However, this is one of the most important data sets for researchers and also for terrain modelers. You can browse many formats of digital elevation map data using the demdataui graphical user interface. The srtm digital elevation data provided on this site has been processed to fill data voids and to facilitate its ease of use by a wide group of potential users. Earth resources observation and science eros center. Gtopo30 is a global digital elevation model dem resulting from a collaborative effort led by the staff at the u. For details on locating this data set for download over the internet, see find geospatial data online. Collection usgs map indices downloadable data collection 11 recent views. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of 30 arc seconds approximately 1 kilometer. The global multiresolution terrain elevation data 2010 gmted2010 dataset contains elevation data for the globe collected from various sources. You can upload a shapefile in latlon, a kml file, or use the view window extents.
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 water body dataset astwbd on. The first are data that represent the information typically found on a topographic quadrangle map, such as contour lines, roads, streams, railroads, towns, etc. To run this example, you must download the gtopo30 data set. Geological surveys eros data center in sioux falls, south dakota. Hydro1k provides a suite of georeferenced data sets, both.
Gtopo30 is a global data set covering the full extent of. Rows and columns correspond to y and x axis for instance latitude and longitudethe value in each cell represents the measured quantify for. Extract and display full resolution data for the state of massachusetts. Gtopo30 is a digital elevation model for the world, developed by united states geological survey usgs. Topographic data are information about the elevation of the surface of the earth. Internet data sources for foreign countries gis data. The dem was derived from several raster and vector sources of topographic information. It is multiresolution, with areas at 30, 15, and 7. Your own area to specify and download a rectangular area in geographic coordinates. Free digital elevation model dem and free satellite data. The geo data portal is the authoritative source for data sets used by unep and its partners in the global environment outlook geo report and other integrated environment assessments. This release represents the completion of global coverage of 30arc second elevation data that have been available from the eros data center beginning in 1993.
Berikut ini adalah cara gratis download data dem aster global dem, gtopo30, srtm dan dsm dari berbagai sumber yang ada di internet. The data can be accessed via the earth explorer site. The global product has been mathematically analyzed and assessed, establishing the following data hierarchy ordered from highest to lowest quality. The analysis of products from multiple data sets with varying look angles shows that the theoretical offset and the. Theres a download that covers all of asia entity id. Hydro1k provides a suite of georeferenced data sets, both raster and vector. Gtopo30 is a global data set covering the full extent of latitude from 90 degrees south to 90 degrees north, and the full extent of longitude from 180 degrees west to 180 degrees east.
More than 10 years later, nasas srtm data still do not cover these areas. Model gtopo30 data in arcview gis continued from page 49 usgs dem data, which is provided in ascii format. Comments from users of gtopo30 are welcomed and encouraged. Jisao data elevation data in netcdf 1degree latitudelongitude resolution elevations, light shading for elevations 5000m, and increasingly darker shades for elevations 0 and 1500m.
The output global dem consists of 5 input dem data sets, which have been processed and formatted to the consistent configuration described below. North america digital elevation model represents an elevation map for north america derived from the global digital elevation model dem gtopo30 data sets from the u. The demdataui gui determines and graphically depicts coverage of etopo5, terrainbase, the satellite bathymetry model satbath, gtopo30, globe, and dted data sets on local and network file systems, and can import these files into the workspace. Hydro1k data covers every continent, and includes a hydrologically corrected dem, streams and drainage basins, and other ancillary data sets like flow direction. To download, srtm dem in usgs earth explorer select your area of interest. Read the stateline polygon boundary and calculate boundary limits. For easier distribution, gtopo30 has been divided into tiles which can be selected from the map shown above. Since the time gtopo30 was completed, higher quality elevation data has become available, due to new data sources. We also operate the landsat satellite program with nasa, and maintain the largest civilian collection of images of the earths land surface in existence, including tens of millions of satellite. The links below are connected directly to the nasa site courtesy of nasangausgs. National geospatialintelligence agency nga have compiled an enhanced global elevation model named the global multiresolution terrain elevation data 2010 gmted2010 that replaces gtopo30 dataset. Digital elevation global 30 arcsecond elevation gtopo30. Gtopo30 was derived from several raster and vector sources of topographic information. Hydro1k provides a suite of georeferenced data sets, both raster and vector, which will be of value for.
