Earth observation satellite
Earth observation satellites or Earth remote sensing 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. 
The first occurrence of satellite remote sensing can be dated to the launch of the first artificial satellite, Sputnik 1, by the Soviet Union on October 4, 1957. Sputnik 1 sent back radio signals, which scientists used to study the ionosphere.
NASA launched the first American satellite, Explorer 1, in January 31, 1958. The information sent back from its radiation detector led to the discovery of the Earth's Van Allen radiation belts.
The TIROS-1 spacecraft, launched on April 1, 1960 as part of NASA's TIROS (Television Infrared Observation Satellite) Program, sent back the first television footage of weather patterns to be taken from space.
, more than 150 Earth observation satellites were in orbit, recording data with both passive and active sensors and acquiring more than 10 terabits of data daily.
Canadian Space Agency
With the launch of Alouette 1 in September 1962 Canada became the third country to put an artificial satellite into space. At the time, Canada only possessed upper atmospheric launch capabilities (sounding rockets), therefore, Alouette 1 was sent aloft by the American National Aeronautics and Space Administration (NASA) from Vandenberg Air Force Base in Lompoc, California. The technical excellence of the satellite, which lasted for ten years instead of the expected one, prompted the further study of the ionosphere with the joint Canadian-designed, US-launched ISIS satellite program. This undertaking was designated an International Milestone of Electrical Engineering by IEEE in 1993. The launch of Anik A-1 in 1972 made Canada the first country in the world to establish its own domestic geostationary communication satellite network.