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中文摘要：
According to the topography of mountains, the discrete data points from map of the whole region are first subdivided into subregions with the points taken from the feature lines of ridge, valley and scarp being inserted into the map point set, and using the feature lines as the boundaries of subregions to build constrained Delaunay TIN. Such an approach has the advantages of ensuring high accuracy and fast speed of line layout.
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