Two New SRTM Elevation Products Now Available
The USGS EROS Data Center is pleased to announce the release of "Finished" 1 arc second (30-meter) Shuttle Radar Topography Mission (SRTM) digital elevation data on Mar 24, 2004 that has been provided by the National Geospatial-Intelligence Agency (NGA). SRTM is a cooperative project between the National Aeronautics and Space Administration (NASA) and the NGA. The radar data were acquired through the use of multiple antennas aboard the NASA Space Shuttle Endeavour during February 11-22, 2000. The mission acquired data from 60° north latitude to 56° south latitude.

Two "Finished" SRTM 1-arc second (30 m) product offerings are now available from EDC in a DTED® and SRTM format. The standard NGA DTED® formatted data can be searched and ordered from http://earthexplorer.cr.usgs.gov/srtmdted2/. The SRTM format, which is a binary raster format derived from the NGA DTED® product, can be searched and ordered from http://earthexplorer.cr.usgs.gov/srtmbil2/.

SRTM data is being used to generate a digital topographic map of the Earth's land surface with data points spaced every 1 arc second for the United States of latitude and longitude (approximately 30 meters). The absolute horizontal and vertical accuracy is 20 meters (circular error at 90% confidence) and 16 meters (linear error at 90% confidence), respectively.

Suggested weblinks:

• http://edc.usgs.gov/products/elevation/srtm.html
• http://edc.usgs.gov/products/elevation.html
• http://srtm.usgs.gov/