All are produced from a seamless dataset to allow easy mosaicing. The difference in elevation, when compared to a bare earth dem is assigned to the. Digital elevation model dem is a raster image that holds z values, it is used widely during the analysis process where surface height value are important. The metric correspondence of this value is latitude dependent and roughly equals 30m x 30m. Any downloading and use of these data signifies a users. What is the vertical resolutionaccuracy of global srtm 1 arc. In this paper include the dem data produced by the shuttle radar topography mission srtm data, where tested and evaluation dem data for an area of 100 square kilometers in iraq thiqar. Download digital elevation model dem 10 meters for arcgis duration. Digital elevation models dem for the entire globe, covering all of the countries of the world, are available for download on this site. Fourth, analysing the accuracy of dem derived terrain attributes such as slope and drainage network.
The shuttle radar topography mission srtm, see farr et al. Following is a brief discussion of the comparison of two data sources that can be used for defining the flood inundation effects. Also, it covers most of the world with absolute vertical height accuracy of less than 16m. Since then the schedule was accelerated, and all global srtm data have been released. Eudem for its vertical accuracy and to compare it with srtm dem and. Srtm was the primary and virtually only payload on the sts99 mission of the space shuttle endeavour, which launched february 11, 2000 and. Accuracy assessment of the processed srtmbased elevation. Accuracy assessment of the processed srtmbased elevation data. The data can be downloaded in the download srtm section under the open database license. The shuttle radar topography mission srtm is a joint project between nasa and nga national geospatial. Digital elevation model was downloaded and adapted as produced. Geoscience australia, 1 second srtm digital elevation model. Which dem data is better for elevation mapping, aster or srtm satellite data.
Voustianiouk b a center for international earth science information network ciesin, columbia university, 61 rt 9w, po box, palisades, ny 10964, usa. In rainforest basins, such as the amazon, the influence of vegetation on srtm accuracy is particularly pronounced. 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. Digital elevation models on accuracy validation and bias. The srtm 90m dem s have a resolution of 90m at the equator, and are provided in mosaiced 5 deg x 5 deg tiles for easy download and use. Thus, the ned has higher accuracy than the srtm data at shorter wavelengths. The 1 second dsm, dem, dems and demh are national elevation data products derived from the shuttle radar topography mission srtm. The processed srtm 90 m digital elevation model dem for the entire globe. 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.
However, according to, the accuracy of srtm is better than that from aster. The new data are available for download from the usgs eros data center see. But heres a usgs earth explorer download guide to help you get started. Pdf vertical accuracy of digital elevation model from shuttle. This dataset provides a userguide and setup information relating to accessing the gescience australia, 1 second srtm digital elevation model dem, for visualisation and analysis using esri. Download srtm 30m digital elevation models for free. Can some one provide a link on which i can download dem files, especially for uganda. The srtm mission mapped the structure of the earth. Gisat offers srtm dem products fulfilling customer specific requirements e. Makinanosantillana,b a csu phillidar 1 project, caraga center for geoinformatics. In the case of using srtm or aster dem, the expected vertical accuracy is about 16 m. Each of these steps might be a source of errors 12. Accuracy and resolution of shuttle radar topography mission data bridget smith and david sandwell igpp, scripps institution of oceanography, usa. This paper compares the accuracy of advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem, shuttle radar topography mission srtm cband and german aerospace centre dlrsrtm xband digital elevation models dems with the ziyuan 3 zy3 stereoscopic dem and ground control points gcps.
These 1 second products are a significant improvement on the shuttle radar topographic mission srtm digital surface model dsm from which they were derived. Assuming that london is located at approximately 51. Srtm plus uses srtm version 2 see below where the radar interferometric method was successful not void. What is the vertical resolutionaccuracy of global srtm 1. Jun 07, 2011 this is a howto to demonstrate the creation of first and second order derivatives in arcmap using srtm 3 data. Arcticdem arcticdem is an ngansf publicprivate initiative to automatically produce a highresolution, high quality, digital surface model dsm of the arctic using optical stereo imagery, highperformance computing, and open source photogrammetry software. According to errors can be classified into gross errors, systematic errors, and random errors.
