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form lines - [cartography] Lines on a map that approximate the shape of terrain in lieu of actual contours. Form lines do not refer to a true datum and do not necessarily use regular intervals.
[Category=Geospatial ]
Source: esri, 23 April 2012 10:19:31, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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