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PDS Geosciences Node, Washington University in St. Louis
Geosciences Node Data
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Mars Exploration Rover Oxide Abundance Data

September 22, 2021.  Release of APXS Oxide Abundance data through the end of mission, updating the previous delivery from 2016.

This data set contains oxide abundance data derived from the APXS Reduced Data Record (RDR) products acquired by the Alpha Particle X-ray Spectrometers on both MER rovers. The data were provided by Ralf Gellert, University of Guelph, and Rudolph Rieder, Max Planck Institute, and archived by the PDS Geosciences Node.

Download the Archive is a zip-compressed 411 KB file containing the complete archive.

Direct Access to Archive Contents Online

Root Directory - Start here for access to the entire volume. 

AAREADME.TXT - Introduction to the archive. Read this first.
ERRATA.TXT - Release notes and errata concerning the archive.
VOLDESC.CAT - Description of the volume contents as a PDS catalog object.

DATA Directory - This archive consists of two tables, one for each rover. Each table is accompanied by a PDS label that defines the table columns. The tables are in comma-separated-value (CSV) format, viewable in any text editor and suitable for loading into a spreadsheet program such as Microsoft Excel.

CATALOG Directory - Files in the CATALOG directory are text files containing documentation formatted for reading by humans and by software. The files contain information about the data set, the instrumentation, references, and
personnel involved in archiving the data. See the file CATINFO.TXT for details. These files are called catalog files because they are entered into the PDS Catalog for online searching.

DOCUMENT Directory - The DOCUMENT directory has notes from the APXS Payload Element Lead. These notes contain important caveats regarding the use of the data. Read these notes carefully to avoid misinterpretation of the data. 

INDEX Directory - The INDEX directory contains a PDS index table for this archive. See the file INDXINFO.TXT for additional details.

  • INDEX.TAB - A list of the products in this archive, their path and file names relative to the root directory, and the product creation time. This file is described by the label INDEX.LBL.

EXTRAS  Directory - The EXTRAS directory in a PDS archive contains ancillary material that may be useful but is not required for the understanding of the archive. In this archive, the EXTRAS directory contains the original Excel spreadsheets as submitted to PDS, which became the basis for the tables in the DATA directory described above. The contents of this directory are described in EXTRINFO.TXT.


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NASA Official: Paul Byrne
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