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)
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/)