(01/30/2000) -- The day before the expected launch of STS-99, Mission Specialist Janet Lynn Kavandi poses for photographers near Launch Pad 39A where family and friends have gathered to greet the crew. STS-99, known as the Shuttle Radar Topography Mission (SRTM), is scheduled to lift off 12:47 p.m. EST from Launch Pad 39A. The SRTM will chart a new course to produce unrivaled 3-D images of the Earth's surface, using two antennae and a 200-foot-long section of space station-derived mast protruding from the payload bay. The result of the Shuttle Radar Topography Mission could be close to 1 trillion measurements of the Earth's topography. Besides contributing to the production of better maps, these measurements could lead to improved water drainage modeling, more realistic flight simulators, better locations for cell phone towers, and enhanced navigation safety. The mission is expected to last about 11days, with Endeavour landing at KSC Friday, Feb. 11, at 4:55 p.m