Earth imagery
See the following -
Satellites: Make Earth Observations Open Access
Michael A. Wulder & Nicholas C. Coops | Nature | September 2, 2014
...A new era of open-access satellite data has arrived. In 2008, the US Geological Survey (USGS) released for free to the public its Landsat archive, which dates back to the 1970s and is the world's largest collection of Earth imagery...
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