- i. The difference between the actual height of a certain pressure surface over sea level and the height of the same pressure surface of the International Standard Atmosphere. It is the difference between the reading of a radio altimeter and a pressure altimeter while flying over the sea. Also known as a D-factor.ii. The amount (positive or negative) by which the altitude (Z) of a point on an isobaric surface differs from the altitude (ZP ) of the same isobaric surface in the ICAO Standard Atmosphere (i.e., D-value = Z − ZP ) (ICAO).
Aviation dictionary. 2014.
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