Aster and srtm are two possible sources for dem covering the whole country. There is no guarantee of warranty concerning the accuracy of these data. The shuttle radar topography missiona new class of digital elevation models acquired by spaceborne radar isprs journal of photogrammetry and remote sensing. Digital elevation model dem, smoothed dem dems and hydrologically enforced dem demh. Makinanosantillana,b a csu phillidar 1 project, caraga center for geoinformatics college of engineering and information technology, caraga state university. Current research is the first study to investigate the accuracy of freely distributed dems aster and srtm for najran district, ksa. Opendem the portal for sharing free digital elevation models and xyz height datasets. Comparison in terms of accuracy of dems extracted from. Srtm vegetation removal and hydrodynamic modeling accuracy. Evaluation of vertical accuracy of open source digital. Geological survey national elevation dataset, and comparison with other largearea elevation datasets srtm and aster. Srtm 1 1 equals 1 arcsecond, whereas 3 was indicating the 3 arcsecond a. Geoscience australia, 1 second srtm digital elevation.
As everybody is aware that z or elevation values are expensive to obtain, so i have listed few places on internet where you can download the world dem data for free. The horizontal relation between the reference dem and the srtm height data have been determined after datum transformation by an adjustment of shift parameters separately for subareas indicating also the horizontal accuracy of the srtm data. Under the data sets tab, select digital elevation srtm srtm 1arcsecond global. Elevation data digital elevation models l3harris geospatial. More info including download links can be found at usgs eros data center. The elevations in this dem represent the topographic bareearth surface. Onemeter dem surfaces are seamless within collection projects, but, not necessarily seamless across projects. The srtm elevation data for the study area was downloaded from. A reference digital elevation model dem, produced from contour lines digitization, from topographic maps at scale 1.
Shuttle radar topography mission srtm the srtm mission began in 2000 as a joint venture between nasa and nga to use a modified radar system onboard the space shuttle endeavour to acquire reflective surface elevation data for over 80 percent of the earths land mass. 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. The accuracy of the dem has been shown to be a first. Usgs standard onemeter dems are produced exclusively from high resolution light detection and ranging lidar source data of onemeter or higher resolution. 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. This dataset provides a userguide and setup information relating to accessing the gescience australia, 1 second srtm digital elevation model dem, for visualisation and analysis using esri arcmap and arccatalog. As part of aster digital elevation model dem accuracy evaluation efforts by the usjapan aster science team, stereo image data for four study sites around the world have been employed to validate prelaunch estimates of. The shuttle radar topography mission srtm, dts99 from february 11 to 22, 2000 was an usgermanitalian effort to produce a first global digital elevation model dem. In this study, geometric accuracy and morphological analyses of the gtopo30 and interferometric dems derived from the c and x bandsar systems have been carried out over the istanbul testfield with undulating terrain and moderate height range using the reference dem digitized from the topographic maps of 1. Elevation data l3harris geospatial offers a wide variety of inhouse digital elevation datasets and has partnered with other leading topography providers such as airbus and planetobserver to provide multiresolution digital elevation models dem coverage of earth. The national 1 second 30m dems suite contains three publicly released national models.
This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1 arcsecond approximately 30m. Elevation30 is a unique worldwide 3d geographic reference database specifically designed for large area coverage, addressing mapping, gis and military needs. Dem has a higher accuracy than the 90 m dem, cband data rabus etal. The ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa jointly announced the release of the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model version 3 gdem 003, and the aster water body dataset astwbd on.
Srtm dem downloaded from the cgiarcsi jarvis et al. Apr 27, 2017 how to download free dem digital elevation model, you can also downlaod sentinel 1a data and sentinel 1b link. Therefore, the main objective of this study was to assess the accuracy of the srtm cband version 4 dem and srtm xband dem of mountainous areas located in poland and to examine the quality of data in relation to topographic parameters, radar beam geometry, initial voids in data and the presence of forest cover. Openstreetmap data was used to correct the height values for forested and built up areas. There is no guarantee of warranty concerning the accuracy of. Vertical accuracy assessment of srtm cband dem data for. The usgs acquires bareearth elevation source data through. Usgs digital elevation models dems are arrays of regularly spaced elevation values referenced horizontally either to a universal transverse mercator utm projection or to a geographic coordinate system. Digital elevation data with srtm voids filled using accurate. Usgs dem digitatal elevation model elevation data and.
