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Height expressed in units of distance above a reference plane, usually above mean sea level or above ground.
corrected altitude-Indicated altitude of an aircraft altimeter corrected for the temperature of the column of air below the aircraft, the correction being based on the estimated departure of existing temperature from standard atmospheric temperature; an approximation of true altitude.
density altitude-The altitude in the standard atmosphere at which the air has the same density as the air at the point in question. An aircraft will have the same performance characteristics as it would have in a standard atmosphere at this altitude.
indicated altitude-The altitude above mean sea level indicated on a pressure altimeter set at current local altimeter setting.
pressure altitude-The altitude in the standard atmosphere at which the pressure is the same as at the point in question. Since an altimeter operates solely on pressure, this is the uncorrected altitude indicated by an altimeter set at standard sea level pressure of 29.92 inches or 1013 millibars.
radar altitude-The altitude of an aircraft determined by radar-type radio altimeter; thus the actual distance from the nearest terrain or water feature encompassed by the downward directed radar beam. For all practical purposes, it is the" actual" distance above a ground or inland water surface or the true altitude above an ocean surface.
true altitude-The exact distance above mean sea level.
source: FAA Aviation Weather for Pilots (AC 00-6A)
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