The EarthExplorer service from the United States Geological Survey (USGS) provides a search interface to a collection of datasets and images including aerial photography, Advanced Very High Resolution Radiometer (AVHRR) images, IKONOS-2 images, digital elevations, digital line graphs, Earth Observing 1 (EO-1) images, forest carbon sites, Global Land Surveys (GLS), Landsat images and Spaceborne Imaging Radar C-band images. Results from some datasets can be downloaded free; some commercial satellite scenes of US sites are licensed solely for US users.
http://edcsns17.cr.usgs.gov/EarthExplorer/
Copyright 2006-2010
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