the distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid
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Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennuväljad ja kopteriväljakud
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In respect to the World Geodetic System — 1984 (WGS-84) defined ellipsoid, the difference between the WGS-84ellipsoidal height and orthometric height represents WGS-84 geoid undulation.
