This page provides a summary of how i have filled the nodata voids in the dem data from the srtm, using. Two resolutions of finished grade srtm data are available through earthexplorer from the collection held in the usgs eros archive. Input gdem was rejected if more than 80 m different from srtm. These voids were filled by a 33 matrix with the mean value zero values were ignored. To give an idea, how many areas are affected by the voids. Global multiresolution terrain elevation data 2010 gmted2010. Shuttle radar topography mission srtm data products and non published srtm for canada source for northern canada and void filling. Srtm digital elevation data 30m earth engine data catalog.
The new srtm data are released at the version 3 processing level, which have been void filled. Africa dem data for all of africa can be downloaded via the world coverage map. Dec 03, 2014 srtm data have been publicly available relatively soon after the data was processed. Global multiresolution terrain elevation data 2010.
The nasa shuttle radar topographic mission srtm has provided digital elevation data dems for over 80% of the globe. Since november 2012 there is free and global coverage at 3 arc seconds available. The srtm void filled data set are the result of this additional processing. Download here the evaluation version and if you wish the corrected n46e009 srtm tile. Shuttle radar topography mission srtm data access and application. They will be posted in stages, with most of africa and a portion of southern europe available as of this writing. 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. Digital elevation data with srtm voids filled using accurate. We define a void in the srtm dataset as an area over the landsurface, which contains nodata and is not a water body. 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. The glcf is also a convenient way to browse and download srtm data, in geotiff format for more information, see the glcf srtm page. Shuttle radar topography mission srtm data products and non published srtm for canada.
Input gdem was rejected if more than 80 m different from prism, unless input gdem num number pixel value was 3 or more. The main issue with gdem is artificial trash on the flat sands. The new model is called the global multiresolution terrain elevation data 2010, or gmted2010 for short. If youre interested in images and visualizations created from srtm data, go to the image product description page.
Shuttle radar topography mission srtm non void filled north of juneau, alaska. The process was performed 3 times inn order to eliminate all voids. These voids can be filled using a range of interpolation algorithms in conjunction with other sources of elevation data, but there is. Srtm elevation data of the earths land surface are available with data points posted every 1. Srtm data void filled national aeronautics and space administration applied remote sensing training program 12 gdex. Nasa shuttle radar topography mission srtm version 3. Srtm2osm tool uses shuttle radar topography mission. The version of the dataset available here is breakline emphasis, 7. These are the highest quality srtm data available to date. 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.
Digital elevation data with srtm voids filled using. The data are available for download via earthdata search, the lp. The data can be downloaded in the download srtm section under the open database license. Srtm data validation and applications srtm 1 arcsecond global void filled data tiles are available for download via usgs earthexplorer web site. 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. This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1.
An evaluation of voidfilling interpolation methods for. 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. Shuttle radar topography mission srtm data access and. An overview of the different versions is given in figure 2 in the srtm user guide. 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. Shuttle radar topography mission 1arc second global. Earthexplorer fgdc metadata srtm void filled srtm1n39w099v2. Note that the former contains ellipsoidal elevations and the later geoidal ones. Coverage map for srtm void fill data from linked coverage map of elevation data from. 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. 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. Srtmgl3 is the default 3arcsecond data for the world obtained by averaging the 1arcsecond raw data.
The tool writes contours as osm ways into an osm file. This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1 arcsecond approximately 30m. 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. Srtm data have been publicly available relatively soon after the data was processed. Global srtm at 30m resolution center for earth observation. In november 20 nasa released version 3 of the srtm data. Space shuttle radar topography mission several srtm data versions and products are available. Added download queue integration code to improve downloads times. These data had voids filled using other data sources such as the aster gdem2, gmted2010, and ned. Srtm 90m digital elevation database cgiar platform for big. 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. This suite of products at three different resolutions approximately 1,000, 500, and 250 meters is. This code also gives you hillshade, elevation palette, and sea mask. The provision of aster gdem version 2 by nasa and the japanese meti has helped to make this possible.
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. The voids occur in areas where the initial processing did not meet quality specifications. The shuttle radar topography mission srtm, see farr et al. Nasa has released version 2 of the shuttle radar topography mission digital topographic data also known as the finished version. The srtm digital elevation data, produced by nasa originally, is a major. As with daps srtm us elevation 30m dataset, the new srtm grids are provided in geosoft grid format. 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. International journal of geographical information science volume 21, issue 9, 2007. Srtm shuttle radar topography mission center for earth. Srtm consisted of a specially modified radar system that flew on board the space shuttle endeavour. Srtm plus uses srtm version 2 see below where the radar interferometric method was successful not void.
These data are only available at the usgs earth explorer site in one degree tiles. Data can be downloaded using a browser or accessed directly from the ftp site. The void filled srtm data from viewfinder panoramas are high quality at full srtm resolution. Mapping the earth the shuttle radar topography mission. It also happens to offer their version 4 srtm which has the gaps filled. Data for this version can be downloaded from this usgs directory page. Srtm 90m digital elevation database cgiar platform for. Asking for help, clarification, or responding to other answers. Shuttle radar topography mission srtm nonvoid filled. Srtm void filled digital object identifier doi number.
Thanks for contributing an answer to geographic information systems stack exchange. This work aims at providing an interactive interface to download 30m resolution dem for any country. Usgs earthexplorer hosts worldwide coverage of void filled data and provides open distribution of this highresolution global dataset. The global multiresolution terrain elevation data 2010 gmted2010 dataset contains elevation data for the globe collected from various sources. Jplnasa version 1 srtm nonvoid filled, unedited elevation data us. Unfortunately this data set contains significant gaps in the coverage. For small data voids, which account for the majority of holes hall et al. The srtm collections are located under the digital elevation category see picture at the end. Free world at 1 arc second resolution 30m radio mobile download site 1.
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. As with the version 2 data on the usgs site, these data are. Srtm2osm tool uses shuttle radar topography mission digital elevation model dem to generate elevation contours isohypses of a selected terrain. Srtm elevation data of the earths land surface are available with data points posted every 1 arc second for global coverage. The collections are located under the digital elevation category below the srtm subcategory. 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. The new data are available for download from the usgs eros data center see. An evaluation of voidfilling interpolation methods for srtm data. Traditionally, there are three types of methods to fill voids in dem like srtm, which are available in arcgis.
Shuttle radar topography mission srtm 3 product name version resolution coverage available from srtmgl30 2. If you want to download srtm data, those data are available at the us geological surveys eros data center for download. Incorporated changes in metadata to accommodate for the switch to landsat multimission datasets. Also note, that the freeware program dgterrain viewer comes with a free tool to join srtm tiles on a larger one.
Nasa shuttle radar topography mission srtm v3 global 1 arc second. Dec 27, 2017 srtm void filled level 2 added to the list of available datasets. 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. Shuttle radar topography mission srtm void filled usgs. Height data from these sites or data files in the same formats are supported. Without the publication of aster gdem version 2, the task of filling the large srtm desert voids would have taken considerably longer. This article presents a new technique for filling voids in srtm dem data. A method to fill voids uses a variety of interpolators. Filling the voids in the srtm elevation model a tin. 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. 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.
180 349 803 89 945 1082 817 1351 1610 533 782 324 1370 1020 1574 40 1541 1178 1181 1481 534 35 217 630 971 403 38 713 952 1268 729 250 84 735 537 618 1104 1155 843 1339 1311