PDS_VERSION_ID               = PDS3
RECORD_TYPE                  = STREAM

SPACECRAFT_NAME              = "CASSINI ORBITER"
INSTRUMENT_NAME              = "COMPOSITE INFRARED SPECTROMETER"
DATA_SET_ID                  = "CO-S-CIRS-2/3/4-TSDR-V3.1"
 
OBJECT                       = TEXT
  PUBLICATION_DATE           = 2011-07-01
  NOTE                       = "Overview of the DATA directory and its
subdirectories on this volume."
END_OBJECT                   = TEXT
END

DATA Directory Area Contents
----------------------------


  This directory contains four subdirectories, each of which contains 
  particular types of files. These provide Raw data (interferograms) 
  and calibrated data (spectra), with associated pointing, navigation 
  and spacecraft orientation information. The four subdirectories are:

    APODSPEC/    apodized, i.e. calibrated and resampled, spectra.
                 
    HSK_DATA/    raw housekeeping data.
                 
    NAV_DATA/    navigation and pointing data.
    
    UNCALIB/     uncalibrated data.

File conventions
----------------
  All of the files are accompanied by PDS label files <fileroot>.LBL 
  where <fileroot> is the same for both the label file and the file it 
  describes. For each data file type in a subdirectory, there is a 
  corresponding format file (.FMT). The combination of a label file 
  and the corresponding format file fully describes an individual data 
  file. 

  Files with the .DAT and .VAR extensions are binary format data files 
  in two parts. Their format is designed to be accessed by the Vanilla 
  program. Hence the files FILENAME.DAT and FILENAME.VAR are two 
  halves of a whole: the .DAT file is the fixed-length record part and 
  the .VAR is the variable length record file. The pair is described 
  by a single PDS label.

  The FILENAME is typically a 3 or 4 letter string followed by 8-digit 
  number. The letter string identifies the type of information stored 
  therin, and the 8-digit number YYMMDDHH gives the start date and 
  time DD/MM/YY HH:00:00 of the four-hour period to which the data 
  pertain.

Specific directory contents by subdirectory and file type
---------------------------------------------------------

DATA/
  DATAINFO.TXT  Description of the contents of the DATA directory and
                its subdirectories (this file).

    APODSPEC/    
         ISPM   calibrated, re-sampled (interpolated) spectral 
                data. After FFT transform, data as resampled onto a 
                standard spectral grid.
                
    HSK_DATA/    
          HSK   binary data records for raw housekeeping data
                
    NAV_DATA/    
          GEO   binary data records for spacecraft orientation 
                relative to primary body, earth, sun, and  moons.
          POI   binary data records for detector intercept 
                location, orientation and other info on the target body 
                (e.g., incident angle on planet, smear, FOV filling 
                factor).
          RIN   binary data records for detector intercept location, 
                orientation and other information on ring observations.
          TAR   binary data records for target identification in 
                the FOV of each detector.
  
     UNCALIB/     
         DIAG   binary data records for IFM diagnostic 
                information.
          FRV   binary data records for IFM fringe voltages.
         IFGM   binary data records for raw interferogram data.
         IHSK   binary data records for housekeeping data 
                interpolated onto the same time-steps as 
                observations.
          OBS   binary data records for observation parameters.
                
In addition to data files, each subdirectory contains a supplemental 
file:

  DATASET.TXT  Vanilla DATASET file (ASCII), listing the types of 
               Vanilla files to search for in the directory.