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structure line - [3D analysis] A line feature enforced in a TIN. There are two types of structure lines: hard and soft. Hard structure lines, also known as breaklines, represent interruptions in the slope of the surface. Soft structure lines are used to add information about the surface without implying a change in the surface behavior across the line.
[Category=Geospatial ]
Source: esri, 04 September 2012 10:46:57, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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