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《Acta Geodaetica et Cartographica Sinica》 2013-04
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A Method of Terrain Feature Extraction Based on Contour

ZHANG Yao 1,FAN Hong 2,LI Yu ’ e 3 1.Sichuan Geomatic Center,Chengdu 610041,China;2.State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan430079,China;3.Sichuan Smart Map Information Technology Company,Chengdu 610041,China  
Terrain features include terrain feature points and terrain feature lines.They are basic object to analysis and processes of landscape,and the important contents of the structure generalization of landscape.A new method of contour-based terrain features lines extraction is proposed.Firstly,the contour lines are divided into two kinds of feature segments that include concave and convex segments,which corresponds to the valleys and ridges respectively,and using the maximum-angle as the constraint condition and using the edges of feature segments as the constraint edges,constrained Delaunay triangulation(referred to CDT)are constructed.Then,the skeletons of the CDT of every feature segment are traced and the local terrain structure line tree are constructed based on the obtained skeletons.And the leaf nodes of the terrain structure line trees are extracted and be treated as the terrain feature points of the corresponding feature segment.Finally,these terrain feature points are tracked and connected into terrain structure lines by applying the connecting criterion.
【CateGory Index】: P217
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