by software residing on an IBM 3081

computer and is created as a 9 track 1600 BPI product- It is composed of a set of

files; the first file contains the standard header record written twice, the last file

contains all the trailing documentation records and each intermediate file will

contain one day of data. A tape length calculation is provided in Appendix A.

This tape has been generated in a manner so as to facilitate processing with the

MAT data. The following differences and similarities are worth noting:

1. Word 1, while containing data unique to this product, is identical in format

to word 1 of each MAT logical record.

2. The MAT data file (file 2) contains several thousand physical records.

Each MAT physical record contains two logical records, corresponding to up

to two VIP major frames (16 seconds) of data.

3. Except for the first and last files, each DELMAT tape file contains

approximately 30 physical records. Each physical record (24,084 bytes)

contains 100 logical records- Each logical record (240 bytes) corresponds

to a single physical record on the appropriate MAT. The last 84 bytes are

spares and contain no useful information. For DELMAT versions 1.0 and 2.0,

each physical record contains 24,084 bytes and each logical record 240 bytes.

For version 3.0, each physical record contains 31,500 bytes and each logical

record 3l2 bytesDue to a maximum of two dropped physical records in the MAT copy process,

occasionally a 1:1 MAT to DELMAT tape record comparison based on time-tagging

will not be possible. In these isolated cases the user may either drop the mismatched data from further processing or, in the case of versions 1 and 2, only use

corrections from a neighboring record.

20
II.

III.

REQUIREMENT IDENTIFICATION

ERB DELMAT, tape specification number T134101, PDF code AJ.

INPUT DATA SOURCE

ERB-MAT, tape specification number T134081, PDF code AC.

OPERATING MODE

The DELMAT program will generate one tape for every month of data.

The tape will have one standard header file, one trailing documentation

file and one additional file for every "ERB-ON" day in the month.1

IV.

! STD I

i

 R

HDR. G

GROSS FORMAT

The Gross Format is as shown below:

STD! E

HDR! F

DELTA

PHYREC

j

I

R

G

DELTA

PHYREC

2

I 1

R

 1 r

-

G

_L /

i

R

G

LAST E

DELTA O

PHYREC F

File 1 File 2 (Day 1)

DELTA !

PHYREC !

1 1

I

R

G

DELTA I : I LAST

PHYREC

2

R

G

' R

1 G / / •.

DELTA '

PHYREC

E

0 '

F

Next to Last File (Last Day)

'I'

D

F

I

R

G

T I

R

G

' ' ,1

, , I S

T E

D | 0

F ' F

E

0

F

Last File

The number of physical records will vary with the number of orbits/day. The

number of files will vary with the number of "ERB-ON" days/month.

- A data month is defined here as that time span allowing data to complete the last

cycle started prior to the end of the calendar month.

21
ORIGINAL PAGE 53

OF POOR QUALITY

Tot tl

3; bit r.:sa

words 24 22 20 18 IS 14 12 10 8

i

8

9

10

13

14

IS

16

17

18

19

20

21

22

29

36

42

84

126

ies

21C

LS3

642 1

- Nimbus - 7 NOPS.SPEC. KO.T

L-TJ ror «xi*ts » o b

(24 Characters)

SPEC NO. (6 Digits)

bSQbKOb (7 Characters)

PD'FC" CODE

S Digit Sequence No. (5 Character*) YJJJN

* roF C2C2> tiese cniffACters (40*^5) AC* A

six diaic sequence »( includes Redo)

1 Char. Tape Copy No Blank Character

(4 Characters) SUBSYSTEM I.D.

Blank Character SOLTICE FACILITY

(4 Characters)

(T) Character (3) Character

(2 Char. )

REDO CHARACTER

Blank Character

Blank Character

(4 Characters) DESTINATION FACILITY I.D.

(23 Characters)

START YEAR, DAY, HOURS. MINUTES. SECONDS

bSTARTb19XXbDDD HHMMSS.

