What are the DTED levels?
What are the DTED levels?
DTED File Conventions
| Level 0 | ~900 meter | 30 arc seconds |
|---|---|---|
| Level 1 | ~90 meter | 3 arc seconds |
| Level 2 | ~30 meter | 1 arc second |
Is DTED raster or vector?
continuous numeric raster format
DTED is a continuous numeric raster format whose data is stored in 2-byte signed integers. The value -32767 is considered to be Nodata.
What does DTED stand for?
DTED (or Digital Terrain Elevation Data) is a standard of digital datasets which consists of a matrix of terrain elevation values, i.e., a Digital Elevation Model.
What is a DTED file?
The Digital Terrain Elevation Data (DTED) format is a map format for terrain elevations published by the U.S. National Imagery and Mapping Agency (NIMA). The DTED files contain digital terrain models as rasters. A raster is a georeferenced grid containing a value in each one of its cells.
How often is DTED updated?
A new version is released every four months.
Where can I get DTED data?
The military format specification (MIL-PRF-89020B) for the Digital Terrain Elevation Data (DTED) is available in a multitude of locations, including the NGA reference site and at the USGS (which publishes some SRTM data in DTED format).
Where can I get DEM data?
5 Free Global DEM Data Sources – Digital Elevation Models
- Space Shuttle Radar Topography Mission (SRTM)
- ASTER Global Digital Elevation Model.
- JAXA’s Global ALOS 3D World.
- Light Detection and Ranging (LiDAR)
- Mars Orbiter Laser Altimeter (MOLA)
What is post spacing DTED?
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. DTED0 post spacing is 30 arc seconds (approximately 1000 meters).
What is DEM in remote sensing?
A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. DEMs are created from a variety of sources. USGS DEMs used to be derived primarily from topographic maps.
How do you collect elevation data?
Elevation data can be generated from existing contour maps, photogrammetric analysis of stereo aerial photography, satellite imagery (as described in the STRM article), or laser flights. Elevation values are most commonly shown relative to sea level.
How do I know my DEM resolution?
An equation you can use that relates map scale expressed as a representative fraction (1/x), DEM cell resolution, and map display resolution is: 1/x = 1 / (DEM cell ground size [cm/cell] × map pixel density [pixels/cm]), so that 1 centimeter on the map represents x centimeters on the ground.
