The grid cells are spaced at regular intervals along south to north profiles that are ordered from west to east. Digital chart of the world dcw and digital terrain elevation data dted. Its a 30m dem derived from stereo imagery of aster data. Geological survey, no warranty, expressed or implied, is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. Here you can download the gdem v2 which is an improvement over the original gdem data. Gtopo30 was derived from several raster and vector sources of topographic information. The whole image can be viewed only with windows95 or windowsnt. Opendem the portal for sharing free digital elevation models and xyz height datasets. The 3dep data holdings serve as the elevation layer of the national map, and provide foundational elevation information for earth.
The elevation layers distributed with hydrosheds are based on a combination of the original srtm3 and dted1 elevation models of srtm for further specifications see 2. Nasa jpl, and most recently, the alos global digital surface model aw3d30. Digital elevation models and gis for watershed modelling. This choice of shading captures the deeper parts of the world oceans, the himalayas, rockies, and the andies, and shows that much of antarctica is a high plateau. Download free and lossless lidar compression data wikipedia national lidar dataset wikipedia national lidar dataset united states arcgis opendata catalog.
Data for the whole african continent is available and both digital surface and terrain models can be delivered on request. This report describes the history of the globe project, the candidate data sets, data compilation techniques, organization, and use of the data base. Until now, elevation data for the continent of africa were freely available to the public only at 90meter resolution. Digital elevation data for the entire globe now available on the cgiarcsi geoportal. Gtopo30 is a global digital elevation model dem resulting from a collaborative effort led by the staff at the u. The stellenbosch university digital elevation model sudem is a 5 m resolution digital elevation model dem a database of height above mean sea level records representing the earths surface. Gtopo30 is a global digital elevation model dem produced by the u. More and more dem data sets are published under free licenses or as public domain. Version 3 of the aster global digital elevation model.
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. Home products 2 m digital elevation model of south africa demsa2 accurate and detailed elevation height above sea level data are critically important for many applications including construction planning e. 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. The srtm instrument consisted of the spaceborne imaging radarc sirc hardware set modi. A spot dem is a digital elevation model produced by automatic correlation of stereopairs acquired by the high resolution stereoscopy hrs instrument on spot 5. Buy digital elevation model dem data intermap nextmap. Digital elevation data with srtm voids filled using accurate. Also, it covers most of the world with absolute vertical height accuracy of less than 16m. In data sparse regions such as subsaharan africa, hydraulic flood modelling applications are limited to the use of mediumresolution 30 m digital elevation models dems including the shuttle radar topography mission srtm. Lidar point cloud data is also available over many areas of the us. Digital elevation model technologies and applications.
This color shaded relief image shows the extent of srtm digital elevation data for africa. Earth, moon, or asteroid created from a terrains elevation data. The africa 30 arc second dem was developed using commercially available geographic information system software, vectortoraster gridding software, and utilities developed specifically for this project. May 6, 2020 this is a tiled collection of the 3d elevation program 3dep and is one meter resolution. This dataset contains the digital elevation model dem for africa from the hydrologic derivatives for. Aster gdem boasted a global resolution of 90 meters with a resolution of 30 meters in the united states.
This dataset was derived through mosaicking of individual srtm tiles for a particular country and clipping the mosaicked tiles using the country boundary extent. Geographical information systems gis and digital elevation models dem can be used to perform many geospatial and hydrological modelling including drainage and watershed delineation, flood prediction and physical development studies of urban and rural settlements. The datasets being released today and during the course of the next year resolve to 30meters and will be used worldwide to improve environmental monitoring, climate change research, and local decision support. Download free dem digital elevation model 10 meters by. Nrcs is a member agency of the national digital elevation program. We are descending toward mount kilimanjaro, which is high enough to have glaciers, even though it is just south of the equator. The topographic maps and geographical information system gis data provided in the national map are pregenerated into downloadable products often available in multiple formats.
