01-03-2004, 11:38 PM
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Join Date: Sep 2001
Location: 41.36N-81.32W
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Step Ten: Descent imager takes pictures of the surface
While radar measurements are acquired, a descent imager will take three pictures of the surface and compare high-contrast features (for example, a crater) to determine the horizontal velocity at which the lander is moving across the surface. This measurement helps determine which transverse rockets should be fired in the retro rocket system.
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