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Extracting saddle point fast based on topological relationship

KONG Yueping;YI Wei;ZHANG Yuepeng;Xi’an University of Architecture and Technology;Xi’an Research Institute of Survey and Mapping;  
Based on the analysis of the saddle's characteristics, extract the feature points by using the mobile window method,then layer the grid DEM data in order to simulate the geomorphic characteristics of contour map. Thus distinguish them by examining the topological relationship with its' surrounding area. The experimental results show that the algorithm is fast, simple and fit the landform cognition.
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