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In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).
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.This standard was originally developed in the 1970s to support aircraft radar simulation and prediction.
Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level.
Mapping Multifunction radar in an Air/Ground mode. Marking Friendly aircraft leaving contrails. Marmon 5" (127 mm) gun. Marshal/Marshalling Establish/established at a specific point. Medium Target altitude between 10,000 feet (3,000 m) Above Ground Level (AGL) and 25,000 feet (7,600 m) above Mean Sea Level (MSL). Merge/merged
The software team made the program flexible enough to be used not just for roads and rivers, but almost any kind of spatial data: provincial boundaries, power-station locations, satellite images, and so on. The program was named JUMP (JAVA Unified Mapping Platform), and it has become a popular, free Geographic Information System (GIS).
The MEF on Canadian VFR navigation charts is calculated by taking the higher value of: . the top elevation of the highest obstacle plus the vertical accuracy (a variable number of feet) of the terrain source data; or
Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. Pressure altitude divided by 100 feet (30 m) is the flight level, and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions ...
Vertical references in Europe View from Newlyn harbour showing the lighthouse and Newlyn Tidal Observatory to its right, both painted red and white.. An ordnance datum (OD) is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps.