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Mars Global Surveyor: MOLA PEDRs Precision Experiment Data RecordsPEDRs are generated from the raw altimetry profile data (AEDRs) with precision orbit corrections applied. They are time-ordered binary tables with attached PDS labels. Tools for Use with PEDR Products
IDL and Fortran software is available to read and extract data from PEDR files. PEDR Data OnlineUse the links below for direct access to any part of the MOLA PEDR archive. Or follow this link for FTP access to this data set. (FTP users, read our FTP instructions first.)
Note on PEDR Processing VersionsThe processing software used to generate MOLA PEDRs was updated as better orbit information became available during the mission. The processing version of a given PEDR is indicated by the last character of the file name (before the period). For example, AP10146L.B is version L. (Versions increase alphabetically.) PEDRs processed with different software versions have only minor differences, but users should be aware that the multiple versions exist. Processing version L is the last version, released May 27, 2003. Version L uses IAU2000 planetocentric coordinates, incorporates crossover analysis of individual profiles, and is referenced to the latest Mars gravity model. All PEDR products on this web site have been reprocessed to version L, to provide a complete set of PEDRs with a consistent processing history. These products are intended to replace previously released PEDRs, found on CD-ROM volumes MGSL_0001 through MGSL_2054. The first two MOLA CD-ROM volumes, MGSL_0001 and MGSL_0002, and the MGS Sampler CD contained versions of PEDRs in ASCII tables as well as binary. This proved to be an impractical storage format, so later volumes did not include the ASCII versions. The data in the ASCII files have been superseded by the present PEDR data set.
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