A comprehensive accuracy assessment of the geextracted elevation. The national aeronautics and space administration nasa and the national geospatial. Werner, 2001 and became accessible for free download over the internet. The shuttle radar topography mission srtm, see farr et al. This aster product is available at no charge for any user pursuant to an agreement between meti and nasa. Analyses presented in this paper indicate that the absolute vertical accuracy of srtm ver3 data for our datasets proven to be two to three. What is the vertical resolutionaccuracy of global srtm 1. We assess the accuracy and resolution of topography data provided by the shuttle radar topography mission srtm through spectral comparisons with the national elevation dataset ned and a high. A more extensive analysis of the srtm dgps data indicates that it meets the absolute and relative accuracy. Digital elevation data with srtm voids filled using accurate.
Usgs eros archive digital elevation srtm mission summary. Usgs eros archive digital elevation shuttle radar topography. I read about the new version of the digital elevation model at 30 meters srtm 30 meters, but i can not find from were i can download it. 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. Srtm digital elevation data 30m earth engine data catalog. Roadway elevation data is critical for a variety of transportation analyses. In the case of using srtm or aster dem, the expected vertical accuracy is about 16 m. However, it has been challenging to obtain such data and most roadway gis databases do not have them.
The srtm elevation data for the study area was downloaded from. Voustianiouk b a center for international earth science information network ciesin, columbia university, 61 rt 9w, po box, palisades, ny 10964, usa. On september 23, 2014, the white house announced that the highestresolution topographic data generated from nasas shuttle radar topography mission srtm in 2000 was to be released globally by late 2015. Apr 19, 2019 derek watkins has created a simple and easy to use interface for downloading 30meter srtm data. Jul 16, 2018 the accuracy of srtm data can range from 5 to 10 meter, depending on where you are. Makinanosantillana,b a csu phillidar 1 project, caraga center for geoinformatics. May 27, 2015 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. 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 shuttle radar topography mission srtm wikipedia article is a nasa mission conducted in 2000 to obtain elevation data for most of the world.
Opendem the portal for sharing free digital elevation models and xyz height datasets download srtm data the data could be downloaded under the open database license. The dem data on this site are version 3 of the csisrtm data with included. How can i download srtm data of 30 m resolution for research in remote sensing. Accuracy assessment of the processed srtmbased elevation data. Pdf srtm data is still one of the most used data in geosciences for various purposes. The gdem and astwbd are available for download from nasa earthdata and japan space systems. There is a new, 30 meters resolution srtm dtm coming out. For the study area, the 30 m srtm elevation data featured a much greater absolute vertical accuracy than the absolute vertical accuracy value of 16 m published in the srtm data specification. All accuracies are quoted at the 90% level, consistent with.
Google earth elevation data extraction and accuracy. Openstreetmap data was used to correct the height values for forested and built up areas. Accuracy and resolution of shuttle radar topography mission data. Vertical accuracy assessment for srtm and aster digital. In support of military applications, the national geospatialintelligence agency nga has developed standard digital datasets digital terrain elevation data dted which is a uniform matrix of terrain elevation values which provides basic quantitative data for systems and applications that require terrain elevation, slope, andor surface. Pdf accuracy and resolution of shuttle radar topography. For more information about the gdem, see the validation report. What is the vertical resolutionaccuracy of global srtm 1 arc. 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. Produce digital topographic map products which meet interferometric terrain height data ithd2 specifications 30 m x 30 m spatial sampling with 16 m absolute vertical height accuracy, 10 m relative vertical height accuracy and 20 m absolute horizontal circular accuracy. Purpose this document provides a description of the content, format and accuracy specifications of the shuttle radar topography mission water body data swbd.
We would like to show you a description here but the site wont allow us. The srtm mission mapped the structure of the earth. There is no guarantee of warranty concerning the accuracy of these data. In malaysia, the vertical accuracy both absolute and relative stands at between.
The actual data is the 90m data set, it is just resampled if you pull it down at 45m. Accuracy assessment of the processed srtmbased elevation. As stated on the nasa jpl official page, the next release is planned for later in 2014, and it is expected to include all of south america plus north. Prior to release of the aster data, srtm was the one of the free dem available on the market. Pdf assessing the accuracy of srtm altitude data for the hilly. The shuttle radar topography mission srtm provides for the first time a near global highresolution digital elevation model dem with great advantages of.
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. Analysisof theaccuracy of shuttleradar topography mission. The data can be downloaded in the download srtm section under the open database license or ccbysa license. Download 30meter srtm data easily with this point and click. The accuracy of the gps data used to assess srtm data should directly impact the result. There is also a study on the accuracy of different global. Arranged in tiles that are 1 degree latitude by 1 degree longitude, shuttle radar topography mission srtm data was acquired over a 11day mission in february 2000. Hence, it is important to understand the level of accuracy of the gps data used to validate the srtm data and work out an optimal way of using the data. These files are available for download in both arcinfo ascii format, and as. Natural earth data is number 2 on the list because it best suits the needs of cartographers. They reported that the srtm mission specifications for absolute and relative height errors for the gps ground control point targets were exceeded. Vertical accuracy assessment for srtm and aster digital elevation models. 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.
Also, it covers most of the world with absolute vertical height accuracy of less than 16m. Accuracy assessment of the tandemx 90 digital elevation. Since then, they were described in details farr and. Database search, data display, and download programming were implemented by genesiis software.
It is the current dataset of choice for digital elevation model dem data since it has a fairly high resolution 1 arcsecond, or around 25 meters, has nearglobal coverage from 56s to 60n, and is in the public domain. The shuttle radar topography mission srtm was flown aboard the space shuttle endeavour february 1122, 2000. It also happens to offer their version 4 srtm which has the gaps filled. The raster datasets also provide beautiful hillshade relief for your map. Data were produced by nasa from radar data collected by the shuttle radar topography mission in february 2000. The 45m level happens to be the highest resolution layer available from the wms server that the srtm data comes from. The glcf is also a convenient way to browse and download srtm data, in geotiff format for more information, see the glcf srtm page. Assessing the accuracy of srtm altitude data for the hilly area in northeastern romania.
The data can be downloaded in the download srtm section under the open database license. There are different places where you can download the aster dem, first is lp daac global data explorer and next is nasa reverb. This srtm v3 product srtm plus is provided by nasa jpl at a resolution of 1 arcsecond approximately 30m. Srtm water bodies south east, one of six data sets represents the lakes, rivers, and ocean areas within the srtm coverage area between 60 degrees north and 56. The best part is natural earth data is in public domain. Access digital elevation data about australias landforms and seabed, which is crucial for addressing the impacts of climate change, disaster management, water security, environmental management, urban planning and infrastructure design. Many thanks to cgnet for hosting the database and tech support. Geodata 9 second dem version 3 geoscience australia, 2008 used to fill voids. What is the vertical resolutionaccuracy of global srtm 1 arc second 30 m srtm. 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.
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