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Earth Resources Observation and Science (EROS)
EROS is the data centre for the USGS mapping mission. Global coverage datasets available from EROS include:
* aerial photography
* map products
* Digital Elevation Models
* Satelite datasets
* Land Cover Maps.
Most data are free and can be downloaded directly from the website using their EarthExplorer tool. Most of the data is free however, to download some data sets you have to register.
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