urn:nasa:pds:mgs_mola_topography_derived:data_meg016:megt90n000eb 1.0 1.23.0.0 Product_Observational 2026 This data product is a topographic map of Mars at a resolution of 0.0625 (1/16) by 0.0625 degrees, based on altimetry data acquired by the Mars Global Surveyor MOLA instrument 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 megt90n000eb.img 2003-04-03T01:00:00 This data product is a topographic map of Mars at a resolution of 0.0625 (1/16) by 0.0625 degrees, based on altimetry data acquired by the Mars Global Surveyor MOLA instrument and accumulated over the course of the primary and extended mission. The MOLA Precision Experiment Data Records (PEDRs) are the source for this data set. The map is in the form of a binary table with one row for each 0.0625-degree latitude. Map coordinates use the IAU2000 reference system, and areoid defined by the Goddard Mars potential model GMM3 (mgm1025) evaluated to degree and order 50. The binned data include all MOLA nadir observations from the Mapping Phase through the Primary and Extended missions, from the end of aerobraking in February 1999 through June 2001. Additionally, off-nadir observations of the north pole are included from 87 N latitude and northward, taken during the spring of 1998, and of both poles taken during Mapping from 87 N and S to the poles. Data are adjusted using a first-order crossover solution for radial, along-track, and across-track position. Parts of orbits are excluded where solutions for these orbits are deemed to be poor. (Note: subtract 10000 from a MOLA mapping phase orbit number to determine the equivalent MGS Project orbit number.) Also excluded are shots more than 1.2 degree off-nadir (except as noted above), channel 4 returns, and any returns not classified as ground returns, e.g. clouds or noise, according to the SHOT_CLASSIFICATION_CODE. A total of nearly 600,000,000 observations are represented. gridded_image 0 2 Last Index Fastest Each sample represents median observed topography within a 0.0625 by 0.0625 degree area. Where no observations lie within the area, an interpolated value is supplied. Owing to the polar MGS orbit, density is lowest near the equator, where about 55% of bins contain at least one MOLA shot. There are gaps, however, of up to 12 km between profiles. The minimum and maximum topography observations for the entire data set are -8177 and 21171 meters. Topography is the planetary radius minus the areoid radius at a given longitude and latitude. SignedMSB2 meter Line 2880 1 Sample 5760 2 megt90n000eb.lbl 0 PDS3 Original PDS3 label. Carriage-Return Line-Feed megt90n000eb.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