E.ND DATE AND TIME OF DATA (19 Characters)

TO. 19XX ODD. HHMMSS. • Some Facilities may not

0

 include end time in header

(20 Characters)

DATE AKD TIME TAPE TAS GENERATED

C-nN' 1 9XX. DDD. HHMMSS.

0 D- D Q

BLAHK (126 Characters^

SW Program Name (1-12) OocuacntACion (13-18) Comments (19-126)

BLAKK (128 Characters)

BLAN'K (126 Characters)

BLANK (126 Characters)

EBCDIC TAPE FORMAT

Total

Bits

192

408

696

1008

2016

3024

4032

5040

Figure V -1. Standard Header (Physical Record Format)

(1 Character = 8 bits)

22
. Table V-l

NOPS Specification Numbering Code

TA * yT x x X X X

1 -

k —

Source

Desti

V

Tape Description:

1-9 Trk 1600 BPI

2-9 Trk 800 BPI

3-7 TrX 800 BPI

4 - 7 Tr* 556 BPI

5 - HDT (IPD)

6-9 Tr* 6250 BPI

Tape number in

sequence for subsystem

(code to be derived)

nation

Facilitv

1 NOC (Pre-NOPS)

2 MDHS (NOPS)

3 SACC

4 IPD

5 LaRC

6 NCAR

7 NOAA

8 OXFD

9 LANN

Facility

(Same code as

Destination Facility)

ERB

2 - SMMR

3 - THIR TAPES : A six digi t numbe r prefixe d wit h

4 - SAM2 a T to denote TAPE wil l be used .

5 - LIMS

6 - SBUV Rev . D adds 6250 bpi tapes as a possibl e

7 - C2CS product

a - SAMS

9 - ILT

23
V. STANDARD HEADER SPECIFICATION AND TAPE DOCUMENTATION

V.I GENERAL

All computer compatible tapes (CCTs) that are used as interfaces within NOPS

require some form of identification. This applies to all CCTs that are currently

defined by a NOPS tape specification, and that are also used for distribution or

archiving purposes.

In addition to defining a "latest" product, data relating to previous products that

went into the making of the 'latest" product provides useful information when

system problems occur.

The purpose of this revision to existing NOPS take specifications is to define a

scheme that allows the recording of the genealogy of a 'latest" product, and in

general adheres to existing tape documentation standards.

In brief the system is as follows:

1. A documentation file that consists of a string of physical records follows the

data on any tape defined by a current NOPS tape specification. This will be

referred to as a Trailing Documentation File (TDF), and is the last file on a

tape when it exists.

2. The standard NOPS header file remains as defined, with minor modifications

to the standard header record that reflects both the existence of a TDF and

adherence to the IPD standard for sequence numbers.

The following sections define the NOPS standard header records and file, and the

TDF. Data files as currently defined in NOPS tape specification remain

unchanged.
V.2 STANDARD HEADER RECORD (SHR)

The SHR will consist of one physical record that consists of 5 logical .records of 126

EBCDIC characters. The first 126 characters will remain as previously defined

with the exception of character 1 and those characters that define the sequence

number (40-45). Character 1 will contain an asterisk (*) and serve to notify all

systems that a TDF is likely to follow the main data files and that the next logical

record contains information relevant to complete identification. As of the

implementation date of this specification, all sequence numbers will have the

following IPD standard form:

Character 40 =The last digit of the year in which the data were acquired.

Character 4M3 =Julian day of the year in which the data were acquired.

Character 44 =Sequence number for this particular product (usually l)

(e.g., CLDTs will have a 1 and 2, as there are 2 products per

day).

Character 45 =The existing hyphen remains unless there is a remake of

the tape for any reason. In this case, an ascending alpha

character will replace the hyphen, and the most recent

reason for remake will be recorded in logical record 4 of the

header.

Character 47 =This will remain as a blank unless it is needed to remove

ambiguities in Character 40. This may occur if data are

being acquired on October 24, 1988.

