urn:nasa:pds:mgs-rss:data-maps:ggm1025b 1.0 1.22.0.0 Product_Observational 2025 MGS RSS This file contains a digital map of Mars gravity anomalies evaluated for the MGM1025 model to 66x66 from the Mars Global Surveyor. These data cover 1997-10-13T00:00:00Z to 2000-07-21T23:59:59Z. David Smith 1 Goddard Space Flight Center https://ror.org/0171mag52 2025-02-18 1.0 This product, GGM1025B.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 2000-07-21T23:59:59Z 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 89.5 -89.5 Equirectangular 0 0 0 Coordinate Pair 59110.0455857414781 59274.6975233062185 1.00278551532033422 1 -10669445.5541951191 5334722.77709755953 Planetocentric MGM1025 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:ggm1025a::1.0 data_to_browse urn:nasa:pds:mgs-rss:data-sha:ggm1025a::1.0 data_to_derived_product MGS-M-RSS-5-SDP-V1.0:anom.mgm1025.xyz.todeg66:GGM1025B.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. GGM1025B.IMG 2002-03-20T06:49:18 129600 678c59825276430e95bae058632630bb Array_3D_Image 0 3 Last Index Fastest The model was constructed from 1,625,276 observations, summarized in the table below. Data acquired from February 1999 onward (GCO and Mapping) were using the nominal (circularized) Mapping orbit. Time Periods Total Arcs Observations ----------------------- ---- ------------ Hiatus 2 24119 SPO-1 8 31014 SPO-2 14 136667 GCO 9 80795 Mapping 122 1352661 ----------------------- ---- ------------ Total 1625276 SignedMSB2 mm/s/s Band 1 1 Line 180 2 Sample 360 3 -32768 The Digital Map contains values of vertical gravity in 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.