PDS_VERSION_ID     = PDS3
RECORD_TYPE        = STREAM
OBJECT             = TEXT
  PUBLICATION_DATE = 2016-05-16
  NOTE             = "VPDS_HIGH_XYZDAT_FORMAT document
                      in the Viking Lander 2 seismology experiment archive."
END_OBJECT         = TEXT
END

VPDS HIGH XYZDAT FORMAT

The data file VPDS_HIGH_ZAMP.CSV is the full raw (XYZ)-axis High rate record of
the Viking Seismometer data.

The file was generated by parsing the raw ('VUSA') files, and where the High
mode flag was detected and valid data found with the standard 83-point length,
the Z-axis readings are extracted and placed into a single record (one line) in
this file. The record number in the first column is that in the summary/index
file (HIGH_WIND_SUMMARY.TAB) allowing location of the original raw record, and
relation to the closest meteorological data.

Column 2 is the reconstructed lander time (Local Mean Solar Time) in decimal
Sols, starting from Sol 0 (landing). LMST is calculated from the Sol, hour,
minute and second of the start of the record from the VUSA file (itself
reconstructed from the lander clock), noting that one mean solar day on Mars is
88775.24 seconds. The subsequent 4 columns are the the Sol, hour, minute and
second of the start of the record.

The following 83 columns are the (XYZ)-axis seismometer readings (7 bit signed
integers). The data were acquired at 20.2 samples per second per channel, thus
the record spans just over 4 seconds. The corresponding X- and Y- axis readings
are found in the VPDS_HIGH_XDAT.CSV and VPDS_HIGH_YDAT.CSV files.

Original VUSA files are archived at JAXA.

The data file was generated by R. Lorenz on 12/12/2016 and may be cited by 
'R. D. Lorenz, Y. Nakamura, J. Murphy, Viking Seismometer Data Restoration 
and Meteorological Application, VL2-M-SEIS-5-RDR-V1.0, Planetary Data System, 
2016'. This work was supported by the NASA Mars Data Analysis Program (MDAP) 
Grant, Viking Lander Meteorology and Seismology, NNX12AJ47G.

Column 1
An ordinal number indicating the record in the present file.

Column 2
The time in decimal sols on which the data were acquired.

Column 3
The sol number of the mission on which the data were acquired.

Column 4 
The hour of acquisition start.

Column 5
The minute of acquisition start.

Column 6
The second of acquisition start. Note that High rate data are acquired at 
20.2 Hz, thus the 83-sample record corresponds to about 4 seconds.

Column 7 
The first (XYZ)-axis reading.

Column 8
The second (XYZ)-axis reading.

...

Column 89
The 83rd (XYZ)-axis reading.


This description was generated by R. Lorenz on 12/12/2016.