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radar altimeter - [physics] An instrument that determines elevation, usually from mean sea level, by measuring the amount of time an electromagnetic pulse takes to travel from an aircraft to the ground and back again.
[Category=Geospatial ]
Source: esri, 24 July 2012 09:17:58, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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