The product rge alti is a dem of 1 meter of spatial resolution, with at least 50 cm of precision. The file extension is dem but its not the same format as normal usgs dem. It is a digital elevation model for whole world created and distributed by usgs. Nov 30, 2011 this new elevation data called global multiresolution terrain elevation data 2010 gmted2010, replaces the thirty year old gtopo30 terrain model. The gtopo30 global digital elevation model is made by the u. All elevations are in meters referenced to the wgs84egm96 geoid as documented at. Merge dem files togetherresample and crop demsdisplay dems in shaded relief, with. To be removed read 30arcsecond global digital elevation. Gtopo30 was derived from several raster and vector sources of topographic information. Access to the data is governed by the draft delegated regulation on copernicus data and information policy. Macdem is an application to view and edit digital elevation model dem files. Download free and lossless lidar compression data wikipedia national lidar dataset wikipedia national lidar dataset united states arcgis opendata catalog openterrain list. It is therefore handy for creating maps of large parts of the world.
Download and convert gtop30 dem data from the usgs site and convert and process this data. See the gmted2010 page for more information and download of compact data files at some standard resolutions. Sep 26, 2017 how to download free digital elevation model dataset dem from usgs to download dem. Usgs eros archive digital elevation global 30 arcsecond.
Digital elevation models freeware free download digital. Earth explorer can be used to download the data, it is under the digital elevation category. Gtopo30 is a digital elevation model for the world, developed by united states geological survey usgs. Temis gtopo30 elevation data at different resolutions. The link to the prices for commercial use is available on the left side of the page. Using the gtopo30 global topographic data set with arcgis. Description z,refvec gtopo30tilename reads the gtopo30 tile specified by tilename and returns the result as a regular data grid. Gtopo30 is a global digital elevation model dem with a. Simpledemviewer for mac free download and software. For easier distribution, gtopo30 has been divided into tiles which can be selected. Nextmap world 30 commercial data claims seamless, voidfree coverage across the entire globe, 30meter ground sampling.
The data are stored in row major order all the data for row 1, followed by all the data for row 2, etc. For easier distribution, gtopo30 has been divided into tiles which can be selected from the map shown above. You can make mercator projection map, corn projection map, orthographic projection maps. Reading and visualization of gtopo30 data, provided by eros data center. However, for some unknown reason, the downloaded dems do not open properly in photoshop. 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. Download srtm 30m digital elevation models for free. Digital elevation global 30 arcsecond elevation gtopo30. Available here for free, click image to download link photo scenery maker by takuya murakami scenery creation tool for fs2002fs2004. Free digital elevation model dem and free satellite data. Geological surveys eros data center in sioux falls, south dakota. This table shows some typical usages of gtopo30 and how to update your code to use readgeoraster instead. Explore the worlds largest civilian collection of images of the earths surface.
Its free use is restricted to public service and research application. How to download free digital elevation model dataset dem from usgs to download dem. The usgs dem geometry import converter imports, manipulates and converts digital elevation model dem data as well as gtopo30 dem data. Srtm 3arc seconds, world from 56 s to 60 n, public domain, 3arc seconds. The resulting data can be directly downloaded and is now as of 2004 the best available global 1km elevation dataset. While there are many free versions available in the public. A pentium class pc with 64 mb of ram and 120 mb of free hard drive space, an internet connection, arcview gis 3. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. If tilename is empty or omitted, a file browser will open for interactive selection of the.
Gtopo30 is a global digital elevation model dem produced by the u. The eudem is a hybrid product based on srtm and aster gdem data fused by a weighted averaging approach and it has been generated as a contiguous dataset divided into 1 degree by 1 degree tiles, corresponding to the srtm naming convention. It supports gtopo30, etopo2, etopo5, globe, srtm, srtm dted, hydro1k, and many bil form data. Usgs ascii dem format is not particularly good as a data format because it is ascii. Gtopo30 is a global raster digital elevation model dem providing terrain elevation data with a horizontal grid spacing of 30 arc seconds approximately 1. It supports gtopo30, etopo2, etopo5, globe, srtm, srtm dted, hydro1k and many bil form. Click on the srtm30 tile to download the digital elevation map dem from the place you select. Free satellite data, satellite imagery, digital elevation models dems, topographic maps and free software links. Exe program, this importer can also read in the sdts dem file format see below for more information about sdts files. We can verify that the domain is for sale over the phone, help you with the purchase process, and answer any questions. This data can be converted to grid format using arcview gis with the arcview spatial analyst extension. This makes the file size several times larger than a well. Gtopo30 is a global digital elevation model dem resulting from a. Gtopo30 digital elevation model dem data available from the u.
