MARS SCIENCE LABORATORY (MSL) PROJECT

SAMPLE ANALYSIS AT MARS (SAM)

 

REDUCED DATA RECORD (RDR)

ARCHIVE VOLUME

SOFTWARE INTERFACE SPECIFICATION

 

 

 

 

 

 

 

Version 1.0

March 20, 2013

Heather Franz, GSFC/UMBC

Susan Slavney, PDS Geosciences Node


TABLE OF CONTENTS

 

1. Introduction................................................................................................................................. 1

1.1. Purpose and Scope............................................................................................................... 1

1.2. Content Overview................................................................................................................ 1

1.3. Applicable Documents and Constraints............................................................................... 3

1.4. Relationships with Other Interfaces.................................................................................... 3

2. Archive Contents......................................................................................................................... 3

2.1. Root Directory Contents...................................................................................................... 4

2.2. Data Directory Contents and Naming................................................................................. 4

2.3. Index Directory Contents.................................................................................................... 4

2.4. Document Directory Contents............................................................................................. 6

2.5. Catalog Directory Contents................................................................................................. 6

2.6. Calib Directory Contents (optional)..................................................................................... 7

3. Archive Format............................................................................................................................ 7

3.1. Document File Formats........................................................................................................ 7

3.2. Table File Formats................................................................................................................ 7

3.3. PDS Label Format............................................................................................................... 8

3.4. Catalog File Format............................................................................................................. 8

3.5. Science Data File Formats................................................................................................... 8

4. Archive Generation.................................................................................................................... 10

4.1. Data Transfer and Validation Methods............................................................................. 10

4.2. Data Product Sizes and Delivery Rates............................................................................. 10

4.3. Interface Media Characteristics......................................................................................... 10

4.4. Backup and Duplicates...................................................................................................... 10

4.5. Labeling and Identification............................................................................................... 10

5. Support Staff and Cognizant Persons....................................................................................... 11

 

TABLES AND FIGURES

 

Table 1‑1. SAM Standard RDR Data Products.............................................................................. 1

Table 1‑2. Processing Levels for Science Data Sets........................................................................ 2

Table 2‑1. Index Table Contents..................................................................................................... 5

Table 4‑1. Standard Product Sizes and Delivery Rates................................................................ 10

 


DOCUMENT CHANGE LOG

 

Change

Date

Affected Portions

Initial draft by S. Slavney

4/6/12

All

Edits by H. Franz

5/9/12

All

Edits for Release 1 by S. Slavney

3/4/13

All

 


TBD ITEMS

 

Section

Description

 

 

 


ACRONYMS AND ABBREVIATIONS

 

ASCII

American Standard Code for Information Interchange

CD-ROM

Compact Disk - Read-Only Memory

CD-WO

Write-Once Compact Disk

EDR

Experiment Data Record

GC

Gas Chromatograph

HTML

HyperText Markup Language

ISO

International Standards Organization

JPL

Jet Propulsion Laboratory

MSL

Mars Science Laboratory

NSSDC

National Space Science Data Center

OPGS

Operations Product Generation Subsystem

PDF

Portable Document Format

PDS

Planetary Data System

PSG

Project Science Group

QMS

Quadropole Mass Spectrometer

RDR

Reduced Data Record

SAM

Sample Analysis at Mars

SIS

Software Interface Specification

TBD

To Be Determined

TIFF

Tagged Image File Format

TLS

Tunable Laser Spectrometer


GLOSSARY

 

Archive – An archive consists of one or more data sets along with all the documentation and ancillary information needed to understand and use the data. An archive is a logical construct independent of the medium on which it is stored.

Archive Volume, Archive Volume Set – A volume is a unit of media on which data products are stored; for example, one CD-ROM or DVD-ROM. An archive volume is a volume containing all or part of an archive; that is, data products plus documentation and ancillary files. When an archive spans multiple volumes, they are called an archive volume set. Usually the documentation and some ancillary files are repeated on each volume of the set, so that a single volume can be used alone. 

Catalog Information – Descriptive information about a data set (e.g. mission description, spacecraft description, instrument description), expressed in Object Description Language (ODL) which is suitable for loading into a PDS catalog.

Data Product – A labeled grouping of data resulting from a scientific observation, usually stored in one file. A product label identifies, describes, and defines the structure of the data. An example of a data product is a planetary image, a spectrum table, or a time series table.

