Digital elevation models DEM for the entire globe, covering all of the countries of the world, are available for download on this site. Udvar-Hazy Center in Chantilly, Virginia. Many OpenStreetMap-based projects use SRTM data to provide topography information, relief shading, and elevation profiles for trails and routes. Known issues and future improvements We plan to continue improving the data as and when high-resolution auxiliary datasets become available. Request here Download interface in Chinese: For the United States, data was made available at 1-arc second resolution approximately 30m at the equator , but for the rest of the world, the 1-arc second product is degraded to 3-arc seconds approximately 90m at the equator. There are a total of 3,, voids accounting for , km2, and in extreme cases, such as Nepal they constitute 9.
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SRTM 90m Digital Elevation Database v4.1
Views Read View source View history. Retrieved May 5, This data is provided in an effort to promote the use of geospatial science and applications for sustainable development and resource conservation in the developing world.
Data can be downloaded using a browser or accessed directly from the ftp site. They affect all summits over 8, meters, most summits over 7, meters, many Alpine and similar summits and ridges, and many gorges and canyons. CIAT have processed this data to provide seamless continuous topography surfaces. The tiles are distributed as zip files containing HGT files labeled with the coordinate of the southwest cell.
Whilst micro-scale topographic variation is not captured using this method, most macro-scale features are captured in small-intermediate sized holes.
CGIAR-CSI SRTM – SRTM 90m DEM Digital Elevation Database
This page was last edited on 23 Septemberat These are generally small holes, which nevertheless render the data less useful, especially in fields of hydrological modeling. File names refer to the latitude and longitude of the lower left corner of the tile, and FME cannot read files that do not conform to this convention.
The original SRTM elevations were calculated relative to the WGS84 sttm and then the EGM96 geoid separation values were added to convert to heights relative to the geoid for all the released products. The resolution of the raw data is one arcsecond 30 m along the equator and coverage includes Africa, Europe, North America, South America, Asia, and Australia.
hgg The second process fills small holes iteratively, and the cleaning of the surface to reduce pits and peaks. The original SRTM data has been subjected to a number of processing steps to provide seamless and complete elevational surfaces for the globe.
Download Official download interface multiple 5-degree tiles: The interpolated DEM for the no-data regions is then merged with the original DEM to provide continuous elevational surfaces without no-data regions.
Digital elevation models DEM for the entire globe, covering all of the srrm of the world, are available for download on this site. Retrieved from " https: CIAT shall not be liable for incidental, consequential, or special damages arising out of the use of any data. Heights are in meters referenced to the WGS84 geoid. Digital elevation models Space synthetic aperture radar in spaceflight Satellite meteorology and remote sensing Ht instruments Topography techniques.
The elevation hht derived from the SRTM data are used in geographic information systems. Request here Download interface in Chinese: This data is provided in an effort to promote the use of geospatial science and applications for sustainable development and resource conservation in the developing world. Auxiliary DEMs were available from the following sources: Two datasets offer global coverage void-filled SRTM ugt at full resolution: Two examples at the national level in Peru.
The first processing stage involves importing and merging the 1-degree tiles into continuous elevational surfaces in ArcGRID format.
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CIAT provides these data without any warranty of any kind whatsoever, either express hhgt implied, including warranties of merchantability and fitness for a particular purpose.
There are a total of 3, voids accounting forkm2, and in extreme cases, such as Nepal they constitute 9. Since these files do not contain typical georeferencing information, this information hggt inferred from the filename. We follow the method described by Reuter et al. The dimensions of the three arcsecond tiles are x They find an average vertical error of just 5m in interpolated regions when compared with a DEM derived from cartographic maps, though the maximum error stretches to m in a region with approximately m elevation.
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