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
Landsat 7 ETM+ Data Now Available at No Charge
October 1, 2008 – All Landsat 7 ETM+ scenes held
in the USGS EROS archive are now available at no
charge. Newly acquired Landsat 7 ETM+ SLC-off
images with less than 40 percent cloud cover are
automatically processed and made available for
immediate download, while all remaining Landsat 7
ETM+ scenes 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 7 ETM+ data can be searched, downloaded,
or requested from EarthExplorer
(http://earthexplorer.usgs.gov)
or Glovis (http://glovis.usgs.gov).
Processing parameters and other details about
the products can be
found at http://landsat.usgs.gov/products_data_at_no_charge.php
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