Data Set – An accumulation of data products. A data set together with supporting documentation and ancillary files is an archive.

Standard Data Product – A data product generated in a predefined way using well-understood procedures, processed in "pipeline" fashion. Data products that are generated in a non­standard way are sometimes called special data products.

 


1. Introduction

1.1. Purpose and Scope

This Software Interface Specification is intended to be used by those who wish to understand the format and content of the Mars Science Laboratory (MSL) Sample Analysis at Mars (SAM) Reduced Data Record (RDR) Archive. Typically, these individuals would be software engineers, data analysts, or planetary scientists. 

The specifications in this document apply to all SAM RDR standard product archives that are generated by the SAM Science Team.

1.2. Content Overview

This Software Interface Specification (SIS) describes the format, content, and generation of the SAM RDR Archive. Section 2, Archive Contents, describes the structure of the archive and the contents of each file. Section 3, Archive Format, describes the file formats used in the archive. Section 4, Archive Generation, describes the procedure for assembling the archive and delivering it to the Planetary Data System (PDS). Finally, Section 5, Support Staff and Cognizant Persons, lists the individuals responsible for generating the archive.

The SAM RDR archive includes data sets at various levels of processing, from NASA Level 0 products, which are essentially raw data, through NASA Level 2 products, which are results of data interpretation. Four data sets in all are included in the SAM RDR archive, as shown in Table 1‑1. The standard processing levels for science data sets are described in Table 1‑2 with their commonly used NASA Level and CODMAC Level identifiers. (CODMAC is the Committee on Data Management and Computation; see Applicable Document 6 below.)

 

Table 1‑1. SAM Standard RDR Data Products

Product Name

NASA Level

Description

PDS Data Set ID

SAM L0

0

Unpacking of telemetry into data numbers as raw ADC values or counts and verification of data integrity

MSL-M-SAM-2-RDR-L0-V1.0

SAM L1A

1A

Conversion of raw ADC values or counts to science units

MSL-M-SAM-3-RDR-L1A-V1.0

SAM L1B

1B

Application of corrections to data, e.g., detector dead time, TCD temperature, noise removal, corrections for saturation and instrument response function. Instrument-specific data may include the following types of information:

QMS: time, m/z, signal; oven temperature for EGA runs; GC column temperature for GCMS runs

GC: TCD signal vs. retention time; pressure; temperature; column used

TLS: direct and harmonic spectra

MSL-M-SAM-4-RDR-L1B-V1.0

SAM L2

2

Results of data interpretation completed by the SAM science team. Instrument-specific data may include the following types of information:

QMS: gas composition; isotope ratios; gas composition vs. sample temperature for EGA runs

GC/GCMS: species; relative abundance;  identification of pyrolysis products and derivatized compounds

TLS: abundance and isotope ratios

MSL-M-SAM-5-RDR-L2-V1.0

 

Table 1‑2. Processing Levels for Science Data Sets

NASA

CODMAC

Description

 

 

Packet data

Raw - Level 1

Telemetry data stream as received at the ground station, with science and engineering data embedded.

 

Level-0

Edited - Level 2

Instrument science data (e.g., raw voltages, counts) at full resolution, time ordered, with duplicates and transmission errors removed.

 

Level 1A

Calibrated - Level 3

Level 0 data that have been located in space and may have been transformed (e.g., calibrated, rearranged) in a reversible manner and packaged with needed ancillary and auxiliary data (e.g., radiances with the calibration equations applied).

 

Level 1B

Resampled - Level 4

Irreversibly transformed (e.g., resampled, remapped, calibrated) values of the instrument measurements (e.g., radiances, magnetic field strength).

 

Level 1C

Derived - Level 5

Level 1A or 1B data that have been resampled and mapped onto uniform space-time grids. The data are calibrated (i.e., radiometrically corrected) and may have addi­tional corrections applied (e.g., terrain correction).

 

Level 2

Derived - Level 5

Geophysical parameters, generally derived from Level 1 data, and located in space and time commensurate with instrument location, pointing, and sampling.

 

Level 3

Derived - Level 5

Geophysical parameters mapped onto uniform space-time grids.

 

There is no SAM EDR archive in PDS. The products known as SAM EDRs consist of raw telemetry at the packet level. These are delivered to the SAM Science Team by the MSL Operations Products Generation Subsystem (OPGS). The SAM Team creates the lowest-level RDR product by unpacking the EDR and removing extraneous engineering data. The science content of the EDR is not changed in this process; hence the NASA Level 0 SAM RDR is essentially the raw instrument data.

The SAM Science Team is responsible for creating all the RDR products in this archive, for assembling the archive, and for delivering the archive to the PDS Geosciences Node according to the delivery scheduled determined by PDS and the MSL Project.

1.3. Applicable Documents and Constraints

This Archive Volume SIS is intended to be consistent with the following documents:

1.      Mars Exploration Program Data Management Plan, R. E. Arvidson et al., Rev. 4.0, June 15, 2011.

2.      Mars Science Laboratory Archive Generation, Validation, and Transfer Plan, J. Crisp, MSL-214-1333, JPL D-35281, May 28, 2010.

3.      Mars Science Laboratory (MSL) Software Interface Specification SAM Reduced Data Record (RDR), H. Franz, SIS-SCI020-MSL, JPL D-38123, Version 2.0, February 13, 2013.

4.      Planetary Data System Archive Preparation Guide, April 1, 2010, Version 1.4, JPL D-31224.

5.      Planetary Data System Standards Refer­ence, February 27, 2009, Version 3.8. JPL D-7669, Part 2.

6.      Issues and Recommendations Associated with Distributed Computation and Data Management Systems for the Space Sciences, Committee on Data Management and Computation (CODMAC), National Academy of Sciences, National Academy Press, 111p, 1986.

7.      Mars Science Laboratory Sample Analysis at Mars (SAM) Science Team and PDS Geosciences Node Interface Control Document (ICD), S. Slavney, Version 3.0, April 5, 2011.

1.4. Relationships with Other Interfaces

This Archive Volume SIS could be affected by changes to the design of the SAM RDR standard data products (Applicable Document 3).

2. Archive Contents

This section describes the contents of the SAM RDR Archive, including the directory names, file names, file contents, file types, and organization responsible for providing the files.

2.1. Root Directory Contents

Files in the Root Directory include an overview of the archive, a description of the volume for the PDS Catalog, and a list of errata or comments about the archive. The following files are contained in the Root Directory.

 

File Name

File Contents

File Provided By

AAREADME.TXT

Volume content and format information

Geosciences Node

ERRATA.TXT

A cumulative listing of comments and updates concerning all archive volumes published to date

SAM Team

VOLDESC.CAT

A description of the contents of this volume in a PDS format readable by both humans and computers

Geosciences Node

2.2. Data Directory Contents and Naming

The Data Directory contains one subdirectory for each SAM experiment, using names in the form EIDnnnnn, where nnnnn is a 5-digit SAM experiment identifier. Within each experiment, subdirectories are named LEVEL0, LEVEL1A, LEVEL1B, and LEVEL2 and correspond to the RDR data sets identified in Table 1‑1.

See the SAM RDR SIS, Applicable Document 3, for the naming scheme for individual SAM RDR data files.

2.3. Index Directory Contents

Files in the Index Directory are provided to help the user locate products in the archive. There is one index table for each data set. If it ever becomes necessary for PDS to subdivide the archive into multiple volumes, cumulative index tables will be provided that cover all the volumes. The following files are contained in the Index Directory.

 

File Name

File Contents

File Provided By

INDXINFO.TXT

A description of the contents of this directory

Geosciences Node

L0_INDEX.TAB

A table listing all Level 0 RDR data products on this volume

SAM Team

L0_INDEX.LBL

A PDS detached label that describes L0_INDEX.TAB

SAM Team

L1A_INDEX.TAB

A table listing all Level 1A data products on this volume

SAM Team

L1A_INDEX.LBL

A PDS detached label that describes L1A_INDEX.TAB

SAM Team

L1B_INDEX.TAB

A table listing all Level 1B data products on this volume

SAM Team

L1B_INDEX.LBL

A PDS detached label that describes L1B_INDEX.TAB

SAM Team

L2_INDEX.TAB

A table listing all Level2 data products on this volume

SAM Team

L2_INDEX.LBL

A PDS detached label that describes L2_INDEX.TAB

SAM Team

L0_CUMINDEX.TAB

A table listing all Level 0 data products on all SAM RDR volumes, if the archive contains more than one volume

Geosciences Node

L0_CUMINDEX.LBL

A PDS detached label that describes L0_CUMINDEX.TAB

Geosciences Node

L1A_CUMINDEX.TAB

A table listing all Level 1A data products on all SAM RDR volumes, if the archive contains more than one volume

Geosciences Node

L1A_CUMINDEX.LBL

A PDS detached label that describes L1A_CUMINDEX.TAB

Geosciences Node

L1B_CUMINDEX.TAB

A table listing all Level 1B data products on all SAM RDR volumes, if the archive contains more than one volume

Geosciences Node

L1B_CUMINDEX.LBL

A PDS detached label that describes L1B_CUMINDEX.TAB

Geosciences Node

L2_CUMINDEX.TAB

A table listing all Level 2 data products on all SAM RDR volumes, if the archive contains more than one volume

Geosciences Node

L2_CUMINDEX.LBL

A PDS detached label that describes L2_CUMINDEX.TAB

Geosciences Node

 

An index table contains one row for each product in the data set. Table 2‑1 lists the columns of the index table. If cumulative index tables are present, they have the same structure as the index tables.

Table 2‑1. Index Table Contents

Column Name

Description

Source

VOLUME_ID

PDS archive volume on which a data product is stored

Specified at time of index table creation

PATH_NAME

Directory path to data product, relative to volume root

Determined by location of PDS label file

FILE_NAME

Name of label file for data product

PDS label file name

PRODUCT_ID

Unique identifier for data product

PDS label

PRODUCT_VERSION_ID

Version number of data product

PDS label

PRODUCT_CREATION_TIME

Date and time of data product creation

PDS label

RELEASE_ID

ID of scheduled data release to PDS in which this product was included

PDS label

START_TIME

UTC date and time of start of observation

PDS label

STOP_TIME

UTC date and time of end of observation

PDS label

SPACECRAFT_CLOCK_START_COUNT

Spacecraft clock count at start of observation

PDS label

SPACECRAFT_CLOCK_STOP_COUNT

Spacecraft clock count at end of observation

PDS label

PLANET_DAY_NUMBER

Sol number

PDS label

OBSERVATION_ID

Unique identifier for a science observation in the data set

PDS label

SOLAR_LONGITUDE

Angle between Mars-Sun line at vernal equinox and at time of observation; a measure of season

PDS label

MSL:SAM_EXPERIMENT_ID

A number that uniquely identifies the SAM experiment that produced the data

PDS label

MSL:SAM_GC_COLUMN_NUMBER

The SAM GC column number used in the experiment

PDS label

 

2.4. Document Directory Contents

The Document Directory contains documentation to help the user understand and use the archive data. The following files are contained in the Document Directory.

 

File Name

File Contents

File Provided By

DOCINFO.TXT

A description of the contents of this directory

Geosciences Node

RDRDPSIS.HTM

The Data Product SIS as hypertext

SAM Team or Geosciences Node

RDRDPSIS.PDF

The Data Product SIS as a PDF file

SAM Team

RDRDPSIS.LBL

A PDS detached label that describes both DPSIS.TXT(HTM) and DPSIS.PDF

SAM Team

RDRARCHSIS.HTM

The Archive Volume SIS (this document) as hypertext

SAM Team or Geosciences Node

RDRARCHSIS.PDF

The Archive Volume SIS (this document) as a PDF file

SAM Team

RDRARCHSIS.LBL

A PDS detached label that describes both ARCHSIS.HTM and ARCHSIS.PDF.

SAM Team

MSL_LDD.FUL, .LBL

MSL local data dictionary and PDS label

PDS Engineering Node

PDSDD.FUL, .LBL

PDS data dictionary and label

PDS Engineering Node

RDRDPSIS_FILES

Subdirectory containing image files referenced in RDRDPSIS.HTM

SAM Team

2.5. Catalog Directory Contents

The files in the Catalog Directory provide a top-level understanding of the mission, spacecraft, instruments, and data sets. The files in this directory are coordinated with the PDS data engineer,                         who is responsible for loading them into the PDS catalog. The following files are found in the Catalog Directory.

