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RECORD_TYPE                    = STREAM
PRODUCT_CREATION_TIME          = 1993-07-27
OBJECT                         = TEXT
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END    
 
              Schiaparelli Hemisphere - Point Perspective
              -------------------------------------------
                 
Mosaic of the Schiparelli hemisphere of Mars projected into point
perspective, a view similar to that which one would see from a
spacecraft. The viewer's distance is 2,500 kilometers above the surface
of the planet. This mosaic is composed of about 100 red and violet
filter Viking Orbiter images. The images were acquired in 1980 during
mid northern summer on Mars (aerocentric solar longitude = 89 degrees).
The center of this image is near the impact crater Schiaparelli, 450
kilometers in diameter. (latitude -5 degrees, longitude -20 degrees). 

For the GIF formatted files, the color variations have been enhanced by
a factor of two, and the large-scale brightness variations (mostly due
to sun-angle variations) have been normalized by large-scale filtering. 

The dark streaks with bright margins emanating from craters in the Oxie
Palus region, upper left of image, are caused by erosion and/or 
deposition by the wind. Bright white areas to the south, including the
Hellas impact basin at extreme lower right, are covered by carbon
dioxide frost. 

Image Processing by Jody Swann/Tammy Becker/Alfred McEwen, using the
PICS (Planetary Image Cartography System) image processing system
developed at the U.S. Geological Survey in Flagstaff, Arizona.