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 usgs earth explorer is a similar tool to the usgs global visualization viewer glovis in that users. It has not the greatest resolution, approximately 1 km and split into 33 tiles available in usgs dem file format. Gmted2010 is a suite of seven raster data products. Click the button below to download the 3dem setup program. The usgs global data explorer has version 2 of the 30 m aster global demapparently its an improvement over version 1, but in my opinion its still pretty crummy. Gtopo30 is a global digital elevation model dem resulting from a collaborative effort led by the staff at the u. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing. There are no header or trailer bytes embedded in the. This article explains how to download the global 30arcsecond gtopo30 digital elevation model dem data available from the u. A better source for the 90 m srtm dem is cgiars website. Global elevation data evaluation and basemaps bigdata earth. Geological survey usgs with a horizontal grid spacing of 30 arc seconds. 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.
Find satellite images and data, aerial photography, elevation and land cover datasets, digitized maps, and our image gallery collections. This document describes how to obtain and unpack the data, read it into to arcgis, select an area of interest, and finally whack it into arcmap in order to produce. Flight simulation design utilities from the free flight site. 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. The eu dem is a hybrid product based on srtm and aster gdem data fused by a weighted averaging approach and it has been generated as a contiguous dataset divided into 1 degree by 1 degree tiles, corresponding to the srtm naming convention.
Elevations in gtopo30 are regularly spaced at 30arc seconds 1120th of a degree, which is approximately 1 kilometer at the equator. Usgs hydro 1k elevation derivative database is a version of gtopo30 which has been corrected using hydrology data. Including a comprehensive terminal client, height using bilinear interpolation, create dem bitmaps, rle tile combined data. This new elevation data called global multiresolution terrain elevation data 2010 gmted2010, replaces the thirty year old gtopo30 terrain model. Hgt the dem is provided as 16bit signed integer data in a simple binary raster. They also have the 30 m and 90 m shuttle radar topography mission dem and the 1 km gtopo30 dem.
Download and clip a portion of the srtm 30m dem giving bounding box as wgs84 coordinates. Usgs earth resources observation and science eros center archive spans from 1937 aerial photographs to millions of. For more details on the public data distribution rights and how to download gtopo30 visit. Friendly program to view srtm30 tiles in 3d and several other dem. Other sources, catalogues and lists for high resolution open dem data. Webgis free terrain data geographic information systems. Unlike gtopo30, the readgeoraster function requires you to specify a file extension.
The resolution is suitable for continental or country mapping. Gtopo30 is provided on cdroms which the usgs will mail to you for free, including the postage. Five cdroms are needed for coverage of the entire world. 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. Earn 10 reputation in order to answer this question.
Download srtm30 headers needed for some applications click on the srtm30 tile to download the digital elevation map dem from the place you select. Elevation data sets at different resolutions has been compiled from the gtopo30 global digital elevation model for use in making several data products. It can be considered to be either an srtm data set enhanced with gtopo30, or as an upgrade to gtopo30. Nextmap world 30 commercial data claims seamless, void free coverage across the entire globe, 30meter ground sampling. Srtm data was used to update the older usgs gtopo30 global dem, by averaging to 30 arcsec resolution and replacing gtopo30 heixels between the latitudes of 60 north and 56 south. This article explains how to download the global 30arcsecond. The 3dem application produces three dimensional terrain scenes and flyby animations from a wide variety of freely available data sources including. Download free and lossless lidar compression data wikipedia. The gtopo30 data set provides a digital elevation model of the entire world at a resolution of approximately 1km.
Geological survey usgs with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. Elevations in gtopo30 are regularly spaced at 30arc seconds approximately 1 kilometer. Srtm30 tile to download the digital elevation map dem. Simpledemviewer browses dem digital elevation model data as pictures.
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