Terrain data description fao soils portal food and. Ned is designed to provide national elevation data in a seamless form with consistent datums, elevation unit, and coordinate reference system. Detailed information on the characteristics of gtopo30 including the data distribution format, the data sources, production methods, accuracy, and hints for users, is found in the gtopo30 readme file. The time required to complete this information collection is estimated to average 2 minutes per response. Background information about our remote sensing data is provided here, including collection overview, instrument specifications, and workflow examples. Registered users have access to more features than guests do. Geological survey usgs with a horizontal grid spacing of 30 arc seconds. Find and download geospatial raster data using resources such as the ones in these tables. It has not the greatest resolution, approximately 1 km and split into 33 tiles available in usgs dem file format. Gtopo30 is a global digital elevation model dem resulting from a collaborative effort led by the staff at the u.
Gtopo30 was derived from several raster and vector sources of topographic information. These data were by developed by the usgs eros data center in 1996 from a variety of data sources. Gtopo30 is a global digital elevation model dem with a horizontal grid. Geological surveys eros data center with funding or data contributions from the national aeronautics and space administration nasa, the united nations environment programmeglobal resource information database, the u. Please be sure to check the gtopo30 frequently asked questions for further information, or if you are having difficulties viewing the data. The data are collected and compiled every five years for each state, the district of columbia, puerto rico, and the u. Landsat 7 enhanced thematic mapper plus collection 1 level1. Geological survey maintains national data bases of wateruse information. A global hydrologic database derived from 1996 gtopo30 data.
Hydro1k is a geographic database developed to provide comprehensive and consistent global coverage. Gmted2010 is a suite of seven raster data products. The 3dem application produces three dimensional terrain scenes and flyby animations from a wide variety of freely available data sources including. The original data can be downloaded from the gtopo30 home page. Comments from users of gtopo30 are welcomed and encouraged. Geological survey usgs with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. For more information about the data you are downloading, including documentation and how to properly cite the data, please visit usgs. Dec 27, 2017 the default data set option is added to the general preferences section. Vs30 models and data usgs earthquake hazard program. Geological surveys eros data center in sioux falls, south dakota. Geological survey usgs for use by the usgs in fulfilling its mission. Usgs digital elevation model ascii dem files usgs spatial data transfer standard sdts dem files nasa shuttle radar topography mission srtm files lidar point cloud las files usgs global 30 arc. Although this software program has been used by the u.
Download srtm 30m digital elevation models for free. Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the. The software can be used, copied, modified, and distributed without any fee or cost. Download data or browse the data in an interactive map. Since the time gtopo30 was completed, higher quality elevation data has become available, due to new data sources. Gtopo30 is a global raster digital elevation model dem providing terrain elevation data with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. Asas nasas advanced solidstate array spectroradiometer. Background on the gtopo30 data set the gtopo30 data set, completed in 1996, was developed by the u. The national elevation dataset ned is a raster product assembled by the u. Gtopo30 is a global digital elevation model dem with a. 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. Learn how easy it is to search and download freely available shuttle radar topographic mission srtm dems, that were collected in february 2000. The software and related documentation on these web pages were developed by the u.
November 5, 2019 hydro1k is a geographic database developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams, drainage basins and ancillary layers derived from the usgs 30 arcsecond digital elevation model of the world gtopo30. It is a digital elevation model for whole world created and distributed by usgs. The software is provided as a minimum in source code form as. Digital elevation data extracted from the gtopo30 dataset. When the predefined layers is enabled, the configure layer icon is added allowing a displays option to position the system and user defined wms layers above or below the scene imagery. Coverage maps indicating the availability of hydro1k products are available for download. Click on the srtm30 tile to download the digital elevation map dem from the place you select.
We will not distribute responses associated with you as an individual. Gtopo30 is a global raster digital elevation model dem providing terrain elevation data with a horizontal grid spacing of 30 arc seconds approximately 1. The srtm data is publicly available as 3 arc second approximately 90 meters resolution at the equator dems cgiarcsi, 2006. Global 1km digital raster data derived from a variety of sources. For latitudes over 60 degrees north elevation data from gtopo30 usgs, 2002 with a resolution of 30 arcseconds depending on latitude this is approximately a 1 by 1 km cell size were used. Webgis free terrain data geographic information systems. Earth explorer can be used to download the data, it is under the digital elevation category. Usgs eros archive digital elevation global 30 arcsecond. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. Hydro1k is a geographic database developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams, drainage basins and ancillary layers derived from the usgs 30 arcsecond digital elevation model of the world gtopo30. Hydrosheds is a mapping product that provides hydrographic information for regional and globalscale applications in a consistent format. Click the usgs gtopo30 link in the related information section to download a gtopo30 dem. A pentium class pc with 64 mb of ram and 120 mb of free hard drive space, an internet connection, arcview gis 3. Geological survey usgs, no warranty, expressed or implied, is made by the usgs or the u.
Download and convert gtop30 dem data from the usgs site and convert and process this data. To be removed read 30arcsecond global digital elevation. Nov 30, 2011 this new elevation data called global multiresolution terrain elevation data 2010 gmted2010, replaces the thirty year old gtopo30 terrain model. They include data from nasas srtm digital topographic data, gtopo30 and aster global dems, as well as lidar and other radar data. Gtopo30 was developed to meet the needs of the geospatial data user community for regional and continental. For more information about the data you are downloading, including documentation and how to properly cite the data, please visit parent directory page. Query and order satellite images, aerial photographs, and cartographic products through the u.
The usgs earth explorer is a similar tool to the usgs global visualization viewer glovis in that users search catalogs of satellite and aerial imagery usgs. Description z,refvec gtopo30tilename reads the gtopo30 tile specified by tilename and returns the result as a regular data grid. National geospatialintelligence agency nga have compiled an enhanced global elevation model named the global multiresolution terrain elevation data 2010 gmted2010 that replaces gtopo30 dataset. For easier distribution, gtopo30 has been divided into tiles. Default data set determines which data sets to use when first loading glovis next. The lp daac is located at the usgs earth resources observation and science eros center in sioux falls, south dakota. Gtopo30 is a global digital elevation model dem produced by the u. Gtopo30 is a global data set covering the full extent of. These data were by developed by the usgs eros data center in 1996 from a.
If you plan on using earthexplorer frequently, you may wish to register. For easier distribution, gtopo30 has been divided into tiles which can be selected. It offers a suite of georeferenced data sets vector and raster at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. Elevations in gtopo30 are regularly spaced at 30arc seconds approximately 1 kilometer. Usgs eros archive global 30 arcsecond elevation gtopo30. The land processes distributed active archive center lp daac is one of several disciplinespecific data centers within the nasa earth observing system data and information system eosdis. The ned assembly process involves edge matching and mosaicking elevation data into ned layers.558 509 227 545 1498 1135 277 1370 850 970 1515 1303 1055 1170 32 1432 1537 1504 859 175 1268 246 1187 1077 1142 921 1122 1486 95 334