urn:nasa:pds:mgs_mola_topography_derived:data_meg016:mega90n000eb 1.0 1.23.0.0 Product_Observational 2026 This data product is the reference datum used to generate the MOLA topographic maps. Producer David E. Smith Goddard Space Flight Center, MOLA Team DataCurator Madison N. Hughes Washington University in St. Louis 2026-08-25 1.0 Initial PDS4 version 1997-09-15T19:10:00.000Z 2001-06-30T11:10:40.000Z Mars Global Surveyor Mission urn:nasa:pds:context:investigation:mission.mars_global_surveyor data_to_investigation MOLA The Mars Global Surveyor Spacecraft Host urn:nasa:pds:context:instrument_host:spacecraft.mgs is_instrument_host Mars Global Surveyor Spacecraft Mars Orbiter Laser Altimeter Instrument urn:nasa:pds:context:instrument:mgs.mola is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target 3 20333 gridded_image cartography_parameters_to_image_object 0 360 90 -90 Equirectangular 0. 180. Coordinate Pair 16 16 3.705 3.705 -10670400 5335200 Planetocentric 3396.0 3396.0 3396.0 Positive East Body-fixed Rotating PLANETOCENTRIC gridded_image display_settings_to_array Sample Left to Right Line Top to Bottom 1999-08-08T03:10:20.000Z 1997-09-15T19:10:00.000Z 2001-06-30T11:10:40.000Z Mars Planetocentric Mars IAU2000_MARS urn:nasa:pds:mgs_mola_topography_derived:document:egdrsis data_to_document urn:nasa:pds:mgs_mola_topography_derived:document:mola_envi data_to_document mega90n000eb.img 2003-04-03T01:00:00 This data product is the reference datum used to generate the MOLA topographic maps. The map is in the form of a binary table with one row for each 0.0625-degree latitude. The datum consists of an equipotential surface described by the potential model GMM3, the Goddard Mars Gravity Model mgm1025 evaluated to degree and order 50. Truncation of this degree and order 80 field to degree 50, for consistency with earlier MOLA releases, introduces about 3 m of truncation error except over large volcanoes, where it may remove up to 50 m of the areoid height. The uncertainty in the areoid through degree 60 is 1.8 m RMS. The mean radius of the equipotential surface at the equator is 3,396,000 meters. The radius at a given latitude and longitude is found iteratively by evaluating the potential model at that location and matching the calculated potential to the mean equatorial potential. gridded_image 0 2 Last Index Fastest Areoid radius at the center of the 0.0625 by 0.0625 degree area, after subtracting 3,396,000 meters. SignedMSB2 meter 3396000 Line 2880 1 Sample 5760 2 mega90n000eb.lbl 0 PDS3 Original PDS3 label. Carriage-Return Line-Feed mega90n000eb.hdr 0 7-Bit ASCII Text The ENVI header is a separate ASCII file that includes basic image data file characteristics. ENVI will read both files and use the map projection information in the header file to correctly display the image. The header files are provided because ENVI is not able to import the map projection information directly from the MEGDR image labels. Carriage-Return Line-Feed