altitude datum
McGraw-Hill Science & Technology Dictionary:
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altitude datum
(′al·tə′tüd ′dad·əm)
(engineering) The arbitrary level from which heights are reckoned.
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altitude datum
McGraw-Hill Dictionary of Aviation:
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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 1013.2 hectopascals/millibars (29.92 in or 760 mm of mercury); and for true altitude, mean sea level.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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