Featured Sites
Explore Significant Topographic Surface
Changes in the United States
The U.S. Geological Survey (USGS) Earth
Resources Observation and Science (EROS)
Center Topographic Science team has developed
a Web site that provides a wealth of data about
topographic change across the United States. The
USGS National Inventory of Significant Topographic
Changes is available at
http://topochange.cr.usgs.gov.
The inventory is based on seamless multitemporal
elevation data and land cover data. The need for
more comprehensive information on the nature and
extent of recent human geomorphic activity led to
a spatial emphasis for the first ever accounting
of topographic change across the United States.
Access the USGS National Inventory of
Significant Topographic Changes
(http://topochange.cr.usgs.gov)
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Emergency Operations Portal
 Explore critical pre- and post-disaster images and datasets online for immediate viewing and downloading. The U.S. Geological Survey (USGS) Emergency Operations, in support of the Department of Homeland Security, provides these images for use in disaster preparations, rescue and relief operations, damage assessments, and reconstruction efforts. We supply satellite and aerial images for analysis of disaster areas before, during, and after a disaster.
Access the Emergency Operations Portal
(http://hdds.usgs.gov/)
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Featured Products
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USGS Opening Landsat Archive
Electronic access to the entire USGS Landsat 7 archive, enabling users to download standard-format scenes at no charge, has been an amazing success, with over 225,000 scenes downloaded since October 1st. Previously acquired imagery from Landsat 1 through Landsat 5, is also now available for download at no charge using the same standard processing format. Processing parameters and other details about the products can be found at http://landsat.usgs.gov/products_data_at_no_charge.php". Previously offered USGS Landsat products with customer-defined options, including media, are no longer available.
Newly acquired Landsat 7 ETM+ SLC-off and Landsat 5 TM images with less than 40 percent cloud cover are automatically processed and made available for immediate download. Imagery with greater than 40 percent cloud cover can be processed upon request. Once the requested scenes are processed, an email notification is sent to the customer with instructions for downloading. These scenes will then become accessible to all users. Landsat data can be searched, downloaded, or requested from Glovis or EarthExplorer. High demand for this data may result in slow search performance and processing times, which typically range from 1-3 days for Landsat 7 ETM+ and some Landsat 5 TM data and 3-4 weeks for Landsat 1-5 MSS, Landsat 4 TM and some Landsat 5 TM data. Please contact Customer Service at custserv@usgs.gov with any comments or questions.
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