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Landsat

NASA's Landsat satellites provide one of the most important remote sensing data archives for a host of environmental applications, including disaster monitoring. They have been collecting multispectral data at a moderate spatial resolution for over 35 years.

Last year (2008), NASA made access to all Landsat data free. The website links to the free data and provides information on how to use them as well as a selection of images, tutorials and educational resources.

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