This scheme will uniquely identify any tape when used in conjunction with the tape

specification number, the PDFC code, and the subsystem identification.

The second logical record consisting of 126 characters will contain information that

is required to complete the history of the product.

25
Character 1-12 =Software program name and version number.

Character 13-18 =Program documentation reference number, if it exists.

Character 20-126 =User defined comments that may be more relevant to the

user than the preceding ones.

The MOPS standard header file will continue to consist of 2 records, the second

being a duplicate of the first. Logical records 3 and 4 may be used for anything

desired if no remake information is required.

V.3 TRAILING DOCUMENTATION FILE (TDF)

The TDF will consist of all NOPS standard header records (non duplicated) that

relate to products that have gone into the making of the current product.

Documentation records will be sequenced in accordance with their access; that is

first in is the first recorded. Every TDF is 630 bytes in length.

The first record of this file will serve to identify the file as a TDF. This will be

accomplished by placing asterisks in Characters 1 to 10 followed by NOPS TRAILER

DOCUMENTATION FILE FOR TAPE PRODUCT TtSPEC NO (6 digits))

GENERATED ON ODD HH MM. The exact spacing of this comment is noncritical

as long as it is less than 116 characters. The second physical record will be a repeat

of the header file NOPS standard header record for this type with the proviso that

data referring to the end-time are correct for the data set. Following physical

records will be an accumulation of TDFs of all input tapes. For those products that

require more than one tape, the TDF and the warning asterisk will appear on the

last tape only.

The STD HDR will contain the following:

Two identical records (physical) of 630 characters (eight bits each followed by an

end-of-file.)

The first 126 characters of the first record will consist of:

NIMBUS-7bNOPSbSPECbNObT (1-24 Character Count)

optional

26
XXXXXX (96 digit spec number) (25-30 Character Count)

bSObNO (31-37 Character Count)

AA XXXXX (5 digit sequence number) (38-44 Character Count)

NOTE: *If sequence number is zero, tape is not finished product

(i.e., definitive ephemeris not used, artificial VP data, etc.)

redo character

-X (copy number 1 or 2) (45,46 Character Count)

bYYYYb (4 character subsystem ID) (47-52 Character Count)

YYYY (Generation Facility CD) (53-56 Character Count)

bTObYYYY (4 Character Designated Fac.ID) (57-64 Character Count)

bSTARTbl9XXbDDDbHHMMSSb (65087 Character Count)

(Start year, day of year, hours, minutes, seconds)

bTOblSXXbDDDbHHMMSSb (88-106 Character Count)

(End data and time of data)

GENt>l9XXbDDDbHHMMSSb (107-126 Character Count)

(Data and time tape was generated)

The second group of 126 characters will contain continuation documentation of the

original 126 characters when required.

The third, fourth, and fifth groups of 126 characters each are intended for the use

of the subsystem analysts for further identifications of their data. They may

contain blanks, EBCDIC, BDC, or binary characters or zeros.

The second record in the file is a duplicate of the first record for redundancy.

The PDFC codes are as defined in Table V-2.

27
Example: An ERB Matrix tape covering the month of February 1979 is generated

SACC and sent to IPD for production of contour maps on 16 mm microfilm.

The NOPS STD HDR file on the tape that IPD received would contain two of

the following records-

*NIP/lBUS-7NOPSbSPECbNODTl3403lbSQ0NOb

1st day of time period

AA9032l-2bERBbbSACCbTObIPDbSTAR1\)l979b

032b000432bTObl979b059b235742bGENb

I979bl04b094500bfollowed by 504 blanks

First day of time period may not be first data day in the event of multiday-stacked products that are based on an ILT week.

