(12/13/1999) -- Space Shuttle Endeavour is viewed between two tree trunks in this photo during the Shuttle's rollout to Launch Pad 39A for launch of mission STS-99. Named the Shuttle Radar Topography Mission (SRTM), it involves an international project spearheaded by the National Imagery and Mapping Agency and NASA, with participation of the German Aerospace Center DLR. The SRTM consists of a specially modified radar system that will gather data for the most accurate and complete topographic map of the Earth's surface that has ever been assembled