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true altitude[′trü ′al·tə‚tüd]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
(also, absolute altitude), in geodesy, the distance along a vertical from a given point on the surface of the earth to sea level. It is determined by leveling. In the USSR, true altitude is calculated from zero on the depth gauge in Kronstadt.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
i. The actual height above sea level. The calibrated altitude corrected for air temperature. See altitude.
ii. The actual altitude of a celestial body above the celestial horizon. The observed altitude must be corrected for several variables before it becomes the true altitude.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved