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PDS Geosciences Node, Washington University in St. Louis
Geosciences Node Data
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2001 Mars Odyssey: GRS SGS

The gamma sensor part of the GRS instrument suite stopped returning data on September 7, 2009. There are no gamma EDR, CGS, or SGS products since that event. See the ERRATA.TXT file for details.

GRS Summed Gamma Spectra (SGS) products are organized as a single virtual volume. Each data file represents one 5-degree latitude band and has 72 records, each record containing gamma spectra summed over a 5-degree bin of longitude within the band of latitude. Thirty-six data files that represent the 36 5-degree latitude bands on the planet are grouped together in one subdirectory. The data in one subdirectory were acquired during a time interval of 15 degrees of solar longitude (Ls). The subdirectories are in turn grouped into directories by mission year.

Use the links below for direct HTTP access to any part of the GRS SGS archive. Alternatively, to search the archive for data that meet particular criteria, e.g. time and location, use the Mars Orbital Data Explorer (ODE).

AAREADME.TXT Introduction to the archive
ERRATA.TXT Notes and errata for this release
YR04 directory Data products acquired during Odyssey mapping year 4
(Ls 0 - 285, 12/10/07 - 6/15/09)
YR03 directory Data products acquired during Odyssey mapping year 3
(Ls 0 - 360, 1/22/06 - 12/10/07)
YR02 directory Data products acquired during Odyssey mapping year 2
(Ls 0 - 360, 3/6/04 - 1/22/06)
YR01 directory Data products acquired during Odyssey mapping year 1
(Ls 0 - 360, 4/19/02 - 3/6/04)
INDEX directory Index of all products in the archive
DOCUMENT directory Documentation for the archive
CATALOG directory Information about the archive in the PDS Catalog
LABEL directory Format files referenced by the PDS labels. These format files describe the column layout of the data files.
SOFTWARE directory Java source code library for parsing GRS data files
Root directory Top-level directory of the virtual volume

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Curator: Jennifer Ward
NASA Official: Paul Byrne
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