Odyssey Gamma Ray Spectrometer (GRS)

ODE: Mars

Mission: Odyssey

Instrument: GRS

PDS Geosciences Node: PDS Source Information

Search 2001 Mars Odyssey GRS data in Mars ODE: Product Search

The 2001 Mars Odyssey gamma ray spectrometer has measured the abundance and distribution of many elements of the periodic table, including hydrogen, silicon, iron, potassium, thorium, and chlorine. Knowing what elements are at or near the surface gives detailed information about how Mars has changed over time. To determine the elemental makeup of the Martian surface, the experiment uses gamma ray spectrometer and two neutron detectors. Information about GRS products can be found in:

GRS Data Node - This includes a searchable database!

GRS Products

PDS4 Processing Level	Type	Description	PDS3 Data Set	PDS4 Collection
Raw Data	CMDLST	Experiment Data Record - Command execution List Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	EKERNL	Experiment Data Record - Experimenter's Notebook Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	GAMMAS	Experiment Data Record - GRS raw gamma ray spectra Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	GRSENG	Experiment Data Record - CEB, GRS, and NS engineering data Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	HENDS	Experiment Data Record - High Energy Neutron Detector data Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0	urn:nasa:pds:odyssey_grs_edr:data_science_raw
	MESSLG	Experiment Data Record - CEB system message log Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	NEUTNS	Experiment Data Record - Neutron spectrometer data Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0	urn:nasa:pds:odyssey_grs_edr:data_science_raw
	PROFIL	Experiment Data Record - High time resolution count rates Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
	PULSRS	Experiment Data Record - Pulser calibration spectra Please see the GRS EDR Software Interface Specification (SIS), Archive Software Interface Specification (SIS) and other documents for more information.	ODY-M-GRS-2-EDR-V1.0
Calibrated Data	CGS	Correct Gamma Spectra Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Corrected Gamma Spectra (CGS) information and archive at the PDS Geosciences Node	ODY-M-GRS-4-CGS-V1.0
	DHD	Derived High Energy Neutron Detector (HEND) Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Derived HEND Data (DHD) information and archive at the PDS Geosciences Node	ODY-M-GRS-4-DHD-V1.0	urn:nasa:pds:odyssey_grs_dhd
	DND	Derived Neutron Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Derived Neutron Data (DND) information and archive at the PDS Geosciences Node	ODY-M-GRS-5-DND-V2.0	urn:nasa:pds:odyssey_grs_dnd:data_science_derived
Derived Data	AHD	Averaged High Energy Neutron Detector (HEND) Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Average HEND Data (AHD) information and archive at the PDS Geosciences Node	ODY-M-GRS-5-AHD-V1.0	urn:nasa:pds:odyssey_grs_ahd:data_science_averaged
	AND	Averaged Neutron Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Average Neutron Data (AND) information and archive at the PDS Geosciences Node	ODY-M-GRS-5-AND-V2.0	urn:nasa:pds:odyssey_grs_and
	SGS	Summed Gamma Spectra Data Record - Please see the GRS Intermediate Data Record SIS and other documents for more information. Summed Gamma Spectra (SGS) information and archive at the PDS Geosciences Node	ODY-M-GRS-5-SGS-V1.0
	ELEMTS	Element Concentration Map Data Records - Products contain elemental data along with a browse concentration map. Please see the archive readme file for more information. Element Concentration Maps information and archive at the PDS Geosciences Node	ODY-M-GRS-5-ELEMENTS-V1.0

Derived Data Sets from Individual Investigators

Type	Instrument	Description	PDS4 Collection
IDND	GRS	2001 Mars Odyssey GRS Improved DND Products include high-order Category 1 DND time-series data and improved high-order Category 2 DND time-series data from the beginning of the mission to December 2020. See Improved Derived Neutron Data User Guide (PDF).	urn:nasa:pds:mesick_pdart19_odyssey_idnd:data_idnd