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NASA Space Science Data Coordinated Archive Header

LRO DLRE LEVEL 2 EDR V1.0 (PDS)

NSSDCA ID: PSPG-01081

Availability: Data Identified but not Received

Time span: 2009-07-05 to 2020-06-15

Description

This description was generated automatically using input from the Planetary Data System.

Data Product Overview

Every 2.048 seconds Diviner collects a data 'frame' containing the following: * 16 sets of science data, with each set containing 192 sixteen-bit science measurements from the focal plane interface electronics obtained over integration periods of 0.128 seconds * A single set of instrument engineering and housekeeping measurements (or 'engineering data') The data are downlinked to the LRO Ground Data System (GDS) and are pushed to the Diviner SOC at the end of each downlink pass. Diviner software assembles the telemetry files into EDR data tables, each covering a one-hour time period. Each Diviner EDR data product will consist of two files. The first file is an ASCII formatted detached PDS label. The second file is the ASCII data table file. Each ASCII record contains 2656 bytes, and there will be a record every 0.128 seconds (unless there is a data gap; time periods which contain no data will not produce data records). Each one-hour Diviner EDR ASCII data table will be up to approximately 75 MB. The volume of the EDR data product will be up to approximately 1800 MB per day. While there is only a single set of engineering data for the 16 sets of science data, it is known during which of the 16 science data sets a given engineering measurement was taken. In the EDR, the engineering data are propagated across each science data set for a completely uniform and flat file. Each engineering measurement will contain a valid value during the appropriate science data set, and the UNKNOWN_CONSTANT (-9999) during the other science data sets where engineering data were not obtained. In the ASCII data tables, each complete set of science data plus engineering data is considered a 'record', and is contained on a single line. Where a data measurement is not valid or applicable, the UNKNOWN_CONSTANT will be found.

Data Processing Level

This document uses the Committee on Data Management and Computation (CODMAC) data level numbering system to describe the processing level of the EDR data product. Diviner EDR data products are considered CODMAC 'Level 2', equivalent to NASA level 0. The EDR data files are generated from CODMAC Level 1 or 'Raw Data', which are the telemetry packets within the project specific Standard Formatted Data Unit (SFDU) record.

Data Product Generation

The Diviner EDR data products will be generated by the Diviner Instrument Team at JPL. The EDR data products will be reconstructed from telemetry data products and formatted according to the EDR SIS. Meta-data acquired from the telemetry data headers will be used to populate the PDS label. The PDS archives will be assembled and delivered to the PDS from UCLA.

Data Flow

Diviner science and engineering telemetry are transferred to the Diviner JPL SOC. Once transferred, the Diviner software automatically processes the telemetry into Level 0 EDR data products. The Diviner EDR data products are then archived locally at the Diviner operation center. After an initial data validation period, the Diviner team will assemble the data products and ancillary files into archive volumes and will transfer the assembled volume to the PDS Geosciences Node. The Diviner EDR archive will be made available via data releases scheduled at three month intervals as specified in the Lunar Reconnaissance Orbiter Project Data Management and Archive Plan. For more information please see the document DP_SIS.HTM (HTML format) or DP_SIS.PDF (Adobe Acrobat format) located in the DOCUMENT directory of this archive.

These data are available on-line from the Planetary Data System (PDS) at:

https://pds-geosciences.wustl.edu/lro/lro-l-dlre-2-edr-v1/lrodlr_0001/

Alternate Names

  • LRO-L-DLRE-2-EDR-V1.0

Discipline

  • Planetary Science: Geology and Geophysics

Additional Information

Spacecraft

Experiments

Questions and comments about this data collection can be directed to: Dr. David R. Williams

 

Personnel

NameRoleOriginal AffiliationE-mail
Prof. David A. PaigeGeneral ContactUniversity of California, Los Angelesdap@thesun.ess.ucla.edu
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