Earth observation satellites are satellites specifically designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc. Most Earth observation satellites carry instruments that should be operated at a relatively low altitude. Altitudes below 500...
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http://en.wikipedia.org/wiki/Earth_observation_satellite
(from the article `space exploration`) ...and data on a global basis. Satellites operated by the United States and Russia give precision navigation, positioning, and timing information ...
Found on
http://www.britannica.com/eb/a-z/e/2
A satellite designed to observe Earth's surface and atmosphere from orbit. Included in this category are Earth resources satellites, weather satellites, geodesy satellites, and, for military and intelligence applications, reconnaissance satellites.
Found on
http://www.daviddarling.info/encyclopedia/E/Earth_observation_satellite.htm
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