1. The landsat legacy;Williamson;Photogrammetric Engineering and Remote Sensing,1997
2. An evaluation of national policies governing the united states civil satellite land remote sensing program;Lauer,1990
3. Baker JC, O’Conner K, Williamson RA, editors. Commercial observation satellites: at the leading edge of global transparency. Washington, DC: RAND and American Society of Photogrammetry and Remote Sensing, April 2001.
4. Ibid.
5. Landsat 7 sensor glitch exposes inadequate contingency planning;Bates;Space News,2003