The Mars Descent Imager (MARDI) will help pinpoint the landing site for the Mars Polar Lander. MARDI will produce wide-angle views of the Martian surface beginning about 10 seconds after the lander's parachute has been deployed, at approximately 8 kilometers (5 miles) in altitude, until its landing. These pictures will be used to provide a larger geographic context for local landforms around the landing zone, and to help tie together images from the orbiter with the exact landing site.