The 3rd edition of the dem users manual includes 15 chapters and three appendices. Without the publication of aster gdem version 2, the. 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 single pixel errors. Open in map open in map recommended by tara starr marvin. This data represents the 30 meters digital elevation model dem from shuttle radar topography mission srtm. A digital elevation model dem is a 3d cg representation of a terrains surface commonly of a planet e. The distribution files have the number of the processing unit appended to the end of the zip file name e. Digital elevation models dems, orthoimagery, and land cover. Enhancing digital elevation models for hydraulic modelling. Srtm data, in hgt format, can be downloaded from here, but for some mountain and desert. Digital elevation model dem from the hydrologic derivatives for. Intermaps 3d foundation data layers provide the framework necessary for governments and business to make informed decisions and find intelligent solutions to their planning challenges. Geological survey usgs with a horizontal grid spacing of 30 arc seconds approximately 900 meters. Digital elevation data with srtm voids filled using.
The usgs acquires bareearth elevation source data through. Elevation data at the highest possible resolution from nasas srtm mission in february 2000 are being released for the first time for most of the african continent. High resolution free dem data released for africa igis. See our dataset list for a brief explanation of these products. Free satellite data, satellite imagery, digital elevation models dems, topographic maps and free software links. As part of this project emerged the aster global digital elevation model gdem. 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. Free digital elevation model dem and free satellite data.
We have used that data for contours and hillshades for community basemap in africa. 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. Available for anywhere in south africa 35cm mean vertical error. Full coverage of south africa via 1,950 national 1. High quality digital elevation data will support the agency business activities by improving employee effectiveness and efficiency in providing assistance to our customers through the use of digital elevation models dem, hillshade, slope, and contour map and data products.
Buy and download digital terrain model dtm and digital surface model dsm data for you custom area of interest or subscribe to online access of large areas via open geospatial consortium ogc compatible web map service wms and web coverage servicewcs. The srtm dems have a resolution of 90m, and are provided in 5 deg x 5 deg tiles for easy download and use. Central african republic elevation model humanitarian data. Free arcgis gis shapefile maps geospatial data for digital. The shuttle radar topography mission produced the first detailed elevation model of most of the world.
Keywords, digital elevation model, african water resource database. Space images srtm data release for africa, colored height. This dataset was derived through mosaicking of individual srtm tiles for a particular country and clipping the mosaicked tiles. The data could be downloaded under the open database license the data could be visualised in 3d with the virtual terrain software srtm digital terrain model of germany. The file contains the digital elevation model in ascii raster format 10m grid. Download srtm 30m digital elevation models for free. This dataset contains the digital elevation model dem for africa from the hydrologic derivatives for modeling and analysis hdma database.
Forms part of stellenbosch university digital elevation model sudem 1m resolution dsms also available on request digital terrain model dtm also available at 2m resolution. Geonetwork the portal to spatial data and information. The cgiarcsi is now able to provide holefilled seamless srtm 90mdigital elevation data for almost the entire globe for download. The dem data were developed and distributed by processing units. Download digital elevation model dem 10 meters for arcgis duration. Our comprehensive elevation suite offers some of the most homogenous imagery and accurate elevation products on the market. Nasa and japans joint operation was the birth of advanced spaceborne thermal emission and reflection radiometer aster. Abdoulaye dieye updated the dataset cameroon digital elevation model over 4 years ago. Maps and gis data are available for digital download. Africa dem data for all of africa can be downloaded via the world coverage map. A digital elevation model for the african continent ee publishers. Nasa has released version 2 of the shuttle radar topography mission digital topographic data also known as the finished version. Nodata voids have been filled using interpolation algorithms, and the data has been clipped at the ocean shoreline.
Elevation data in netcdf 1degree latitudelongitude resolution elevations, light shading for elevations 5000m, and increasingly darker shades for elevations 0 and 1500m. Cameroon digital elevation model humanitarian data. Unlike a digital terrain model dtm, which describes the distribution of terrain or bare earth heights, a dem includes first surface elevations with vegetation and manmade structures. A global dem refers to a discrete global grid dems are used often in geographic information systems, and are the most common basis for digitally produced relief maps.
1175 1314 388 1097 528 1247 990 226 1279 1432 198 1375 708 286 1412 1238 273 907 1492 156 63 1366 57 936 378 599 3 948 1693 155 1337 1683 1515 148 833 215 313 854 938 684 1424 290 620 619 48 1121 1260 284 124