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《Science of Surveying and Mapping》 2004-05
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Extraction of ridge and valley from DEM based on conjugate terrain

HUANG Pei-zhi,CHEN Kai-hui,LIU Ze-hui(Shenzhen University,Shenzhen,Guangdong,PRC,518060)  
Ridge and valley are skeleton lines that indicate significant topographic features of the terrain.It is widely used in the fields of surveying and mapping,topography representation and engineering designing.Nowadays,with the wide use of computer in the fields,automatic extraction of ridge and valley from DEM plays an important part in the related areas.Drainage networks analysis method is a commonly used method for extraction of ridge and valley from DEM.In this paper,authors conclude that the method is inconvenient to the extraction of ridge after investigating into the method deeply.And a new method is put forward.The new method uses a conjugate terrain in aid of the extraction of ridge.Because a ridge of terrain is a valley in its conjugate terrain,extraction of ridge can be realized by extraction of valley in its conjugate terrain.Experimental result has proven the new method is quite effective and reliable in its identification of ridge and valley.
【Fund】: 广东省自然科学基金资助项目(021302)
【CateGory Index】: P284
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