 

File Name

File Contents

File Provided By

CATINFO.TXT

A description of the contents of this directory

Geosciences Node

SAMRDRL0_DS.CAT

Data set information for the PDS catalog

SAM Team

SAMRDRL1A_DS.CAT

Data set information for the PDS catalog

SAM Team

SAMRDRL1B_DS.CAT

Data set information for the PDS catalog

SAM Team

SAMRDRL2_DS.CAT

Data set information for the PDS catalog

SAM Team

MSL_INSTHOST.CAT

Instrument host (i.e., spacecraft) information for the PDS catalog

MSL Project

SAM_INST.CAT

Instrument information for the PDS catalog

SAM Team

MSL_MISSION.CAT

Mission information for the PDS catalog

MSL Project

PERSON.CAT

Personnel information for the PDS catalog (Team and PDS personnel responsible for generating the archive)

SAM Team

MSL_REF.CAT

References mentioned in MSL*.CAT files

MSL Project

SAM_REF.CAT

References mentioned in SAM*.CAT files and any other pertinent references

SAM Team

2.6. Calib Directory Contents

The Calib Directory contains calibration files used to process the data products, or calibration data needed to use the data products. The following files are contained in the Calib Directory.

File Name

File Contents

File Provided By

CALINFO.TXT

A description of the contents of this directory

Geosciences Node

SAM_HK_CONVERSIONS.CSV, .LBL

Conversion factors for science and engineering units

SAM Team

 

3. Archive Format

This section describes file formats used in the SAM RDR archive. Data that comprise the archive will be formatted in accordance with Planetary Data System specifications [Applicable Documents 4 and 5].

3.1. Document File Formats

Document files with the .TXT suffix exist in all directories. They are ASCII files which may have embedded PDS labels. Lines in a .TXT file end with a carriage return character (ASCII 13) and a line feed character (ASCII 10). This allows the files to be readable under various operating systems.

Documents in the Document directory may contain formatting and figures that cannot be rendered as ASCII text. Therefore each document is given in two formats, hypertext and PDF. The hypertext file contains ASCII text plus hypertext markup language (HTML) commands that enable it to be viewed in a Web browser such as Netscape Navigator or Microsoft Internet Explorer. The hypertext file may be accompanied by ancillary files such as images and style sheets that are incorporated into the document by the Web browser. The second format is PDF (Portable Document Format) from Adobe Systems Incorporated. PDF is an International Standards Organization (ISO) open standard format (ISO 32000) for which free reader software is widely available.

3.2. Table File Formats

Two kinds of table formats are used in the SAM RDR archive, TAB and CSV. Both are ASCII files. Files with the .TAB suffix have fixed-width columns so that all rows in the table are the same length, and the columns are vertically aligned when viewed in a text editor. Columns are separated by commas. Character values are enclosed in double quotation marks, padded with spaces to keep the closing quotation mark at the end of the column. The label that describes a TAB file gives the start byte and number of bytes for each column, along with the column's name, description, and data type. The last two bytes of each row are the ASCII carriage return and line feed characters.

Files with the CSV suffix are Comma-Separated-Value tables. Instead of columns, a row in a CSV table has fields. The fields are separated by commas, but fields are not necessarily the same width from one row to the next and therefore they may not align vertically. The rows in a CSV file may not be all the same length. If there is no data value for a given field, it may be omitted, indicated by two successive commas with no space between them. This format is useful for saving storage space in sparsely populated tables. As in TAB files, rows in CSV files end in the ASCII carriage return and line feed characters.

3.3. PDS Label Format

Every data file in the archive is described by a detached PDS label; that is, a label in a separate file with the same base name but the extension LBL. Many of the non-data files in the archive are also accompanied by PDS labels, either detached or attached (embedded at the beginning of the file).

A PDS label, whether attached or detached, consists of lines of ASCII text in the form of keyword = value statements that provide descriptive information about the data file. The label is intended to be readable both by humans and by software. Details of the syntax and semantics of PDS labels can be found in the PDS Standards Reference (Applicable Document 5), and definitions of the keywords used in the label can be found by using the PDS Data Dictionary Lookup web service at http://pds.jpl.nasa.gov/tools/ddlookup/data_dictionary_lookup.cfm.  

Lines of text in attached and detached labels end with an ASCII carriage return and line feed pair. This allows the files to be read under various operating systems.

3.4. Catalog File Format

Catalog files (suffix .CAT) exist in the Root and Catalog directories. Like PDS labels, they are text files formatted as keyword = value statements which are both human-readable and software-readable. They contain descriptions of the data set, instrument, spacecraft, and mission, as well as personnel contact information and references to published literature. They are called Catalog Files because they are loaded into the PDS online catalog to make the information available to users searching for data.  

