NORAD ID: 25682 Int'l Code: 1999-020A Perigee: 708.0 km Apogee: 710.7 km Inclination: 98.0 ° Period: 98.8 minutes Semi major axis: 7080 km RCS: 4.7002 m<sup style="color: rgb(51, 51, 51); font-family: Arial;">2</sup> (large) Launch date: April 15, 1999Source: United States (US)Launch site: AIR FORCE WESTERN TEST RANGE (AFWTR)LANDSAT 7 was a joint project between NASA, NOAA, and the US Geological Survey to obtain continuous high-resolution imagary of the Earth's surface. The satellite's main capabilities: environmental monitoring, disaster assessment, land use and regional planning, cartography, range management, oil and mineral exploration. Under the Land Remote Sensing Act of 1992 (PL 102-555), the Landsat program returned to the US Government and responsibilities assigned to NASA, NOAA, and the USGS. The Landsat 7 carried one instrument: (the Enhanced Thematic Mapper Plus (ETM+) The ETM+ was an improved version of the ETM on Landsat 6. The instrument provided improved spatial resolution. The LANDSAT 7 spacecraft provided improved ephemeris and attitude determination. The LANDSAT 7 spacecraft was built by Lockheed Martin Missiles and Space.