Users should acknowledge CIAT as the source used in the creation of any reports, publications, new datasets, derived products, or services resulting from the use of this dataset. 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. Skip to content Close Search for: For areas without a high-resolution auxiliary DEM: 
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GB SRTM Digital Elevation Model (DEM) 90m
No-data regions due to insufficient textural detail were especially found in mountainous regions Himalayas and Andes, for exampleor desertic regions e.
This dataset is very detailed along shorelines and contains all small islands.
The original SRTM data has been subjected to a number of processing steps to provide seamless and complete elevational surfaces for the globe. They can be downloaded freely over the Internet, and their file format.
Shuttle Radar Topography Mission
Other developers, including NASA World Wind and Google Earthhave improved their results by using 1- arc-second for the United States and 3- arc-second for the rest of the world, data in the interpolation process, but, due to the poor resolution of these data, and very poor quality of some of them, they have further improved their earth viewing services by adding data from other sources. There are some SRTM data sources which have filled these data voids, but some of these have used only interpolation from surrounding data, and may therefore be very inaccurate.
Automated object-based classification of topography from SRTM data. All are produced from a seamless dataset to allow easy mosaicing. Archived from the original on 17 October Intermap Technologies was the prime contractor for processing the interferometric synthetic aperture radar data.
Groups of scientists have worked on algorithms to fill the voids of the original SRTM data. We would like to thank the colleagues in the Land Management and Natural Hazards Unit and the Global Environmental Monitoring unit for their support to provide this data. The method used is based on the size of the hole, and the landform that surrounds it.
Data can be daa using a browser or accessed directly from the ftp site. The method presented here for filling in the no-data holes in the original SRTM release is by no means the only method available.
SRTM 90m Digital Elevation Database v4.1
There are a total of 3, voids accounting forkm2, and in extreme cases, such as Nepal they constitute 9. Retrieved 24 July Version 2 has the shorelines clipped. Data can be downloaded using a browser or accessed directly from the FTP datz. Whilst micro-scale topographic variation is not captured using this method, most macro-scale features are captured in small-intermediate sized holes.
For areas with a high-resolution auxiliary DEM: Retrieved 10 October Download Official download interface multiple 5-degree tiles: The SRTM digital elevation data, produced by NASA originally, is a major breakthrough in digital mapping of the world, and provides a major advance in the accessibility of high quality elevation data for large portions of the tropics and other areas of the developing world.
Retrieved from " https: The elevation datasets are affected by mountain and desert no-data areas. Version History Change from Version 3 to Version 4 Version 4 uses a number of interpolations techniques, described by Reuter et al. When hydrological models are applied to the interpolated DEM and the cartographic DEM, little difference is found in hydrological response in terms of overland flow and discharge.
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. The DEM files have been mosaiced into a seamless near-global coverage up to 60 degrees north and southand are available for download as 5 degree x 5 degree tiles, in geographic coordinate system — WGS84 datum. This process interpolates through the no-data holes, producing a smooth elevational surface where no data was originally found.
We follow the method described by Reuter et al. Users should acknowledge CIAT as the source used in the creation of any reports, publications, new datasets, derived products, or services resulting from the use of this dataset. Digital elevation models DEM for the entire globe, covering all of the countries of the world, are available for download on this site. All are produced from a seamless dataset to allow easy mosaicing.
These amount to no more than 0.
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