For water bodies, which were prone to voids in the original dataset, the elevations of the water surface have been leveled in the release of the finished version of the. Dec 03, 2014 srtm data have been publicly available relatively soon after the data was processed. Srtm void filled level 2 added to the list of available datasets. Unfortunately this data set contains significant gaps in the coverage. This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1 arcsecond approximately 30m. The data can be downloaded in the download srtm section under the open database license. The shuttle radar topography mission srtm, see farr et al. Srtm consisted of a specially modified radar system that flew on board the space shuttle endeavour. This work aims at providing an interactive interface to download 30m resolution dem for any country. International journal of geographical information science volume 21, issue 9, 2007.
Srtm 90m digital elevation database cgiar platform for. Nasa has released version 2 of the shuttle radar topography mission digital topographic data also known as the finished version. The provision of aster gdem version 2 by nasa and the japanese meti has helped to make this possible. An evaluation of voidfilling interpolation methods for srtm data. The voids occur in areas where the initial processing did not meet quality specifications. Shuttle radar topography mission srtm data access and.
The new data are available for download from the usgs eros data center see. Input gdem was rejected if more than 80 m different from srtm. It also happens to offer their version 4 srtm which has the gaps filled. Aster gdem2 usgs gmted2010 usgs national elevation dataset ned collected at 1 arc second. Data can be downloaded using a browser or accessed directly from the ftp site. This interface attempts to ease the pain of downloading 30meter resolution elevation data from the shuttle radar topography mission click on yellow tiles to download their corresponding data. Two resolutions of finished grade srtm data are available through earthexplorer from the collection held in the usgs eros archive. Note that the former contains ellipsoidal elevations and the later geoidal ones.
Space shuttle radar topography mission several srtm data versions and products are available. Srtm data have been publicly available relatively soon after the data was processed. The srtm digital elevation data, produced by nasa originally, is a major. Data for this version can be downloaded from this usgs directory page. These are the highest quality srtm data available to date. Srtmgl3 is the default 3arcsecond data for the world obtained by averaging the 1arcsecond raw data. This suite of products at three different resolutions approximately 1,000, 500, and 250 meters is. These files have been processed to fill data voids and there is a corresponding kmz file which contains a 90meter index for growing srtm data. The new srtm data are released at the version 3 processing level, which have been void filled. Thanks for contributing an answer to geographic information systems stack exchange. Shuttle radar topography mission srtm data products and non published srtm for canada. To give an idea, how many areas are affected by the voids. Global multiresolution terrain elevation data 2010. Srtm data validation and applications srtm 1 arcsecond global void filled data tiles are available for download via usgs earthexplorer web site.
For small data voids, which account for the majority of holes hall et al. The new model is called the global multiresolution terrain elevation data 2010, or gmted2010 for short. Without the publication of aster gdem version 2, the task of filling the large srtm desert voids would have taken considerably longer. Shuttle radar topography mission srtm 3 product name version resolution coverage available from srtmgl30 2. Coverage map for srtm void fill data from linked coverage map of elevation data from.
Earthexplorer fgdc metadata srtm void filled srtm1n39w099v2. The srtm void filled data set are the result of this additional processing. Global srtm at 30m resolution center for earth observation. As with daps srtm us elevation 30m dataset, the new srtm grids are provided in geosoft grid format. In 2002 the nasa and usgs released a global data set of the earth surface geometry in 3 arc second 90m resolution obtained during a space shuttle mission in 2000. Usgs earthexplorer hosts worldwide coverage of void filled data and provides open distribution of this highresolution global dataset. The main issue with gdem is artificial trash on the flat sands. By cgiarcsi january 4, 2019 february 8, 2019 continue reading cgiar consortium for spatial information cgiarcsi is the geospatial science community of practice that facilitates cgiars use of geospatial data and analysis in research. This interface attempts to ease the pain of downloading 30meter resolution elevation data from the shuttle radar topography mission click on yellow tiles to download their corresponding data tiles come as zipped srtmhgt files at 1arcsecond resolution 3601x3601 pixels in a latitudelongitude projection, downloaded from nasa servers. Srtm void filled digital object identifier doi number. Africa dem data for all of africa can be downloaded via the world coverage map. The srtm 1 arcsecond global data offer worldwide coverage of void filled data at a resolution of 1 arcsecond 30 meters and provide open distribution of this highresolution global data set. These voids were filled by a 33 matrix with the mean value zero values were ignored. Srtm elevation data of the earths land surface are available with data points posted every 1.
Srtm2osm tool uses shuttle radar topography mission. These voids can be filled using a range of interpolation algorithms in conjunction with other sources of elevation data, but there is. Jplnasa version 1 srtm nonvoid filled, unedited elevation data us. The srtm collections are located under the digital elevation category see picture at the end. These data had voids filled using other data sources such as the aster gdem2, gmted2010, and ned. The process was performed 3 times inn order to eliminate all voids.
