This image from NASA's Mars Odyssey is from the Cydonia region of Mars. It illustrates how difficult it can be to identify modified impact craters in a region of collapse pits/craters. Generally collapse craters/pits have no rims and form lines.

figure 1 for PIA07174

This VIS image is from the Cydonia region of Mars. It illustrates how difficult it can be to identify modified impact craters in a region of collapse pits/craters. Generally collapse craters/pits have no rims and, due to structural control, form lines. Collapse pits/craters also may coalesce into scalloped-edged trenches. In this image, only the small rimmed features are likely to have formed due to impact.

Image information: VIS instrument. Latitude 30.9, Longitude 345.2 East (14.8 West). 19 meter/pixel resolution.

Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

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