V.4 TAPE DUPLICATION

Because of the real possibility of an original tape being damaged in handling

(resulting in the loss of many computations), each processing facility within NOPS

will generate duplicate copies of master tapes. These duplicates will be delivered

to IPD for data product generation or user copy generation and will be indicated by

the characters "-2" added to the sequence number in the STD HDR. The original

will be indicated by the characters "-1" and will be retained in a secure

environment nt the originating facility. When IPD returns copy #2 due to tape

errors, a new copy will be sent to IPD with the same copy number, but identified on

the tape cannister as "-2 A", then "-2 A", the "-2B" for a subsequent redo, etc.

V.5 SHIPPING LETTERS

IPD will include a shipping letter with every tape distributed. The shipping letter

will be printed directly from the first 126 (or 138) characters of the first physical

record of the Standard Header File (SHF). In the event of copies made from CCTs

that are not generated in IPD, a new physical record reflecting IPD as the source

and the Nimbus experimenter to whom the tape is being sent as the destination,

will be added as the second record of the TDF. All existing records in the TDF will

be pushed down, but none will be lost. This record should also replace those in the

SHF.

28
VI. DATA FILES

There is a single type of logical record in each physical record. The logical

records each contain data corresponding to one physical record, or two

logical records, on the MAT. These may correspond to VIP major frames of

data, orbital summaries, daily summaries or fill data records- There are 100

of these 240 byte (312 byte for revision 3.0) logical records placed in each

physical record (approximately i orbit of data). The data is time-tagged in a

manner identical to the appropriate MAT records (words 2 and 3) and, with

the exception of words 1, 2, and 4, 22222 filled for all but VIP major framesThe logical data record format and description is presented in subsections VIA and VI-a

VI1.EXISTANCE OF FILL DATA ON DELMAT There are three conditions under

which irradiance data on the DELMAT tape were replaced with fill (22222)

data. These are:

(1) Record type 54; This indicates the existence of a mis-located

major frame of data- All corrected irradiance data is filled for

this 16 second period.

(2) Record types 52 and 53: These indicate the existence of orbital

and daily summary records and are placed in the DELMAT to

maintain conformity with the MAT. As no irradiances exist for

these records, the corresponding DELMAT words are filled.

(3) Record type 51 (channel 14 longwave heating correction): As no

correction for the longwave heating response for channel 14 yet

exists, the corresponding DELMAT words are filled.

29
LOGICAL DATA RECORD DESCRIPTIONS

Each logical record contains a combination of 2 major frames of data, orbital

summaries, daily summaries or fill data. Figure 1 is the format for version 1

tapes (prior to November 1981) and Figure 2 is the format for version 2 tapes

(November 1981 through October 1983), and Figure 3 is the format for version

3 tapes (November 1983 and following).

1. Physical Record Number (12 bits): This identifies the physical record

within a data file. This number should range from 1 to approximately

28 for each day (file) of data.

2. Record I.D. (8 Bits): This identifies the record type, the last record

written in a file and records in the last file in the tape. The MSB will

be set to "1" if that record is the last one written in the file. The

second MSB will be set on all records in the last file on the tape. The

record type will use the 6 LSB of that byte to identify the type of

record being used,

51 = Logical Data Record

52 = Orbital Summary Record

53 = Daily Summary Record

54 = Fill Data Record

3. Logical Record Number (8 Bits); This identifies the logical record

within the physical record. The number ranges from 1 to exactly 200

for each physical record.

4. Year (16 Bits): The least two significant numbers of the calendar year

(e.g., 82) for the first of the two corresponding MAT logical records5. Day of Year (16 Bits): The day of the year (1 to 366) for the first of the

two corresponding MAT logical records6. Hour/Minute (16 Bits): The GMT hour and minute (100 "hours/1

- minute)

of the start of data for the first of the two corresponding MAT logical

records.

