DTED

Digital Terrain Elevation Data ( DTED; German digital terrain elevation data ) is a digital terrain model in a grid with evenly spaced intervals.

They correspond to the terrain data of the USGS, but were designed by the National Geospatial- Intelligence Agency ( NIMA ), now the NGA for military purposes.

The DTED files are based on information from the latitude and longitude in WGS84 and are divided into 1 ° packets, which in turn are divided into individual cells with fixed dimensions. Each cell is assigned a height value. The DTED level specifies the cell size:

  • In DTED -0 is the cell expansion 30 arc seconds (arc -seconds ), which corresponds to 1 km
  • In DTED -1 is the cell length 3 arc second (or approximately 100 meters)
  • In DTED -2 cells width is 1 arc second ( approximately 30 meters )

The DTED - 0 data have a circumference about 2 gigabytes (compressed about 800 megabytes ) and can be downloaded free on the NGA pages. Higher DTED levels are not freely available.

The DTED data format is in the " U.S. Military Specification Digital Terrain Elevation Data ( DTED ) MIL- D- 89020B described ".

Are complemented by digital terrain data Feature Analysis Data, a collection of digital cartographic data from the U.S. Defense Mapping Agency (DMA, now merged into the NGA).

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