# Presentation: 510667

## ICESat Science Investigator-Led Processing System

- MOWG II
- David Hancock
- Sept 15-16, 1999
- At GSFC

## ICESAT/GLAS SCIENCE SOFTWARE DEVELOPMENT

**Dr. Bob Schutz, GLAS Science Team Leader****Dr. Jay Zwally, ICESat Project Scientist, GLAS Team Member****Mr. David Hancock, Science Software Development Manager****Ms. Anita Brenner, Deputy Science Software Development Manager**

**ICESAT/GLAS ****SCIENCE SOFTWARE DEVELOPMENT**

##  Science Team/SCF Facilities 

**University of Texas - Dr. Bob Schutz, Science Team Leader **
**Goddard Space Flight Center /Ice Sheet - Dr. Jay Zwally, GLAS Project Scientist**
**Goddard Space Flight Center/Land - Dr. Jack Bufton**
**Goddard Space Flight Center/Atmosphere - Dr. James Spinhirne**
**Ohio State University - Dr. Robert Thomas**
**University of Wisconsin - Dr. Charles Bentley**
**Massachusetts Institute of Technology - Professor Thomas Herring**
**University of California San Diego - Professor Jean-Bernard Minster**

## I-SIPS BASIC DESCRIPTION

_**Performs**_**:**
**The I-SIPS processing performs the following functions:**
**ingest input data**
**execute algorithms to create the GLAS level 1 and 2 data products**
**assess data product for quality and content, and produce metadata**
**create browse products**
**create processing reports/log**
**deliver data products to the NSIDC DAAC**
**Perform reprocessing as required**
**Create quick-look data for science team**
**Receive Level 3 and 4 GLAS special data products produced by the science team**

## I-SIPS PROCESSING BASIC REQUIREMENTS

**Process 24 hours of GLAS instrument data into standard data products within 4 hours of receipt of all required inputs**
**Ability***** *****to***** *****distribute to the Science Team Level 1 and Level 2 data products within 24 hours of receipt of Level 0 data (uses predict ancillary data)**
**Distribute fully processed Level 1 and Level 2 data products to NSIDC within 14 days of receipt of Level 0 data (after becoming operational and assuming proper ESDIS funding) **
**Support reprocessing requirements without delaying regular processing assuming proper funding**

## I-SIPS Interfaces

## DOCUMENTShttp://glas.wff.nasa.gov

- I-SIPS  Documents

*Science Software Management Plan**Science Software Data Management Plan**Science Software Requirements Document*

*I-SIPS Software Architectural Design Document**I-SIPS Software Detailed Design Document**GLAS Level 0 Instrument Data Product Specification**GLAS Standard Data Products Specification**I-SIPS Software User's Guide/Operational Procedures Manual**I-SIPS Software Assurance and Test Procedures**I-SIPS Software Science Data User’s Handbook*

- DOCUMENTS**http://glas.wff.nasa.gov**

## Operations

**Autonomous Operation 7 days/week, 24 hours**
**Normal Manned Operation is 5 days/week, 12 hours**
**Available on-call.**
**Initial calibration period TBD (as many as required)**

## Software Maintenance

**Science Team**
**Will make Science Algorithm written change Request**
**Modifications made to ATBDs as required**
**Will develop and test new Standard Science Processing Software**
**Will deliver the Standard Science Processing Software to I-SIPS**
**I-SIPS**
**Will receive, install, and test new software**
**Will maintain history of software used in data product production**
**Will deliver new s/w package to NSIDC for archive**

## Data Ingest

**EDOS - Level 0 (PDS,EDS)**
**Central SAFS- S-band**
**NSIDC- Met Data**
**NSIDC - Level 0 by request**
**UTGLAS - POD/PAD (Orbit and attitude)**
**ICESat SCF - QA, Special Products**
**ISF- Command File**
**WFF- QA**

## Data Destination

**NSIDC -Standard and Special data Products**
**UTGLAS - GPS/SRS**
**ICESat SCF -Standard Data Products,QA**
**ISF- Level 0 and 1 products**
**WFF-QA**

## I-SIPS Input Data

## I-SIPS Output Data

- (1st Year)

## EDOS Interface requirements

**Provided inputs to I-SIPS**
**PDS - Nominal three hours after available pass, Req 24 hours**
**EDS - Three hours after pass**
**S-band - Half hour after pass via Central SAFS**
**Quick-Look PDS -Three hour after pass**

## ISF Interface Requirements

**I-SIPS provided to ISF**
**On request provide immediate access to PDS,EDS, and S-Band after receiving**
**Provide summary data for trend analyses**
**ISF provided to I-SIPS**
**Event History log**
**S-band data from MOC as required**

## UTGLAS Interface

**Per PDS period I-SIPS provides GPS,SRS, and selected S/C data within two hours of receiving**
**UTGLAS provides POD/PAD daily**
**UTGLAS provides Predict orbit daily**

## NSIDC Interface

**Standard Products - I-SIPS provides14 days after receiving POD/PAD**
**Level 0 - NSIDC provides on request**
**Special Products - I-SIPS provided 4 days after receipt**
**Reprocessed Data- I-SIPS provides after QA**

## ICESat SCF Functions

- Receive standard data products from I-SIPS
- Distribute selected standard data products or subsets of the same to Science Team (ST)
- Provide ST with selective visualization and data selection capability
- Provide science analysis tools
- Provide product QA

## Status

- I-SIPS S/W version 0 delivered 8/99
- I-SIPS and SCF H/W selected
- I-SIPS S/W version 1 in progress
-  SCF S/W Development in Progress

## Schedule

- I-SIPS S/W CDR - Nov 1999
- I-SIPS Version 1 S/W - July 2000
- I-SIPS Facility Space available - July 2000
- I-SIPS H/W Installation - August 2000
- I-SIPS ready to support S/C Testing - Dec 2000
- I-SIPS and SCF ready for launch - Mar 2001

## I-SIPS Typical Day Main Events

**Ingest 4 sets of PDS and S-Band**
**Produce Level 1A Products for current data**
**Ingest POD/PAD for day N**
**Produce Level 1B & 2 products for day N**
**Distribute created products to SCF**
**Create HDF products**
**Distribute QA’d products to NSIDC**
**Reprocess data based on updates(POD/PAD or Algorithm**

## Discussion Issues

**S-Band Data- Size, Content, Processing ( later format)**
**HDF-EOS overhead on file sizes**
**HDF-EOS toolkit availability for current OS**
**SSR Dumps - During MOWG Uniform PDS time periods 0 to 6, etc was decided to be created from the non-uniform pass dumps.**
**GPS reformatting- MOWG action is to investigate I-SIPS creating the archive GPS product in standard format. ( MOC will receive rate buffered GPS quickly)**
**MOC S-band database- MOWG description was**
**raw data for about 2 weeks on-line**
**Summary data for trend stays on-line**
**Output format? (Files can be made)**