30
ORIGINAL IS

OF POOR QUALITY

LOGICAL DATA RECORD FORMAT

DELMAT Version 1

WORD

1

2

3

4

12

14

16

18

20

22

24

26

28

29

30

60

MSB

32

LSB

1

TEAR (16)

HOPR/MINPTE (16)

ORBIT NO. (16)

PHYSICAL REC. HO. (12) SPARES (4) FILE COHT (2) REC I.D (6) LOGICAL REC. NO.(8)

DAY OF TEAR (16)

CMT SECONDS (16)

STATUS WORD (16)

CHANNEL 11-14 (WTOV) OKCORRECTED MAT IRRADIANCES (256)

CHANNEL 13 MIDNIGHT OF7SET CORRECTIONS (64)

CHANNEL 13 LONGWAVE HEATING CORRECTIONS (64)

CHANNEL 13 SHORTWAVE HEATTNC CORRECTIONS (64)

CHANNEL 13 REPLACEMENT IRRADIANCES (64)

CHANNEL 14 MIDNIGHT OFFSET CORRECTIONS (64)

[CHANNEL 14 LONGWAVE HEATING CORRECTIONS (64)

CHANNEL 14 SHORTWAVE HEATING CORRECTIONS (64)

CHANNEL 14 REPLACEMENT IRRADIANCES

SOLAR ZEHTTH ANCLE (16)

(64)

SPARES (16)

SPARES (32)

AS IR MORDS 1-30 BOT TOR MAT LOGICAL RECORD 2 (960)

BIT .

3i

64

96

128

384

448

512

576

640

704

768

832

896

928

960

Figur e 1 DELMAT format

31
LOGICAL DATA RECORD FORMAT

WORD MSB

32

1

2

3

4

12

14

16

18

20

22

24

26

28

29

30

60

PHTSICAL REC. HO. (12)

TEAR (16)

HOUR/MINUTE (16)

OMIT HO. (16)

DELMAT Version 2

LSB BIT

1

SPARES (4) FILE CONT (2) REC. I.D. (6) LOGICAL REC. NO. (8)

DAT OF TEAR (16)

GMT SECONDS (16)

STATUS WORD (16)

CHANNEL 11-14 (WPOV) ONCORRECTED MAT IRRADIANCES (256)

CHANNEL 13 MIDNIGHT OFFSET CORRECTIONS (54)

CHANNEL 13 LONGWAVE HEATING CORRECTIONS (64)

CHANNEL 13 SHORTWAVE HEATING CORRECTIONS (64)

CHANNEL 13 REPLACEMENT IRRADIANCES (64)

CHANNEL 14 MIDNIGHT OFFSET CORRECTIONS (64)

CHANNEL 14 LONGWAVE HEATING CORRECTIONS (64)

CHANNEL 14 SHORTWAVE HEATING CORRECTIONS (64)

CHANNEL 14 REPLACEMENT LUADIANCES (64)

SOLAR ZENITH ANCLE (16) LATITUDE (16)

LONGITUDE (16) SPARES (16)

AS IN WORDS 1-30 BUT FOR MAT LOGICAL RECORD 1 (960)

32

64

96

128

384

448

512

576

640

704

768

832

896

928

960

Figure 2 DELMAT format

32
LOGICAL DATA RECORD FORMAT

ORD

1

2

3

4

12

14

16

18

20

22

24

26

2B

30

32

34

36

37

38

39

78

MSB

32

PHYSICAL REC. NO. (12)

TEAR (16)

ROUR/KINUTE (16)

ORBIT HO. (16)

DELMAT Version 3

LSB

1

SPARES (4) FILE CONT (2) REC I.D. (6) LOGICAL REC. NO. (8)

DAY OF TEAR (16)

CHT SECONDS (16)

STATUS WORD (16)

CHANNEL 11-14 (WTOV) miCORRECTED MAT IRRADIANCES (256)

CHANNEL 12 CLIPPING CORRECTIONS (64)

CHANNEL 12 REPLACEMENT IRRADIANCES (64)

CHANNEL 13 CLIPPING CORRECTIONS (64)

CHANNEL 13 KIDNICHT OFFSET CORRECTIONS (64)

CHANNEL 13 LONGWAVE HEATING CORRECTIONS (64)

PANNEL 13 SHORTUAVE HEATING CORRECTIONS (64)

