Dted Level 0 Download

[Angelines Mulready]

<div>The DTED format for level 0, 1 and 2 is described in U.S. Military Specification Digital Terrain Elevation Data (DTED) MIL-PRF-89020B, and amongst other parameters describes the resolution for each level:</div><div></div><div></div><div></div><div></div><div></div><div>dted level 0 download</div><div></div><div>Download Zip: https://t.co/ugCMt4M1jD </div><div></div><div></div><div>Does the specification for DTED 0 - 2 also apply to 3 - 5? I know the finest resolution supported by spec MIL-PRF-89020B is 0.1 arc-seconds which I think would barely cover up through DTED level 4, right? I'm guessing then that my code for reading DTED 0 - 2 using just the header information should still work for the later DTED levels but I have no way of proving this.</div><div></div><div></div><div>Could you please let me know how I could export to a DTED file level4? I can see that it goes up to DTE3 only (see attached) while as shown below I believe it is possibleto have better resolution in DTED and my loaded source map is MDT05 LIDAR with 5m grid.</div><div></div><div></div><div>I am importing DTED level 1 from zone II above north 50 latitude (6 arc sec) and it is coming in as if the data is imported as zone1 (3 arc sec). The coverage is only the left half of the geo-cell. Is there a way to configure Global Mapper to recognize the grid spacing differences between zones.</div><div></div><div></div><div>Digital Terrain Elevation Data (DTED): The full resolution 3" DTED have a vertical accuracy of 30 meters (two-sigma) linear error at the 90 percent confidence level (Defense Mapping Agency, 1986), where they meet specifications. If the error distribution is assumed to be Gaussian with a mean of zero, the statistical standard deviation of the errors is equivalent to the root mean square error (RMSE). Under these assumptions, vertical accuracy expressed as 30 meters linear error at 90 percent can also be described as a RMSE of 18 meters.</div><div></div><div></div><div></div><div></div><div></div><div></div><div>The areas of GLOBE derived from DTED might be interpreted to retain (or slightly improve upon) the level of vertical accuracy found in the source 3" data. This is because the representative value computed during compositing to 30" is either a simple value (as in nearest-neighbor or spot sampling) at the same vertical accuracy as the source data, or is a computation (as a mean or median) that should reduce some of the random error in a sample of source 3" values.</div><div></div><div></div><div>GDAL supports DTED Levels 0, 1, and 2 elevation data for read access.Elevation data is returned as 16 bit signed integer. Appropriateprojection and georeferencing information is also returned. A variety ofheader fields are returned dataset level metadata.</div><div></div><div></div><div>SRTM DTED is a uniform matrix of elevation values indexed to specific points on the ground. The horizontal datum is the World Geodetic System 1984 (WGS84) and the vertical datum is mean sea level as determined by the WGS84 Earth Gravitational Model (EGM 96) geoid. The elevation data are with respect to the reflective surface, which may be vegetation, man-made features or bare earth. DTED Level 2 elevation values are spaced one arc second apart between 0 degrees and 50 degrees latitude, and spaced one arc second apart in latitude and two arc seconds apart in longitude between 50 degrees and 60 degrees latitude. SRTM DTED Level 1 values are derived from the SRTM DTED 2 values such that the DTED 1 values are identical to the DTED 2 values at coincident points. However, the SRTM DTED 1 values are spaced 3 arc seconds apart between 0 degrees and 50 degrees latitude, and spaced 3 arc seconds apart in latitude and 6 arc seconds apart in longitude between 50 degrees and 60 degrees latitude.</div><div></div><div></div><div>DTED is a uniform matrix of terrain elevation values. It provides basic quantitative data for all military systems that require terrain elevation, slope and gross surface roughness information. Data density depends on the level produced.</div><div></div><div></div><div>DTED files support a set of fixed resolutions (i.e. DTED levels) which are defined as aligning on particular boundaries. When you select the DTED level to export to and the export bounds, this defines which DTED tiles need to be generated to conform to the DTED standards for that level.</div><div></div><div></div><div>The file name of the tiles are computed from the usual naming specifications for DTED files:</div><div></div><div> The DTED file names are named LXX.dtY where L can be 'n' (North) or 's' (South). XX is the latitude of the tile and Y the suffix of the DTED file depending on the DTED level (0, 1 or 2). For example, n09.dt0 is a tile of level 0, located at the latitude 9 North.</div><div></div><div> The DTED file parent directories are named LXXX where L can be 'e' (East) or 'w' (West) and XXX is the longitude of the DTED tiles contained in a parent directory. For example, w001/ is the directory containing dted tiles located at longitude 1 West.</div><div></div><div> The characters described above can be uppercase or lowercase. For example, n30.dt1 and N30.DT1 are two valid names for the same DTED tile. The case you use, however, depends on your file system.</div><div></div><div></div><div>fname = dteds(latlim,lonlim) returnsLevel 0 DTED file names (folder and name) required to cover the geographicregion specified by latlim and lonlim.This function constructs the file names for a given geographic regionbased on the file-naming convention established by the Defense DigitalTerrain Elevation Data (DTED) database.