Data Set Overview
  =================
    Goldstone radar observations of 1620 Geographos from August 28 through
    Sept. 2, 1994 yield delay-Doppler images whose linear spatial
    resolutions range from ~75 to ~151 meters, and 138 pairs of
    dual-polarization (OC/SC) (opposite circular/same circular) spectra
    with one-dimensional resolution of 103 m. These data are presented in
    Ostro, et al. 1996, Icarus 121, 46 [OSTROETAL1996], and are included
    in this data set.  A full description of the observations and the
    reduction process is provided in the paper.
 
 
  Data
  ====
    Individual images from each successful radar run are in FITS files
    'ge[Nxx].fit' where N is the last digit of DOY (day of year) and xx is
    the run number within that day.  The low-resolution images are
    collected in a collage image 'gelrmov.fit', and the high-resolution
    images in a collage image 'gehrmov.fit'. Multi-run sums of
    co-registered images from 30 degree blocks of rotational phase, for
    the low- and high-resolution images respectively, are in files
    'gelrsum.fit' and 'gehrsum[N].fit' (N=1,3 for the three
    high-resolution summed images).  The collages and summed images are
    the same as the data presented in Figures 8-11 of the paper.
 
    The scaling of the images is explained in the following excerpt from
    the paper:  'Data values for each image in this paper are mapped onto
    a 256-level gray scale.  Since the noise background is not
    interesting, all data values below a clipping level near the noise
    mean are mapped to black to make the most of the gray scale's
    available dynamic range.  Similarly, all data values above some
    saturation level are mapped to white, since the contrast at the very
    highest echo levels contains less interesting information than
    contrast among the more abundant dimmer pixels.'  The levels chosen
    for clipping and saturation level for each image are recorded in the
    label description for that image.
 
    138 individual continuous wave (cw) power spectra are collected in the
    file 'gecwall.tab', and spectra from the bandwidth extrema are in
    'gecwext.tab'.  These spectra are the same as those presented in
    Figures 2 and 7 of the paper.
 
 
  Ancillary Data
  ==============
    An index of the data with observational circumstances for each run is
    given in the file geindex.tab.

Review
  ======
    This data set underwent external peer review on March 23, 1998.