CHANNEL 13 REPLACEMENT IRRADIANCES (64)

CHANNEL 14 CLIPPING CORRECTIONS (64)

CHANNEL 14 KIDNTCHT OFTSET CORRECTIOHS (64)

CHANNEL 14 LONGWAVE HEATING CORRECTIONS (64)

CHANNEL 14 SHORTWAVE HEATING CORRECTIONS (64)

CHANNEL 14 REPLACEMENT IRRADIANCES (64)

SOLAR ZENITH ANCLE (16) LATITUDE (16)

LONGITUDE (16) SPARES (16)

SPARES (32)

km in word* 1-39 But for MAT Loticml Record 2 (1248)

BIT

32

64

96

128

384

448

512

576

640

704

768

832

896

960

1024

1088

1152

1184

1216

1248

2496

Figure 3 DELMAT format

33
7. GMT Seconds (16 Bits): The GMT seconds (0 through 59) of the start of

data for the first of the two corresponding MAT logical records.

8. Orbit Number (16 Bits): The orbit data block number associated with

the first of the two corresponding MAT logical records9. Status Word (16 Bits): This indicates the procedure used in obtaining

the irradiance corrections for the first of the two MAT logical records.

A detailed description is found in Appendix B.

10. Unconnected MAT WFOV Irradiances (256 Bits); 4 irradiances * 4

channels * 16 Bits = 256 Bits. These are the uncorrected channel 11-14

WFOV irradiances copied without change from the first of the two MAT

logical records. (WrrT^ with a scale factor of 10).

11. Channel 12 Clipping Corrections (64 Bits); 4 corrections *16 Bits = 64

Bits- Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 12 irradiances, removes the sunblip

contamination of the channel. Version 3.0 only. (Wm~^ with a scale

factor of 10).

12. Channel 12 Replacement Irradiances (64 Bits); 4 irradiances *16 Bits =

64 Bits. Four irradiances which have been corrected for the effect

described above for the first of the two corresponding MAT logical

records. These are replacement irradiances for the channel 12

irradiances existing on the MAT. Version 3.0 only. (Wm~^ with a scale

factor of 10).

13. Channel 13 Clipping Corrections (64 Bits): 4 corrections *16 Bits = 64

Bits- Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 13 irradiance removes the sunblip
contamination of the channel, and in concert with other corrections,

zeros the channel at night. Version 3.0 only. (Wm~ 2 with a scale factor

of 10).

14. Channel 13 Midnight Offset Corrections (64 Bits): 4 corrections * 16

Bits = 64 Bits. Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 13 irradiances removes the zero-bias of the

channel. (WrrT2 with a scale factor of 10).

15. Channel 13 Longwave Heating Corrections (64 Bits); 4 corrections * 16

Bits = 64 Bits- Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 13 irradiance removes the longwave heating

response of the channel. (Wm~^ with a scale factor of 10).

16. Channel 13 Shortwave Heating Corrections (64 Bits): 4 corrections * 16

Bits = 64 Bits. Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 13 irradiances removes the shortwave heating

response of the channel. (Wm~2 with a scale factor of 10). (Not used,

always equal to zero in versions 1.0 and 2.0).

17. Channel 13 Replacement Irradiances (64 Bits): 4 irradiances * 16 Bits =

64 Bits. Four irradiances which have been corrected for the effects

described above for the first of the two corresponding MAT logical

records. These are replacement irradiances for the channel 13

irradiances existing on the MAT. (Wm~2 with a scale factor of 10).

18. Channel 14 Clipping Corrections (64 Bits): 4 corrections *16 Bits = 64

Bits. Four irradiance corrections terms for the first of the two

.corresponding MAT logical records. When added to the appropriate

35
uncorrected MAT channel 14 irradiance removes the sunblip

contamination of the channel, and in concert with other corrections,

zeroes the channel at night. Version 3.0 only. (Wm~2 with a scale

factor of 10).