</div><div></div><div></div><div>DTED Converter was registered on SourceForge.net on Sep 2, 2009, and Converts Digital Terrain Elevation Data (DTED) from one level to another. Dted Converter currently only supports the conversion of data from DTED Level 1 to DTED level 2. The conversion process includes interpolating the 1201*1201 grid of elevation data to 3601*3601, which is the standard for Level 2 DTED Data, then adjusting the header information accordingly. This project is no longer in development due to personal time constraints, however if there are features you desperately need feel free to ask or, of course being open source, you could write it your self and let the developers know :)</div><div></div><div></div><div>Import DTED-format terrain data for a region around Boulder, Colorado, US. The terrain file was downloaded from the SRTM Void Filled data set available from the United States Geological Survey (USGS). The file is DTED level-1 format and has a sampling resolution of about 90 meters. A single DTED file defines a region that spans 1 degree in both latitude and longitude.</div><div></div><div></div><div>Update the scenario so that target positions are 250 meters above ground level instead of 500 meters above ground level. Rerun the same analysis as above to select the three best radar sites and visualize coverage. The new coverage map shows that reducing the visibility of the targets also decreases the coverage area.</div><div></div><div></div><div>A monostatic radar system was designed to detect non-fluctuating targets with 0.1 square meter radar cross section (RCS) at a distance up to 35000 meters. Radar sites were selected among five candidate sites to optimize number of detections over a region of interest. Two target altitudes were considered: 500 meters above ground level and 250 meters above ground level. The coverage maps suggest the importance of line-of-sight visibility between the radar and target in order to achieve detection. The second scenario results in targets that are closer to ground level and therefore more likely to be blocked from line-of-sight visibility with a radar. This can be seen by rotating the map to view terrain, where non-coverage areas are typically located in shadow regions of the mountains.</div><div></div><div></div><div>[Z, refvec] = dted returns all of theelevation data in a DTED file as a regular data grid, Z, withelevations in meters. The file is selected interactively. This function reads the DTEDelevation files, which generally have file names ending in .dtN,where N is 0,1,2,3,... refvec is the associatedthree-element referencing vector that geolocates Z.</div><div></div><div></div><div>[Z, refvec] = dted(filename, samplefactor)subsamples data from the specified DTED file. samplefactor is ascalar integer. When samplefactor is 1 (the default), DTED reads thedata at its full resolution. When samplefactor is an integern greater than one, every nth point isread.</div><div></div><div></div><div>[Z, refvec] = dted(filename, samplefactor,latlim, lonlim)reads the data for the part of the DTED file within the latitude and longitude limits.The limits must be two-element vectors in units of degrees.</div><div></div><div></div><div>[Z, refvec] = dted(foldername, samplefactor,latlim, lonlim)reads and concatenates data from multiple files within a DTED CD-ROM or folderstructure. The foldername input is a string scalar or charactervector with the name of a folder containing the DTED folder. Within the DTED folder aresubfolders for each degree of longitude, each of which contain files for each degree oflatitude. For DTED CD-ROMs, foldername is the device name of theCD-ROM drive.</div><div></div><div></div><div>If you call dted specifying arbitrary latitude-longitudelimits for a region of interest, the grid and referencing vector returned will notexactly honor the limits you specified unless they fall precisely on grid cellboundaries. Because grid cells are discrete and cannot be arbitrarily divided, thedata grid returned will include all areas between your latitude-longitude limits andthe next row or column of cells, potentially in all four directions.</div><div></div><div></div><div>Raster reading functions that return referencing vectors will be removed, includingdted. Instead, use readgeoraster, which returns a geographic postings reference object.Reference objects have several advantages over referencing vectors.</div><div></div><div></div><div>This table shows some typical usages of dted and how to update yourcode to use readgeoraster andgeorasterinfo. The readgeorasterfunction requires you to specify a file extension. For example, use [Z,R] =readgeoraster('n39_w106_3arc_v2.dt1').</div><div></div><div></div><div>Reading and concatenating multiple DTED files from a folder using thereadgeoraster function is not supported. Find the standardnames of the DTED files required to cover a region by using the dteds function. Then read the individual files by using thereadgeoraster function. For information about concatenatingraster tiles, see Mosaic Spatially Referenced Raster Tiles.</div><div></div><div></div><div>Australia's future safety, prosperity and sustainability depends on making informed policy and investment decisions that meet the needs of today, and the decades ahead. Digital elevation data which describes Australia's landforms and seabed is crucial for addressing issues relating to the impacts of climate change, disaster management, water security, environmental management, urban planning and infrastructure design. Geoscience Australia is working collaboratively across all levels of government, industry and academia to ensure decision makers, investors and communities have access to the best available elevation data to meet local, regional and national needs.</div><div></div><div> dca57bae1f</div>