PDS Geosciences Node Data and Services: 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.

Oct. 1, 2026. The SGS dataset has been converted to PDS4.

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 each 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 PDS3 products in the archive
DOCUMENT directory	Documentation for the archive
CATALOG directory	Information about the archive in the PDS3 Catalog
LABEL directory	Format files referenced by the PDS3 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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