The dt0 dted level 0 file format specifies how bits are used to encode information in a digital storage medium. Level 0 covers only about 50% of the area covered by gtopo30, but much of the difference is in antarctica. Access constraints srtm dted level 1 3 arc second data for global coverage is distributed. Use the free 21day full working demo to process the file at your location. This is the best resolution dted map level that the app can use, with a nominal 30 meter cell spacing. The lowest resolution data is the dted level 0, with a grid spacing of 30 arcseconds, or about 1 kilometer. The global multiresolution terrain elevation data 2010 gmted2010 provides a new level of detail in global topographic data. Level 0 has a post spacing of 30 arc seconds in latitude direction ca. Vmap level 0 is the low resolution component of the vmap family of products. This edition includes the shuttle radar topography mission \srtm\ dted level 1 and level 2 requirements. To the best of our knowledge, no dted level 3 or higher has been produced in the nga dted format. The 1 kilometer data and some higherresolution data is available online, as are product specifications and documentation.
Each dted file contains elevation data for a 1 degree. Dted level 0 was derived from nga dted level 1 to support a federal. Geospatial repository and data management system grid. Dted level 2 is a uniform gridded matrix of terrain elevation. Converts digital terrain elevation data from one level to another. Dted supports negative as well as positive elevations so it works in death valley. Military specification digital terrain elevation data dted milprf89020b, and amongst other parameters describes the resolution for each level.
Dted level 0 elevation post spacing is 30 arc second nominally one kilometer. The national geospatialintelligence agency nga does not sell or perform services for the public. File open dt0 dted level 0 file data conversion ai. Choose import dem dted level 0, 1 or 2 from the file menu and then select the file, which will usually have the filename extension. Some code to load and process digital terrain elevation data dted files.
Load into world builderworld engine and have it export as tiled assets for unreal to read. Digital terrain model interpolation for mobile devices. I know i can download it, but you can only download small bits at a time. Fme is the data integration platform with the best support for spatial. Islands with an axis greater than 600 meters for dted level 1 or 300 meters for dted level 2 must appear in dted. In the end, i managed to add dted layer using rasterlayer. The files have file names with the extension dtn, where n is the level of the dted product. You can find published specifications for dted at the nga website.
Dted file extension the low cost mapworks surfaces addon running inside civil3d will read nga digital terrain elev data level 02. For information on locating map data for download over the internet, see the. Im kind of in an odd situation and need dted level 0 data but it looks like the nga raster roam site is down. Current dted format does not handle the higher resolution data very well, since the finest resolution that can be implemented is 0. September 2008 edited september 2008 in elevation data. The horizontal datum is the world geodetic system 1984 wgs84 and the vertical datum is mean sea level as determined.
In support of military applications, the national imagery and mapping agency nima has developed standard digital datasets digital terrain elevation data dted which is a uniform matrix of terrain elevation values which provides basic quantitative data for systems and applications that require terrain elevation, slope, andor surface roughness information. Level 0 has a post spacing of approximately 900 meters. They will be automatically used when subsampling elevation data on export like from dted2 to dted0. The dted level 0 accuracy record is copied from the dted level 1 accuracy record or will contain na not available when produced from vmap 0. There are three levels of the dted tiling scheme available. Milprf89020 digital terrain elevation data \dted\ this specification defines the requirements within national imagery and mapping agency\s \nima\ digital terrain elevation data base which supports various weapon and training systems. The input can only be a single band raster dataset. Global multiresolution terrain elevation data 2010. Dted level 0, a new nima data base, is the result of a joint globedma initiative, which resulted in the joint design and dma production just before dma was reorganized into nima of dted level 0.
It is unclear what file sizes will be used for that data. Currently only converts dted1dted2 no longer in development due to personal time constraints. Radio mobile rf propagation simulation software dted. I remember about 78 years ago that data was still obtainable but it doesnt appear as though it is. A file format like dt0 dted level 0 file is a standard way that information is encoded for storage in a computer file. United states mapping agencies provide terrain elevation data in the form of data grids. Hi, does anyone know if i can buy a cd or dvd of level 0 dted data for the whole world.
National imagery and mapping agency, fairfax, virginia. Smaller islands with a vertical relief of at least 15 meters must also be included. Level 1 has a post spacing of approximately 90 meters. The edges of adjacent tiles have redundant records. Add dted data to a map layer geonet, the esri community. A data file of dted level 0 is produced from dted level 1 or vmap 0. Used in study to find large flat areas of world as possible places to locate gammaray telescope array. National geospatial intelligence agency nga of the u.
Dted level 1 corresponds to medium scale hardcopy products, and has a post spacing of three arcseconds, or 100 meter nominal resolution. The gmted2010 product suite contains seven new raster elevation products for each of the 30, 15, and 7. Each tiles extent is one degree in each direction, plus a half pixel on each edge so adjacent tiles have one column and row of overlap. Depending on how reasonably the decisions are made on these higher resolution data sets, they may or may not work in. The points in between the sampled points can be interpolated making use of the interpolation algorithms, with the addition of two sets of extra points whose coordinates are determined according to the existing sample points.
The dted level 0 data is relatively small, and is often published as a concatenation of large area or global tiles in other than dted format. Maps extend a half a cell outside the requested map limits. Dted level 0 data provides approximately 1km resolution of elevation data which requires smaller storage space. Those products and services that are available to the public can be obtained from the following sources. Digital terrain elevation data dted map and data library. Dted level 2 is the basic high resolution elevation data source for all military activities and systems that require landform, slope, elevation, andor terrain roughness in a digital format. During dted level 0 data sampling from dted level 1 data, the maximum and m inimum elevation value s of the points in the cell are recorded with the average. Exporting dted level 2 to dted level 0 global mapper forum.
Dted level 0 corresponds to small scale hardcopy products, and has a post spacing of 30 arcseconds, or one kilometer nominal resolution. Dted was used as the source for most of eurasia and large parts of africa and the americas. Dted level 2 30m will be available thru the 2000 sts99 shuttle ifsar mission in 2001. Magnetic cdroms which, in addition to the digital terrain elevation data, contain such supplementary data as digital mean elevation data dmed which provides statistical information for the digital file of the elevation data to each 15 x 15 cell, in addition to the names file and the help and methods of use file. Vmap level 1 contains medium resolution data at the 1. Citeseerx digital terrain model interpolation for mobile. Digital terrain elevation data dted is a digital elevation model dem standard developed by the national imagery and mapping agency nima to support aircraft radar simulation and prediction. Raster to dteddata management toolbox documentation.
Caution the data will be extraced into a new folder called dted its part of the path stored with each file in the zip so be aware that you may end up with path which ends with dteddted, if this happens make sure the dted path in elevation configuration includes both the names example c. The output pixel size is dictated by the dted level, and the data is converted and stored as signed, 16bit integers. The lowest resolution data is the dted level 0, with a grid spacing of 30. It consists of geographic, attribute, and textual data stored on cdroms. Dted data is available at three different resolutions, which are referred to as level 0, level 1 and level 2.
The dted format for level 0, 1 and 2 is described in u. The originating data was dted level 0 downloaded from the nga raster roam page. Dted level 0 corresponds to small scale hardcopy products, and has a post spacing of 30. Shuttle radar topography mission dted level 1 3arc. The dted format is intended to be used with one band data that represents elevation, so this tool cannot be used for multiband images. Gesch global land onekm base elevation globe model and. Digital terrain elevation data national geospatial.
1557 894 1094 633 1383 1529 1123 656 1642 109 181 79 553 132 795 1586 1099 1122 17 1567 1082 871 439 339 700 1376 1647 1358 1288 647 1466 1394 866 244 618 391 849 775 148 98 652 212 1170 532 530 1374 666