3.5. Science Data File Formats

One SAM RDR product consists of one PDS label and one or more data files. A label that describes more than one data file is called a combined-detached label (Applicable Document 5). In cases where multiple data files comprise a single RDR product, a list of the data files will appear near the beginning of the label using the PDS file pointer syntax, as in this example:

 

/* POINTERS TO ALL DATA FILES DESCRIBED IN THIS LABEL */

^FILE       = "SM24128A0141RDR1B_SPYR_QMS_PARAMSX_1.TAB"

^FILE       = "SM24128A0141RDR1B_SPYR_QMS_MASSDTC_1.TAB"

^FILE       = "SM24128A0141RDR1B_SPYR_QMS_BANDDTC_1.TAB"

The name of the label file in this example would be SM24128A0141RDR1B_SPYR_QMS_XXXXXXX_1.LBL.

Most SAM RDR data products are ASCII text files in the TXT, TAB, and CSV formats described above. These products are viewable in any text editor. TAB and CSV files are also suitable for use in spreadsheet and data base management software.

The SAM Level 2 RDR data set also includes TIFF image files (extension .TIF) as illustrations of the science results reported in the TXT and CSV files. TIFF images may be displayed by many image processing programs, including free image processing software. They are not viewable in web browsers.

For more information about the format and content of the data products, see the Data Product SIS, Applicable Document 3.


4. Archive Generation

4.1. Data Transfer and Validation Methods

 

SAM RDR products are generated by the SAM science team at NASA Goddard Space Flight Center. The products are delivered to the PDS Geosciences Node at Washington University electronically using FTP according to the schedule in the Mars Science Laboratory Archive Generation, Validation, and Transfer Plan (Applicable Document 2).

 

4.2. Data Product Sizes and Delivery Rates

Table 4‑1 summarizes expected sizes and production rates for the SAM RDR Standard Products.

 

Table 4‑1. Standard Product Sizes and Delivery Rates

Product

Product Size

Production Rate

Expected Number of Products for Primary Mission (669 sols)

Expected Total Data Volume for Primary Mission

SAM L0

80 MB

One per experiment

80

6.4 GB

SAM L1A

95 MB

One per experiment

80

7.6 GB

SAM L1B

20 MB

One per experiment

80

1.6 GB

SAM L2

1 MB

One per experiment

80

80 MB

 

4.3. Interface Media Characteristics

All volumes in the SAM RDR Standard Product Archive conform to ISO 9660 standards [ISO 9660, 1988].

4.4. Backup and Duplicates

The SAM Team will retain backup copies of all data delivered to the Geosciences Node until the data have been released to the public.

The Geosciences Node will maintain three backup copies of the SAM RDR archives that are kept online for public use, according to standard PDS policy for backup copies. When the SAM RDR archive is complete at the end of the MSL mission, the Geosciences Node will deliver a copy of the archive to the National Space Science Data Center (NSSDC) for long-term storage, but the Geosciences Node will maintain its own copies of the archive indefinitely.

4.5. Labeling and Identification

All SAM RDR data sets are stored on one PDS archive volume (that is, under one directory structure). Under the top level DATA directory there is a separate subdirectory for each data set, as described in section 2.2. During the course of the mission, as new data products are delivered to PDS they are added to the existing archive volume. The unique identifier for the SAM RDR archive volume is MSLSAM_1XXX. If it ever becomes necessary for PDS to subdivide the archive volume into smaller volumes for data storage or transfer, they will be identified as MSLSAM_1001, MSLSAM_1002, etc.

5. Support Staff and Cognizant Persons

Susan Slavney, PDS Archive Point of Contact for SAM

PDS Geosciences Node

Washington University

St. Louis, Missouri

Susan.Slavney@wustl.edu

 

Paul R. Mahaffy, SAM Principal Investigator

NASA Goddard Space Flight Center, Code 699

Greenbelt, Maryland

paul.r.mahaffy@nasa.gov

 

Heather Franz, SAM Point of Contact for PDS

NASA Goddard Space Flight Center, Code 699

Greenbelt, Maryland

heather.b.franz@nasa.gov

 

Matthew Lefavor, SAM software support

NASA Goddard Space Flight Center, Code 699

Greenbelt, Maryland

matthew.lefavor@nasa.gov