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ground control - [geodesy] A system of points with known positions, elevations, or both, used as fixed references in georeferencing map features, aerial photographs, or remotely sensed images.
[Category=Geospatial ]
Source: esri, 06 May 2012 09:55:03, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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