Altitude

Posted: 30 April 2001

Elevation above mean sea level. Usually the altitude of a fixed point, such as a mountain peak, is determined most accurately by triangulation with optical instruments. The altitude of an aircraft, however, is measured most accurately by means of a radio altimeter."Altitude (geography)," Microsoft® Encarta® Online Encyclopedia 2001 "Altitude (geography)," Microsoft® Encarta® Online Encyclopedia 2001http://encarta.msn.co.uk © 1997-2001 Microsoft Corporation. All rights reserved.