A pentium class pc with 64 mb of ram and 120 mb of free hard drive space, an internet connection, arcview gis 3. 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. 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. Find and download geospatial raster data using resources such as the ones in these tables. 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. Gmted2010 is a suite of seven raster data products. Digital elevation data extracted from the gtopo30 dataset. Vs30 models and data usgs earthquake hazard program. These data were by developed by the usgs eros data center in 1996 from a. Dec 27, 2017 the default data set option is added to the general preferences section. The data are collected and compiled every five years for each state, the district of columbia, puerto rico, and the u. Background on the gtopo30 data set the gtopo30 data set, completed in 1996, was developed by the u.
Click the usgs gtopo30 link in the related information section to download a gtopo30 dem. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. Gtopo30 was developed to meet the needs of the geospatial data user community for regional and continental. 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. 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. Global 1km digital raster data derived from a variety of sources. Asas nasas advanced solidstate array spectroradiometer. National geospatialintelligence agency nga have compiled an enhanced global elevation model named the global multiresolution terrain elevation data 2010 gmted2010 that replaces gtopo30 dataset. Gtopo30 is a global raster digital elevation model dem providing terrain elevation data with a horizontal grid spacing of 30 arc seconds approximately 1. Registered users have access to more features than guests do.
Learn how easy it is to search and download freely available shuttle radar topographic mission srtm dems, that were collected in february 2000. Geological survey usgs, no warranty, expressed or implied, is made by the usgs or the u. Comments from users of gtopo30 are welcomed and encouraged. Geological survey maintains national data bases of wateruse information. The 3dem application produces three dimensional terrain scenes and flyby animations from a wide variety of freely available data sources including. Ned is designed to provide national elevation data in a seamless form with consistent datums, elevation unit, and coordinate reference system. Download data or browse the data in an interactive map. A global hydrologic database derived from 1996 gtopo30 data. It offers a suite of georeferenced data sets vector and raster at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. Gtopo30 is a global data set covering the full extent of. 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.
Usgs eros archive global 30 arcsecond elevation gtopo30. Query and order satellite images, aerial photographs, and cartographic products through the u. Since the time gtopo30 was completed, higher quality elevation data has become available, due to new data sources. Usgs eros archive digital elevation global 30 arcsecond. The software can be used, copied, modified, and distributed without any fee or cost. It is a digital elevation model for whole world created and distributed by usgs. They include data from nasas srtm digital topographic data, gtopo30 and aster global dems, as well as lidar and other radar data. Click on the srtm30 tile to download the digital elevation map dem from the place you select. Download and convert gtop30 dem data from the usgs site and convert and process this data. The ned assembly process involves edge matching and mosaicking elevation data into ned layers. The lp daac is located at the usgs earth resources observation and science eros center in sioux falls, south dakota.
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. The software is provided as a minimum in source code form as. Please be sure to check the gtopo30 frequently asked questions for further information, or if you are having difficulties viewing the data. For easier distribution, gtopo30 has been divided into tiles which can be selected. Earth explorer can be used to download the data, it is under the digital elevation category. Description z,refvec gtopo30tilename reads the gtopo30 tile specified by tilename and returns the result as a regular data grid. The original data can be downloaded from the gtopo30 home page. For more information about the data you are downloading, including documentation and how to properly cite the data, please visit usgs. 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. Hydrosheds is a mapping product that provides hydrographic information for regional and globalscale applications in a consistent format.
Although this software program has been used by the u. The srtm data is publicly available as 3 arc second approximately 90 meters resolution at the equator dems cgiarcsi, 2006. 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. For more information about the data you are downloading, including documentation and how to properly cite the data, please visit parent directory page. The national elevation dataset ned is a raster product assembled by the u. To be removed read 30arcsecond global digital elevation. For easier distribution, gtopo30 has been divided into tiles. Landsat 7 enhanced thematic mapper plus collection 1 level1. Download srtm 30m digital elevation models for free. Coverage maps indicating the availability of hydro1k products are available for download. 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.
If you plan on using earthexplorer frequently, you may wish to register. Nov 30, 2011 this new elevation data called global multiresolution terrain elevation data 2010 gmted2010, replaces the thirty year old gtopo30 terrain model. Background information about our remote sensing data is provided here, including collection overview, instrument specifications, and workflow examples. Webgis free terrain data geographic information systems. 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. 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. Elevations in gtopo30 are regularly spaced at 30arc seconds approximately 1 kilometer. It has not the greatest resolution, approximately 1 km and split into 33 tiles available in usgs dem file format. Gtopo30 was derived from several raster and vector sources of topographic information. Geological survey usgs for use by the usgs in fulfilling its mission. Gtopo30 is a global digital elevation model dem with a. Geological survey usgs with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. The software and related documentation on these web pages were developed by the u. 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.
Default data set determines which data sets to use when first loading glovis next. Terrain data description fao soils portal food and. This filter will only be applied to data sets that support cloud cover filtering in the data set list denotes cloud cover support. Gtopo30 is a global digital elevation model dem produced by the u.
We will not distribute responses associated with you as an individual. Geological survey usgs with a horizontal grid spacing of 30 arc seconds. Hydro1k is a geographic database developed to provide comprehensive and consistent global coverage. The time required to complete this information collection is estimated to average 2 minutes per response. Geological surveys eros data center in sioux falls, south dakota.
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