Data Set Information
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| DATA_SET_NAME |
MER 2 MARS ALPHA PARTICLE X-RAY SPECTROMETER 2 EDR OPS V1.0
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| DATA_SET_ID |
MER2-M-APXS-2-EDR-OPS-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Data Set Overview : This data set contains data that is useful for determining the major and minor elemental composition of Martian soils, rocks, and other geological materials that the rover encountered. The EDR data products are raw uncalibrated data reconstructed from telemetry data products and formatted according to the APXS EDR Software Interface Specification. Meta-data acquired from the telemetry data headers are used to populate the PDS label. There will not be multiple versions of an APXS EDR. Processing : The Committee On Data Management and Computation (CODMAC) data level numbering system is used to describe the processing level of the EDR data product. APXS EDR data products are considered CODMAC Level 2 or Edited Data (equivalent to NASA level 0) products. The EDR data files are generated from Level 1 or Raw Data, which are the telemetry packets within the project specific Standard Formatted Data Unit (SFDU) record. The APXS EDR data products were generated by the MIPL (Multimission Image Processing Laboratory) at JPL under the Operations Product Generation Subsystem using the telemetry processing software, mertelemproc. If telemetry packets are missing during the initial downlink from the rover memory, partial data sets will be created and the missing data will be filled with (zeroes). The data will be reprocessed after all data are received and the original version will be overwritten. The APXS memory is maintained by a battery, and in theory, retransmits from the APXS memory could be commanded. In this instance, a new data product will be created, because there will likely be subtle and potentially useful changes in the data when a retransmit from the APXS memory is commanded. Data : Each APXS EDR consists of two files. The first file is an ASCII formatted detached PDS label. The second file is a binary data file. The APXS EDR data file is a copy of what was in the APXS memory buffer. That is, the EDR consists of unprocessed experiment data stored in binary format. The APXS EDR contains energy spectra in units of counts and temperature values. Temperatures are derived from the two temperature sensors. There are two types of APXS spectra in each measurement: one x-ray, and two alpha spectra. The energy scale is divided into discrete channels with 256 channels for the alpha spectra and 512 channels for the x-ray spectra. The instrument holds data for the twelve most recent measurements in memory. When a new measurement begins, the oldest one is discarded. Each spectrum has a unique identifier. There are also 2 Kbytes at the end of the APXS EDR data file that are transferred from the instrument's internal RAM. This 2 Kbyte section of RAM is used for instrument engineering data. Software : A reader program, called apxs2asc will be available to convert the APXS EDR binary format data into ASCII format. This reader will be archived with the EDR data products. The ASCII format data can be imported into spread sheet and plotting programs. PDS labeled tables can be viewed with the program NASAView, developed by the PDS. NASAView is available in versions that run on SUN/SOLARIS, WINDOWS, and LINUX operating systems. NASAView can be obtained from the PDS web site at http://pdsproto.jpl.nasa.gov/Distribution/license.html. Media/Format : The data set will be intitially delivered and kept online. Upon Mission completion, the APXS EDRs will be delivered to PDS on DVD as part of the complete MER EDR data set.
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| DATA_SET_RELEASE_DATE |
2004-08-03T00:00:00.000Z
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| START_TIME |
2004-01-05T05:38:21.429Z
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| STOP_TIME |
N/A (ongoing)
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| MISSION_NAME |
MARS EXPLORATION ROVER
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| MISSION_START_DATE |
2000-05-08T12:00:00.000Z
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| MISSION_STOP_DATE |
N/A (ongoing)
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| TARGET_NAME |
MARS
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| TARGET_TYPE |
PLANET
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| INSTRUMENT_HOST_ID |
MER2
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| INSTRUMENT_NAME |
ALPHA PARTICLE X-RAY SPECTROMETER
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| INSTRUMENT_ID |
APXS
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| INSTRUMENT_TYPE |
SPECTROMETER
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| NODE_NAME |
Geosciences
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| ARCHIVE_STATUS |
ARCHIVED - ACCUMULATING
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| CONFIDENCE_LEVEL_NOTE |
NULL
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| CITATION_DESCRIPTION |
Rieder, Rudolf, and Ralf Gellert,MER 2 Alpha ParticleX-Ray Spectrometer 2 EDR V1.0, NASAPlanetary Data System,MER2-M-APXS-2-EDR-V1.0, 2004.
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| ABSTRACT_TEXT |
This archive contains Mars Exploration Rover Operations (Ops) APXS Experiment Data Record (EDR) products and ancillary files. Each EDR product has a detached PDS label that describes the file structure and instrument parameters used for that image. The APXS Operations EDR products archived on this volume are the original products used during mission operations by the Mars Exploration Rover project.
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| PRODUCER_FULL_NAME |
Rudolf Rieder
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| SEARCH/ACCESS DATA |
MER Data Archives
Geosciences Online Archives
Image Atlas
MER Analyst Notebook
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