DTED

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DTED (or Digital Terrain Elevation Data) is a standard of digital datasets which consists of a matrix of terrain elevation values. This standard was originally developed in the 1970s to support aircraft radar simulation and prediction.

DTED supports many applications, including line-of-sight analyses, terrain profiling, 3-D terrain visualization, mission planning/rehearsal, and modeling and simulation. DTED is a standard National Geospatial-Intelligence Agency (NGA) product that provides medium resolution, quantitative data in a digital format for military system applications that require terrain elevation.

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:

Zone latitude interval latitude (arc sec) interval longitude (arc sec)
I 0°–50° (North–South) 3 3
II 50°–70° (North–South) 3 6
III 70°–75° (North–South) 3 9
IV 75°–80° (North–South) 3 12
V 80°–90° (North–South) 3 18

In addition three more levels (3, 4 and 5) at increasing resolution have been proposed, but not yet standardized.

DTED data is stored in a big endian format where negative numbers are signed magnitude.

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