SRTM (Shuttle Radar Topography Mission)
The Shuttle Radar Topography Mission (SRTM) was a 10-day mission which flew on the Space Shuttle Endeavour in February 2000. It was a cooperative project between NASA and the National Geospatial Intelligence Agency (NGA, formerly NIMA and DMA) that collected high-resolution topographic data for most of the land surfaces between -56 and 60 degrees latitude. Data was collected using a method called single-pass radar interferometry, with two imaging radar systems on the Shuttle separated by a 60 meter mast. This technology is based on the Spaceborne Imaging Radar - C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that was used on two previous Shuttle missions.
There are three different SRTM data sets that differ in their grid spacing:
Other groups have also created void-filled versions of SRTM data. One of these is CGIAR-CSI (Consultative Group on International Agricultural Research, Consortium for Spatial Information), and their versions are called "Version 3" or "Version 4". The US Geological Survey also created their own void-filled and "hydrologically-sound" version to support the HydroSHEDS project.
How to Import
Choose Import DEM → SRTM DEM (.hgt) from the File menu and then select the file, which will usually have the filename extension "*.hgt". If the DEM is in GeoTIFF format, instead choose GeoTIFF.
The primary SRTM data (V1 and V2) is distributed by the EROS Data Center (EDC) of the US Geological Survey (USGS) and can be downloaded. SRTM V3 is currently available from LPDAAC.
Coverage includes most land surfaces between -56 and 60 degrees latitude. Within the USA, the full-resolution data will be released without restrictions. Outside the USA, the grid spacing is reduced from 1 to 3 arcseconds.
SRTM Home: http://www.jpl.nasa.gov/srtm
Data Products: http://www.jpl.nasa.gov/srtm/dataproducts.html
Data at the USGS: http://srtm.usgs.gov
Data for the Americas, Eurasia and Africa: ftp://edcsgs9.cr.usgs.gov/pub/data/srtm
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