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{{main|Data model (GIS)}}
A data model in [[Geographic information system]]s is a mathematical construct for representing geographic objects or surfaces as data. For example,
* the [[vector graphics|vector]] data model represents geography as points, lines, and polygons
*the raster data model represent geography as cell matrixes that store numeric values; * and the [[Triangulated irregular network]] (TIN) data model represents geography as sets of contiguous, nonoverlapping triangles.<ref>Wade, T. and Sommer, S. eds. ''[http://store.esri.com/esri/showdetl.cfm?SID=2&Product_ID=868&Category_ID=49 A to Z GIS]''</ref>
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