DTED (Digital Terrain Elevation Data)
The DTED format was developed for the distribution of gridded elevation data that was assembled by the US Defense Mapping Agency (DMA). The DMA later changed it's name to National Imagery and Mapping Agency (NIMA) but is now called the National Geospatial Intelligence Agency (NGA). DTED data is available at three different resolutions, which are referred to as Level 0, Level 1 and Level 2. Each DTED file contains elevation data for a 1 degree latitude by 1 degree longitude cell. Latitudes are divided into a total of 5 zones, and the x-size of pixels differs for each zone, getting larger toward the poles.
Latitude Ranges for Zones:
How to Import
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 ".dt0", ".dt1" or ".dt2".
National Geospatial Intelligence Agency (NGA) of the U.S. Department of Defense
Level 0 data is available for most of the world. Level 1 data is available for the US and is distributed in a different format by the USGS. NGA will acquire new Level 2 data as a result of the Shuttle Radar Topography Mission (SRTM).
Download DEMs: http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/rast_roam.html
NGA Home: http://www1.nga.mil
DTED Wikipedia Page: http://en.wikipedia.org/wiki/DTED
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