19. Channel 14 Midnight Offset Corrections (64 Bits): 4 corrections * 16

Bits = 64 Bits. Four irradiance correction terms for the first of the two

. corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 14 irradiances removes the zero-bias

response of the channel. (Wm~2 with a scale factor of 10).

20. Channel 14 Longwave Heating Corrections (64 Bits): 4 corrections * 16

Bits = 64 Bits. Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 14 irradiances removes the longwave heating

response of the channel. (Wm~2 with a scale factor of 10). (Not used,

always filled with 22222.)

21. Channel 14 Shortwave Heating Corrections (64 Bits); 4 corrections * 16

Bits = 64 Bits. Four irradiance correction terms for the first of the two

corresponding MAT logical records. When added to the appropriate

uncorrected MAT channel 14 irradiances removes the shortwave heating

response of the channel. (Wm~2 with a scale factor of 10). (Not used,

always equal to zero in versions 1.0 and 2.0).

22. Channel 14 Replacement Irradiances (64 Bits): 4 irradiances * 16 Bits =

64 Bits. Four irradiances which have been corrected for the effects

described above for the first of the two corresponding MAT logical

records. These are replacement irradiances for the channel 14

irradiances existing on the MAT. (Wm~2 with a scale factor of 10).

23. Solar Zenith angle (16 Bits): The solar zenith angle in degrees at the

subsatellite point (0 to 180 degrees with a scale factor of 100) for the

first of the two corresponding MAT logical records.

36
24. Subsatellite Latitude (16 Bits); The latitude in degrees at the

subsatellite point (-81 to 81 degrees with a scale factor of 100) for the

first of four MAT observations in the first of the two corresponding

MAT logical records25. Subsatellite Longitude (16 Bits); The longitude in degrees at the

subsatellite point (-180 to 180 degrees with a scale factor of 100) for

the first of four MAT observations in the first of the two corresponding

MAT logical records.

26. As in items 1-25, but for the second of the two corresponding MAT

logical records.

37
APPENDIX A: TAPE LENGTH ESTIMATE (version 1.0 and 2.0)*

File one will consist of a MOPS standard header record, written twice, and is

called the Standard Header File. The two identical records each contain 630

bytes and are followed by a single end-of-file mark:

0.394 inches = 630 BytesA600BPl (header record)

0.600 inches = (inter-record gap)

0.394 inches = 630 Bytes/1600BPI (header record)

0.600 inches = (inter-record gap)

0.001 inches = 2 BytesA600BPl (end-of-file-mark)

0.600 inches = (inter-record gap)

2.589 inches

A set of files will then follow, each one corresponding to a single day of data.

Each file will contain on the order of 30 physical records, each 24084 Bytes

in length and corresponding to approximately i orbit of data. For N datadays and assuming that each day contains 15 complete orbits of data (an

overestimate):

NM51.575 inches = 30*24084 - Bytes/1600BPI (data records)

N*18.000 inches = (inter-record gap)

N*0.001 inches = 2 Bytes/1600BPI (end-of-file-mark)

N*0.600 inches = (inter-record gap)

470.176N inches

The last file will consist of all NOPS standard header records that relate to

products that have gone into the making of this product and is called the

Trailing Documentation File:

*For version 3.0, use 31500 bytes per physical record instead of 24084.

38
0.394 inches = 630 Bytes/1600 BPI (header record)

0.600 inches = (inter-record gap)

0.394 inches = 630 Bytes/1600 BPI (TDF identifier)

0.600 inches = (inter-record gap)

N*0.394 inches = 630 Bytes/1600BPI (TDF records)

N*0.600 inches = (inter-record gap)

0.001 inches = 2 BytesASOOBPI (end-of-file mark)

0.600 inches = (inter-record gap)

0.001 inches = 2 BytesA600BPI (end-of-volume mark)

0.600 inches = (inter-record gap)

.994N + 3.190 inches

The total tape length estimate is simply the sum of the tape length estimates

of the header file, the N data files and the trailing documentation file:

Total tape length = 471.170N + 5.779 inches

Rounding up to the nearest foot, this is 40 feet per data-day. For a 31 dataday month, this is 1240 feet or 5296 to 56% of a typical tape. Because the

ERB is generally operated in a 3-day on, 1-day off duty cycle, each datamonth will contain 23 to 24 days of data and will occupy 38% to 44% of a

2200 to 2400 foot magnetic 1600 BPI tape. Up to five additional data-days

from the calender month immediately following are included in the datamonth to allow the completion of the last data-cycle (6 calender days)

started in the calender month.