There are 2 ways that srtm data can be used with pathloss 5. The dem should be used for the orthorectification of high resolution images and other applications such as slope map creation, environmental planning et. Srtm dem data is being housed on the usgs earth explorer. For a description of the project, see the nasajpl srtm site. As the orbit of the shuttle was not circumpolar but sinusoidal it was only possible to cover a small portion of the earth surface. Click on the srtm30 tile to download the digital elevation map dem from the place you select.
How can i download srtm data of 30 m resolution for research in remote sensing. Mar 15, 2017 digital elevation model dem is a raster image that holds z values, it is used widely during the analysis process where surface height value are important. For more information on the release history of the srtm xsar dem see chapter download the srtm xsar 10 regional mosaics. Which dem data is better for elevation mapping, aster or srtm. The shuttle radar topography mission srtm data were collected with a sophisticated synthetic aperture radar sar system with a pair of c and. One pixel of the srtm xsar dem has a resolution of 1 x 1 arcsecond on the ground.
Elevation provides easy download, cache and access of the global datasets srtm 30m global 1 arc second v003 elaborated by nasa and nga hosted on amazon s3 and srtm 90m digital elevation database v4. The data can be downloaded in the download srtm section under the open database license or ccbysa license. Lidar li ght d etection a nd r anging elevation data. Pdf vertical accuracy assessment for srtm and aster. Vertical accuracy assessment for srtm and aster digital. The grid cells are spaced at regular intervals along south to north profiles that are ordered from west to east. Dec 24, 2015 digital elevation model dem is used to represent the terrain of the earth. Digital elevation shuttle radar topography mission srtm usgs.
Learn how easy it is to search and download freely available shuttle radar topographic mission srtm dems, that were collected in february 2000 in a special joint mission onboard sts99, using x. We would like to show you a description here but the site wont allow us. A free provided dems are the 10 m dem produced by the geographical survey institute of japan gsi dem, advanced space borne thermal emission and reflection radiometerglobal dem, shuttle radar topography mission, global multiresolution terrain elevation data 2010, hydrological. We are all excited about the recent message from the white house. Oct 18, 2007 in the frame of that project there is need for a high accuracy dem covering the whole country. On a recent afternoon, i challenged a friend to a data download duel. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Global srtm data at a resolution of 1 arcsecond have been edited to. Home data sources 5 free global dem data sources digital elevation models. Accuracy assessment of the processed srtmbased elevation data by cgiar using field data from usa and thailand and its relation to the terrain characteristics y. Assessment of the accuracy of srtm c and xband high. Comparison in terms of accuracy of dems extracted from srtm xsar data and srtm csar data. What is the vertical resolutionaccuracy of global srtm 1 arc second 30 m.
How can i download srtm data of 30 m resolution for research in. Assessing the accuracy of srtm dem and aster gdem datasets for the coastal zone of shandong province, eastern china. Accuracy and resolution of shuttle radar topography. European digital elevation model validation against. Analysisof theaccuracy of shuttleradar topography mission.
The ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa jointly announced the release of the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model version 3 gdem 003, and the aster. Voidfilled srtm plus released srtm nasa v3 nasa has released a voidfilled version of the shuttle radar topography mission digital elevation model, known as srtm plus or srtm nasa version 3. Digital elevation model dem, smoothed dem dem s and hydrologically enforced dem dem h. Assessing the accuracy of srtm dem and aster gdem datasets. Accuracy assessment of the processed srtm based elevation data by cgiar using field data from usa and thailand and its relation to the terrain characteristics y. When i download srtm data for london, uk i should be getting 3 arcsecond resolution. A free provided dems are the 10 m dem produced by the geographical survey institute of japan gsidem, advanced space borne thermal emission and reflection radiometerglobal dem, shuttle radar topography mission, global multiresolution terrain elevation data 2010, hydrological data and maps based on shuttle.
Evaluating srtm and aster dem accuracy for the broader area. 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. The reasons for that may be the accuracy of both aster and srtm dem depends on the region that you are interested and its terrain type. This collaboration aims to generate a nearglobal digital elevation model dem of earth using radar interferometry. Derived from optical satellite data, merged with radar data especially over cloudy areas, elevation30 features greater coverage independent of terrain characteristics and weather conditions. Vertical accuracy assessment of srtm cband dem data for different terrain characteristics r. Srtm dem is available free of charge via ftp or on cddvd service charged. Sts99 shuttle endeavour srtm was a single payload mission shuttle travelled tail forward at 7.
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