PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF.  91109

PHOTO CAPTION                                MAGELLAN
                                             P-39195
                                             Oct. 29, 1991

This full-resolution mosaic centered at 59.1 degrees south
latitude, 86.5 degrees east longitude in the Lada Terra Region on
Venus is an anaglyph, or combined image, consisting of two data
sets slightly displaced from each other and projected in red and
blue.  This produces a 3-dimensional or stereo effect when viewed
through red and blue tinted glasses.  Magellan "looked" at the
surface from different incidence angles (20 and 14 degrees from a
line perpendicular to the surface) as it passed over the same
part of the surface in the first and second mapping cycles
(November 1990 and July 1991, respectively).  The ability to see
both the radar image and differences in elevation together is
valuable for geologic interpretation.  The image is of an area
approximately 100 kilometers (62 miles) on a side and shows a
deep trough approximately 110 kilometers (68 miles) long, and 8
to 12 kilometers (5 to 7 miles) wide.  Analysis of geometric
distortions in the two images shows the trough to be about 800
meters (0.5 mile) deep.