The clock is ticking on a timeline for providing free electronic access to the complete U.S. Geological Survey (USGS) archive of Landsat images. Although recent images have been available since early this year, the complete USGS archive dating back to 1972 should be available before February 2009, according to a USGS statement.
The complimentary access is part of a transition toward a National Land Imaging Program sponsored by the Secretary of the Interior, according to the statement. For more information and to access the images, click on Data Access at the USGS Landsat site.