![]() ![]() The flycast maneuver was designed to reduce strain on the almost 200 foot (61 m) mast extending from Endeavour 's payload bay when adjustments to Endeavour 's orbit were needed. The first of a series of "flycast" maneuvers during the mission was also made on the second day of flight. Measures to reduce the expenditure were evaluated and based on the analysis, enough propellant could be saved to complete the planned 9-day plus science mission. ![]() As a result of this failure, orbiter propellant was being used at a higher-than-planned rate to maintain the attitude of the vehicle. The increase was caused by a failure of the payload cold-gas thrust system that was used to offset the gravity gradient torque of the mast. Mapping proceeded fairly smoothly, but during an attitude-hold period for payload mapping during the second day of flight, it was determined that orbiter propellant usage had doubled from 0.07 to 0.15% an hour. STS-99 ends as Space Shuttle Endeavour lands at the Shuttle Landing Facility, 22 February 2000. Data was sent to the Jet Propulsion Laboratory for analysis, and early indications showed the data to be of excellent quality. Crewmembers split into two shifts so they could work around the clock, and began mapping an area from 60 degrees north to 56 degrees south. After a successful checkout of the radar systems, mapping began at 00:31 EST, less than 12 hours after launch. The Shuttle Radar Topography Mission mast was deployed successfully to its full length, and the antenna was turned to its operation position. 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 result of the Shuttle Radar Topography Mission was close to 1 trillion measurements of the Earth's topography. It produced digital topographic map products which met Interferometric Terrain Height Data (ITHD)-2 specifications (30 meter x 30 meter spatial sampling with 16 meter absolute vertical height accuracy, 10 meter relative vertical height accuracy and 20 meter absolute horizontal circular accuracy). SRTM used C-band and X-band interferometric synthetic aperture radar (IFSAR) to acquire topographic data of Earth's land mass (between 60°N and 56°S). This radar system gathered around 8 terabytes of data to produce high-quality 3-D images of the Earth's surface. SRTM consisted of a specially modified radar system that flew onboard Endeavour during its 11-day mission. Its objective was to obtain the most complete high-resolution digital topographic database of the Earth. Department of Defense, and NASA, with participation of the German Aerospace Center DLR. The Shuttle Radar Topography Mission (SRTM) was an international project spearheaded by the National Imagery and Mapping Agency (now the National Geospatial-Intelligence Agency), an agency within the U.S. Mission highlights STS-99 launches from Kennedy Space Center, 11 February 2000. ![]() ![]() STS-99 was also the first Shuttle mission of the 2000s. This was also the last solo flight of Endeavour all future flights for Endeavour became devoted to the International Space Station. The primary objective of the mission was the Shuttle Radar Topography Mission (SRTM) project. STS-99 was a Space Shuttle mission using Endeavour, that launched on 11 February 2000 from Kennedy Space Center, Florida. ![]()
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