39
APPENDIX B: PROCEDURE STATUS WORD

A status word is created internally during the operation of the calibration

adjustment software. It combines information from the MAT instrument status

word, MAT data quality loss interval (DQLI) flags, interval irradiance quality

control and gap fillings procedures.

The units digit gives quality information on the unconnected MAT WFOV

irradiances and has 3 values:

0 - All WFOV data for channels 12-14 is good.

1 - All WFOV data for channels 13-14 is good.

All WFOV data for channel 12 is bad.

2 - All WFOV data for channels 12-14 is bad.

The tens digit gives the cause of the problem:

0 - All WFOV data is good.

1 - DQLI Flags set.

2 - Go/No go heater is on.

3 - Electronic calibration is on.

4 - Channel 12 is shuttered.

5 - Channel 12 is narrow.

6 - WFOV data values are out-of-limits.

7 - WFOV data ranges are out-oMimits.

8 - Go/No go heater cool-down delay.

9 - Dummy data (should never exist external to the calibration

adjustment software).

The hundreds digit describes how the corrected WFOV channel 12 irradiances

were computed:
0 - All WFOV channel 12 data is unchanged.

1 - All WFOV channel 12 data was replaced by interpolation

2 - All WFOV channel 12 data was replaced with daily normalized

zonal averages.

9 - All WFOV channel 12 data is bad.

The thousands digit describes how the corrected WFOV channel 13 and 14

irradiances were computed:

0 - All WFOV channel 13 and 14 data is unchanged.

1 - AH WFOV channel 13 and 14 data was replaced by interpolation.

2 - All WFOV channel 13 and 14 data was replaced with daily

normalized zonal averages.

9 - All WFOV channel 13 and 14 data is bad (should never exist

external to the calibration adjustment software)

41
ORIGINAL PAGE IS

OF POOR QUALITY

BIBLIOGRAPHIC DATA SHEET

1 . Report No. 2. Government Accession No.

CR 175299

4. Title and Subtitle

User's Guide and Tape Specification

for ERB 7 DELMAT

7. Author(s) Philip Ardanuy

Lanning Penn

9. Performing Organization Name and

Research and Data Sys

10300 Greenbelc Road

Lanham, MD 20706

Address

terns, Corp.

12. Sponsoring Agency Name and Address

Goddard Space Flight Center

Greenbelt, MD 20771

3. Recipient's Catalog No.

5. Report Date

March 1985

6. Performing Organization Code

636

8. Performing Organization Report No.

Contractor 175299

10. Work Unit No.

11. Contract or Grant No.

NAS 5-27728

13. Type of Report and Period Covered

14. Sponsoring Agency Code

NASA GSFC

15. Supplementary Notes

16. Abstract

This document provides guidance to the DELMAT user in the areas of

purpose, use and limitations of DELMAT tapes and software. It also

provides the DELMAT tape specifications. The ERB-7 I-RB MAT and

tape characteristics applicable to the DELMAT tapes are also summarized.

17. Key Words (Selected by Author(s)) 18. Distribution Statement

Nimbus 7 User's Guide Tape

.Specifications, Software Unclassified - Unlimited

19. Security Classif. (of this report)

Unclassified

20. Security Classif. (of this page) 21. No. of Pages 22. Price*

Unclassified 41

'For sale by the National Technical Information Service. Springfield, Virginia «oi /r-i GSFC 25-** (10/77)