urn:nasa:pds:mgs-rss:data-maps:ggm2be60 1.0 1.22.0.0 Product_Observational 2025 MGS RSS This file contains a digital map of Mars gravity anomaly errors. Gravity anomalies were evaluated with respect to the GGM2B model to 60x60 (the approximate degree at which the modified Kaula Rule for Mars intersects the degree covariances of the coefficient standard deviations). The anomaly errors are the uncertainties in the anomaly values derived using the covariances in the model. The data cover 1997-10-13T00:00:00Z to 2000-02-29T12:05:00Z. David Smith 1 Goddard Space Flight Center https://ror.org/0171mag52 2025-02-18 1.0 This product, GGM2BE60.IMG, was originally released as part of the PDS3 MGS-M-RSS-5-SDP-V1.0 data set. The metadata have been migrated to PDS4. The keywords WESTERNMOST_LONGITUDE,EASTERNMOST_LONGITUDE, MINIMUM_LATITUDE, and MAXIMUM_LATITUDE. As used in radio science products, these are the extreme values at pixel centers rather than the extremes of the area represented. For example, if the image has 180 rows at equally spaced latitudes (-89.5, -88.5, ..., -0.5, +0.5, ..., +89.5) then MINIMUM_LATITUDE = -89.5 and MAXIMUM_LATITUDE = 89.5 A more conventional usage might have these same keywords set to -90.0 and +90.0, respectively, because those are the limits of the area represented by the pixels. In cases where the radio science image has 181 rows (-90.0, -89.0, ...,-1.0, 0.0, +1.0, ..., +90.0), the radio science label would show MINIMUM_LATITUDE = -90.0 and MAXIMUM_LATITUDE = 90.0 The more conventional label, in this case, would have the same values. 1997-10-13T00:00:00Z 2000-02-29T12:05:00Z Science Derived Mars Global Surveyor Gravity Anomaly Maps Data Mars Global Surveyor Mission urn:nasa:pds:context:investigation:mission.mars_global_surveyor data_to_investigation Mars Global Surveyor Host urn:nasa:pds:context:instrument_host:spacecraft.mgs is_instrument_host Radio Science Subsystem (RSS) Instrument urn:nasa:pds:context:instrument:mgs.rss is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target Array_3D_Image cartography_parameters_to_image_object -180.0 179.0 90.0 -90.0 Equirectangular 0 0 0 Coordinate Pair 59110.0455857414781 58947.2130066028694 1.00278551532033422 1.00555555555555554 -10669445.5541951191 5334722.77709755953 Planetocentric GGM2B 3396190 3396190 3396190 Positive East Array_3D_Image display_settings_to_array Sample Left to Right Line Top to Bottom urn:nasa:pds:mgs-rss:browse:ggm2bmea::1.0 data_to_browse urn:nasa:pds:mgs-rss:browse:ggm2bmwa::1.0 data_to_browse urn:nasa:pds:mgs-rss:browse:ggm2bpna::1.0 data_to_browse urn:nasa:pds:mgs-rss:browse:ggm2bpsa::1.0 data_to_browse urn:nasa:pds:mgs-rss:data-sha:ggm2bc80::1.0 data_to_derived_product MGS-M-RSS-5-SDP-V1.0:gmm2b.60x60.anomalyerror_grid:GGM2BE60.IMG data_to_derived_source_product 10.17189/1519757 PDS Planetary Plasma Interactions Node This is the first version converted to PDS4. The DOI references the source PDS3 data set. GGM2BE60.IMG 2001-03-21T09:45:30 130320 911e09507df9dc823a678e2577e8805b Array_3D_Image 0 3 Last Index Fastest The model was constructed from 955,115 observations, summarized in the table below. MGS data are limited to tracking from the Aerobraking Hiatus and Science Phasing Orbit (SPO) subphases of the Orbit Insertion phase of the mission and from February 1999 to February 2000 after the orbit was circularized. Time Periods Total Arcs Observations ----------------------- ---- ------------ Hiatus 2 24119 SPO-1 8 31001 SPO-2 16 157972 Feb-Mar 1999 9 76813 Apr 1999 - Feb 2000 47 665210 ----------------------- ---- ------------ Total 955115 SignedMSB2 mm/s/s Band 1 1 Line 181 2 Sample 360 3 -32768 The Digital Map contains uncertainties associated with gravity anomalies where the uncertainties were evaluated using covariances in the model. Units of uncertainties are milligals (1 milligal = 0.01 mm/s/s). The true values can be obtained by multiplying the sample in the map by SCALING_FACTOR and then adding OFFSET.