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 overall evaluation data of worldwide coverage of void filled data at a resolution of 1 arcsecond 30 meters and provide open distribution of this highresolution global data set. This data is provided in an effort to promote the use of geospatial science and applications for sustainable development and resource conservation in the developing world. Webgis geographic information systems resource gis. It was created by combining topographic data sets from u. The site uses a graphical interface to let visitors select tiles to download. Detailed information on the characteristics of gtopo30 including the data distribution format, the data sources, production methods, accuracy.
Query and order satellite images, aerial photographs, and cartographic products through the u. To avoid that the gtopo30 data are read incorrectly. Global multiresolution terrain elevation data, 2010. Elevations in gtopo30 are regularly spaced at 30arc seconds 1120th of a degree, which is approximately 1 kilometer at the equator.
Two such data types are commonly used with geopads. Breakline emphasis maintains the critical topographic features streams or ridges within the landscape by maintaining any minimum elevation. Read elevation data interactively extract dem data. Free digital elevation model dem and free satellite data download links. The dataset called gtopo30 hydro1k is a hydrology raster. The version of the dataset available here is breakline emphasis, 7. The gtopo30 files can be converted to ascii by creating a grid, which was done in the previous step, and applying the following formula. A global hydrologic database derived from 1996 gtopo30 data. 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.
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. At the usgs eros center, we study land change and produce land change data products used by researchers, resource managers, and policy makers across the nation and around the world. Under the data sets tab, select digital elevation srtm srtm 1arcsecond global. Then under the data sets tab, select digital elevation gtopo30 and download the desired file format. See the gmted2010 page for more information and download of compact data files at some standard resolutions. The other data sets that are available at usgs earthexplorer are aerial imagery, avhrr, dem aster gmted210, gtopo30, gtopo30 hydro 1k, ifsar alaska, srtm, digital maps, global forest and land data, lidar, radar, vegetation data and etcthe below procedure can be used to download other data sets as well. The data is in flat binary format and is extremely easy to read and write. The global 30arcsecond elevation data set gtopo30 is so named, because the spacing between adjacent elevation points is 30 arcseconds. The site will email you a link, since all the county and state ned data is prepackaged into zip files you should get a download link pretty quickly.
Height histogram and amplitude comparison of srtm and gtopo30 data over himalayan region. Geological surveys eros data center distributed active archive center edc daac. Next select the data sets tab and under digital elevation select gmted2010. Go to the arcuser online site for links to the usgs distributed active archive center. These data were by developed by the usgs eros data center in 1996 from a.
East and north bounds are adjusted automatically to make widthheight to be integer multiple of resolution xy. Click on the map below to download the data in zip format. 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. Data values are in whole meters, representing the elevation of the center of each cell.
Coverage maps indicating the availability of hydro1k products are available for download. Produced by the usgs in 2011 by combining the current best available global elevation data from public sources. The hydro1k database was developed by usgss earth resources observations and science eros data center from the global 30 arcsecond elevation data set gtopo30. Hydro1k is a geographic database developed to provide comprehensive and consistent global coverage. Completed in late 1996, gtopo30 was developed over a threeyear period through a collaborative effort led by. Numerous data holdings are available for free download, or, data can be purchased on media. The usgs earth explorer will let you download data from anywhere in the world.
A free dataset created by combining data from many sources, including. Reading and visualization of gtopo30 data, provided by eros data center. It has a 30arc second resolution approximately 1 km, and. Gmted2010 global multiresolution terrain elevation data. The collection are located under the digital elevation category. To download any of the above file formats, access earth explorer and select your area of interest.
Comparison of 30 global dems which will have slightly better resolution on land. First define your region of interest under the search criteria tab. Type kazakhstan into the place search criteria box, click over to data sets and type hydro into the data set search box. Several areas have been updated and the entire global data set has been repackaged, so these data supersede the previously released continental data sets. Ketersediaan data elevasi dalam bentuk digital elevation model dem sangat diperlukan dalam bidang sistem informasi geografis atau. Gmt and gridded data sets gmt can be used to calculate and display gridded data sets a gridded data set is an array of regularly spaced points in space you can think of it as a matrix or as a spreadsheet. Click the download link lowerleft of the search result text and youll see a list of available data sets, just check elevation, choose your format, and click next. The gtopo30 global digital elevation model is made by the u.
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