altitude datum

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altitude datum

The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 29.92 inches of mercury (1013.2 m.bs); and for true altitude, mean sea level. See also altitude.

Dictionary of Military and Associated Terms. US Department of Defense 2005.

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altitude height
height datum

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