DATE SET OVERVIEW

      This data set consists of visual and infrared mapping spectrometer
      cubes from the Cassini VIMS instrument obtained during the period
      1999-01-10 and the present delivery.  These data
      cubes are the uncalibrated data numbers as seen by the VIMS
      detectors.

      PARAMETERS

      The integration period or exposure time of each VIMS pixel is a
      configurable parameter.  The actual exposure time of the VIMS pixel
      is defined in the detached PDS label for each cube.  The VIMS
      spatial resolution is approximately 0.5x0.5 mrads /pixel. The
      measured values in the cubes are data numbers (DN) or the number
      of counts measured by the detector.

      PROCESSING

      The only data processing performed on these cubes was the
      reformatting of the raw EDRs into ISIS compliant format.  These
      data cubes are effectively uncalibrated and unprocessed data,
      delivered to the PDS in the same format they are received by the
      VIMS Operations Center.

      DATA

      There is only one data type associated with this volume, the raw
      uncalibrated DNs.

      ANCILLARY DATA

      The ancillary data required to apply a radiometric and geometric
      correction to this data set are:

       1. Cassini-NAIF Kernels - Supplied by the Cassini Project.
       2. VIMS flat field cubes - included in this data set volume.
          (ir_flatfield.qub,ir_hires_flatfield.qub,
          ir_nyquist_flatfield.qub,vis_flatfield.qub,
          vis_hires_flatfield.qub)
       3. VIMS performance vector table cubes - included in this data
          set volume. (ir_perf.qub,vis_perf.qub)
       4. VIMS wavecal cube containing:

                         (h*c)
              ---------------------------
             (lambda*A*omega*delta_lambda)

          where lambda is the wavelength in microns, A is the area of
          the primary mirror in square centimeters, omega is the solid
          angle subtended by a pixel in steradians, and delta_lambda is
          width of the spectel. - included in this data set volume.
          (wavecal.cub)
       5. VIMS solar spectrum cube - included in this data set volume.
          (solar.qub)
       6. VIMS Vis instrument dark model tables - included in this
          data set volume. (vis_hires_dark_model.tab,
          vis_lowres_dark_model.tab)

       COORDINATE SYSTEM

       Each pixel in the VIMS IR and Visual channel has a pointing vector
       associated with it.  The vectors, which can be found in item
       4 of the Ancillary Data section, are relative to VIMS reference
       frame.  It should be noted here that the unit vector table and
       rotation matrix listed in item 4, 5 of the Ancillary Data section,
       respectively, assume the following about the VIMS reference frame:

        1. The boresight of each channel is at pixel x=31.5, z=31.5.
        2. The boresight unit vector of each channel is defined as
           x=0, y= -1, z=0.

      SOFTWARE

      The software to apply a radiometric and geometric correction to these
      data has been supplied with the data set.

      This software requires the use of:
        IDL (Interactive Data Language from RSI)
          http://rsinc.com/
        ISIS (Integrated Software for Imagers and Spectrometers
              from the USGS)
          http://isis.astrogeology.usgs.gov/Isis2/isis-bin/isis.cgi
        C compiler
          http://gcc.gnu.org/

      MEDIA/FORMAT

      The VIMS archive will be delivered to the PDS Central Imagining Node
      via electronic DVD images.  The DVD image will contain binary and
      ASCII text files.

CONFIDENCE LEVEL OVERVIEW

      This is a good data set.  Known problems are minor.

      REVIEW

      This archival data set was examined by a peer review panel
      prior to its acceptance by the Planetary Data System (PDS).
      The peer review was conducted in accordance with PDS
      procedures. Some data have been studied in detail by the
      VIMS science team.  These data appear to be of good quality.

      DATA COVERAGE AND QUALITY

      Due to the orbit of Cassini around Saturn during most of its
      mapping operations, parts of the orbital coverage will have higher
      resolution and higher SNR than others.  During the planning
      stages every effort was made to ensure the best data coverage
      throughout the Cassini mission.  The VIMS operations center has
      provided checks to assure the data quality.  However,
      mistakes can and will occur.  The user of these data should
      review the errata.txt file that describes anomalies that may
      affect the quality of the data.

      LIMITATIONS

      The data have not been calibrated and/or geometrically corrected.