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Landform
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==Recent developments== Landforms may be extracted from a [[digital elevation model]] (DEM) using some automated techniques where the data has been gathered by modern satellites and [[stereoscopic]] [[aerial photography|aerial surveillance]] cameras.<ref>{{cite web|url=http://www.colorado.edu/research/cires/banff/pubpapers/198/ |title=Conference paper: "Automated landform classification using DEMs"|access-date=26 June 2008|author1=Robert A. MacMillan |author2=David H. McNabb |author3=R. Keith Jones |date=September 2000}}</ref> Until recently, compiling the data found in such data sets required time consuming and expensive techniques involving many man-hours. The most detailed DEMs available are measured directly using [[LIDAR]] techniques.
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