Data Set Overview
  =================
    The Hubble Space Telescope Wide Field Planetary Camera 2 data
    archive contains calibrated data of Mars observed between April
    27, 1999 and September 4, 2001.  These are full-disk images of
    Mars obtained primarily through narrowband filters and in the
    wavelength interval of 255 to 1042 nm.  The data have been
    calibrated to radiance factor, or I/F. The archive is divided into
    13 groups according to different observation dates, and each group
    contains five different types of FITS files:
    1. simple cylindrical projection images in a cube with backplanes
       containing emission and incidence angles
    2. orthographic projection images in a cube with backplanes
       containing latitude, longitude, emission angle, and incidence
       angle
    3. Unprojected image for each wavelength
    4. simple cylindrical projection image for each wavelength
       (used to compile the cube #1)
    5. orthographic projection image for each wavelength
       (used to compile the cube #2)
 
    Important parameters and information can be found in the file
    headers. For the files with the 'RL' prefix, please see near the
    bottom of the header for more organized information.  This can be
    helpful in further manipulation of the data.  For example, The
    value of F (solar flux) used in our calibration process is
    included in the headers with the keyword starting with 'FSUN', so
    that one can go back to radiance units (I).
 
    The following table summarizes some information on the thirteen
    observation groups in the data archive. The first column list the
    observation dates in the format, YYMMDD.  The resolution is the best
    spatial resolution at the sub-Earth point for images obtained on
    the PC1 chip.
      ------------------------------------------------------------------
      Observation   Wavelengths           Diam.   Phase Ang.  Resolution
         Date        (nm)               (inches)   (degree)   (km/pixel)
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       990427       547, 588, 631, 673,   16.2    2.70        19.4
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       990428       547, 588, 631, 673,   16.2    2.92        19.3
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       990501       547, 588, 631, 673,   16.2    5.90        19.3
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       990506       547, 588, 631, 673,   16.1    10.00       19.4
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 375, 410,
       010116       502, 588, 631, 673,   5.7     34.95       54.6
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 375, 410,
       010213       502, 588, 631, 673,   6.9     37.54       45.3
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 375, 410,
       010402       502, 588, 631, 673,   10.6    36.46       29.6
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 375, 410,
       010513       502, 588, 631, 673,   16.4    23.18       19.1
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    410, 502, 588, 631,
       010626       673, 1042, 410,       16.2    2.70        19.4
                    502, 673
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       010809       547, 588, 631, 673,   15.9    38.09       19.6
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       010810       547, 588, 631, 673,   15.8    38.54       19.8
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       010814       547, 588, 631, 673,   15.3    39.66       20.4
                    763, 835, 953, 1042
      ------------------------------------------------------------------
                    255, 336, 410, 502,
       010904       547, 588, 631, 673,   13.0    44.21       24.1
                    763, 835, 953, 1042
      ------------------------------------------------------------------
 
 
  Data
  ====
    The data products are stored as FITS images and cubes.  All files
    with 'IMG' suffix contain 2D image in a simple FITS format.  The
    remaining files with the 'CUB' ending have 3D array consisting of
    2D images stacked in increasing wavelength order (except for
    010626 data set) with additional information stored in the
    backplanes, which have the same array size as the preceding 2D
    images.  The FITS headers contain detailed and tailored
    information about their content.
 
 
  Coordinate System
  =================
    Mars areocentric, west positive.

UNK