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SDDPT Viking Water Vapor Project Data - MAWD EDR's and Supplementary EDR's


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)


This data set contains the Viking Water Vapor Project Tapes copied to CD-WO. The project tapes consist of the Viking Orbiter 1 and 2 Mars Atmospheric Water Detector (MAWD) Experiment Data Records (EDR's) and Supplementary Experiment Data Records (SEDR's). These are the data records from which the Reduced Data Records were generated.

A total of 389 7-track magnetic tapes were copied to these CD-WO's by the Science Digital Data Preservation Task (SDDPT). These tapes were in most cases at least 15-20 years old. Accompanying each tape on the disc is a log file which documents SDDPT processing history. Each CD-ROM disc has been formatted so that a variety of computer systems (e.g. IBM PC, Macintosh, Sun, VAX) may access the data. Specifically, the discs are formatted according to the ISO 9660 level 1 Interchange Standard, and file attributes are specified by Extended Attribute Records (XARs).

The 7-track data in this dataset was padded to 8-bits by replacing the first (parity) bit with zero and adding a zero bit in front of that. The 7-track tape data was originally written in "SNAKED" format with attached EBCDIC VICAR labels in front of the data. The file WVP_INFO.TXT is located on each CD in the series. It correlates the tape ID with available descriptions of the tapes' contents. More information is available in the README file on the CD.

This data set was created at JPL as part of its Science Digital Data Preservation Task (SDDPT), and a copy was provided to NSSDC for safekeeping. Numerous SDDPT data sets are not readily usable, as they represent bit copies of old data tapes and do not contain user documentation. Persons interested in ordering these data should contact the NSSDC person listed for this data set.

This is SDDPT data set code 326E, volume IDs VO_1201 - VO_1204.

Alternate Names

  • VO1/2-M-WVD-2-EDR-V1.0(CD-WO)
  • VO1/2-M-WVD-2-EDR-V1.0


  • Planetary Science: Atmospheres


  • 75-075A-03E

Additional Information



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



NameRoleOriginal AffiliationE-mail
Ms. Amy Hochstettler CulverData ProviderNASA Jet Propulsion
Mr. Frank D. PalluconiGeneral ContactNASA Jet Propulsion
Ms. Susan K. LaVoieGeneral ContactNASA Jet Propulsion
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