Height data from these sites or data files in the same formats are supported. The void filled srtm data from viewfinder panoramas are high quality at full srtm resolution. Srtm elevation data of the earths land surface are available with data points spaced at 1 arc second for the united states and at 3 arc seconds for global coverage. Asking for help, clarification, or responding to other answers. Input gdem was rejected if more than 80 m different from prism, unless input gdem num number pixel value was 3 or more.
Sean buckley, nasas jet propulsion laboratory our objective is to provide the scientific and civil communities with a stateoftheart global digital elevation model dem derived from a combination of shuttle radar topography mission processing improvements, elevation control, voidfilling and merging with data unavailable at the time of the original srtm. The global multiresolution terrain elevation data 2010 gmted2010 dataset contains elevation data for the globe collected from various sources. Version 2 is the result of a substantial editing effort by the national geospatial intelligence agency and exhibits welldefined water bodies and coastlines and the absence of spikes and wells. Srtm data, in hgt format, can be downloaded from here, but for some mountain and desert areas there are nodata void and phase unwrapping error areas. Shuttle radar topography mission srtm void filled usgs. The data are available for download via earthdata search, the lp.
The digital elevation model that has been derived from the february 2000 shuttle radar topography mission srtm has been one of the most important publicly available new spatial data sets in recent years. Since november 2012 there is free and global coverage at 3 arc seconds available. A method to fill voids uses a variety of interpolators. Traditionally, there are three types of methods to fill voids in dem like srtm, which are available in arcgis.
Shuttle radar topography mission srtm data products and non published srtm for canada source for northern canada and void filling. Download here the evaluation version and if you wish the corrected n46e009 srtm tile. Shuttle radar topography mission srtm data have been enhanced to fill areas of missing data void filled to provide more complete digital elevation data with a resolution of 1 arcsecond 30 meters and 3 arcseconds 90 meters for global coverage. This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1. Srtm plus uses srtm version 2 see below where the radar interferometric method was successful not void. An overview of the different versions is given in figure 2 in the srtm user guide jplnasa version 1 srtm nonvoid filled, unedited elevation data us. We define a void in the srtm dataset as an area over the landsurface, which contains nodata and is not a water body. The version of the dataset available here is breakline emphasis, 7. Srtm digital elevation data 30m earth engine data catalog. This code also gives you hillshade, elevation palette, and sea mask.
Breakline emphasis maintains the critical topographic features streams or ridges within the landscape by maintaining any minimum elevation. If youre interested in images and visualizations created from srtm data, go to the image product description page. Shuttle radar topography mission srtm data access and application. These data are only available at the usgs earth explorer site in one degree tiles. This data is currently distributed free of charge by usgs and is available for download from the national map seamless data distribution system, or the usgs ftp site. The glcf is also a convenient way to browse and download srtm data, in geotiff format for more information, see the glcf srtm page. Incorporated changes in metadata to accommodate for the switch to landsat multimission datasets. If you want to download srtm data, those data are available at the us geological surveys eros data center for download. Digital elevation data with srtm voids filled using. Nasa shuttle radar topography mission srtm version 3. Srtm2osm tool uses shuttle radar topography mission digital elevation model dem to generate elevation contours isohypses of a selected terrain. Dec 27, 2017 srtm void filled level 2 added to the list of available datasets. Mapping the earth the shuttle radar topography mission.
This article presents a new technique for filling voids in srtm dem data. Also note, that the freeware program dgterrain viewer comes with a free tool to join srtm tiles on a larger one. Srtm data void filled national aeronautics and space administration applied remote sensing training program 12 gdex. Shuttle radar topography mission 1arc second global. Srtm shuttle radar topography mission center for earth.
The collections are located under the digital elevation category below the srtm subcategory. An overview of the different versions is given in figure 2 in the srtm user guide. Filling the voids in the srtm elevation model a tin. They will be posted in stages, with most of africa and a portion of southern europe available as of this writing. Users should be aware that these data are intended for use with a geographic information system gis or other special application software, and are not.
The data sets he offers are in the same format and resolution as the srtm data so the same tools can be used for processing them. Void filled srtm plus released srtm nasa v3 nasa has released a void filled version of the shuttle radar topography mission digital elevation model, known as srtm plus or srtm nasa version 3. In november 20 nasa released version 3 of the srtm data. Global multiresolution terrain elevation data 2010 gmted2010. Shuttle radar topography mission srtm non void filled north of juneau, alaska.
Nasa shuttle radar topography mission srtm v3 global 1 arc second. This page provides a summary of how i have filled the nodata voids in the dem data from the srtm, using. Free world at 1 arc second resolution 30m radio mobile download site 1. Srtm 90m digital elevation database cgiar platform for big. Digital elevation data with srtm voids filled using accurate. The nasa shuttle radar topographic mission srtm has provided digital elevation data dems for over 80% of the globe. Srtm elevation data of the earths land surface are available with data points posted every 1 arc second for global coverage. Shuttle radar topography mission srtm nonvoid filled. As with the version 2 data on the usgs site, these data are. The tool writes contours as osm ways into an osm file. An evaluation of voidfilling interpolation methods for.
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