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venus90e.txt
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1996-02-22
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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION PASADENA, CALIF.
91109. TELEPHONE (818) 354-5011
PHOTO CAPTION Magellan
P-45392
March 16, 1995
This hemispheric view of Venus, as revealed by more than a decade
of radar investigations culminating in the 1990-1994 Magellan
mission, is centered at 90 degrees east longitude. The Magellan
spacecraft imaged more than 98 percent of Venus at a resolution of
about 100 meters; the effective resolution of this image is about
3 kilometers. A mosaic of the Magellan images (most with
illumination from the west) forms the image base. Gaps in the
Magellan coverage were filled with images from the Earth-based
Arecibo radar in a region centered roughly on 0 degrees latitude
and longitude, and with a neutral tone elsewhere (primarily near
the south pole). The composite image was processed to improve
contrast and to emphasize small features, and was color-coded to
represent elevation. Gaps in the elevation data from the Magellan
radar altimeter were filled with altimetry from the Venera
spacecraft and the U.S. Pioneer Venus missions. An Orthographic
projection was used, simulating a distant view of one hemisphere
of the planet. The Magellan mission was managed for NASA by the
Jet Propulsion Laboratory (JPL), Pasadena, CA. Data processed by
JPL, the Massachusetts Institute of Technology, Cambridge, MA, and
the U.S. Geological Survey, Flagstaff, AZ.