北京大学学报(自然科学版)

高效构建Delaunay三角网数字地形模型算法研究

胡金星, 潘懋, 马照亭, 吴焕萍   

  1. 北京大学地球与空间科学学院,北京,100871
  • 收稿日期:2002-10-09 出版日期:2003-09-20 发布日期:2003-09-20

Study on Faster Algorithm for Constructing Delaunay Triangulations DTM

HU Jinxing, PAN Mao, MA Zhaoting, WU Huanping   

  1. School of Earth and Space Sciences, Peking University, Beijing, 100871
  • Received:2002-10-09 Online:2003-09-20 Published:2003-09-20

摘要: 在对传统构建Delaunay三角剖分(尤其是分割-合并)算法进行分析的基础上,采用自适应格网划分方法对点集进行排序、分割,并按照逆序合并Delaunay子三角网,然后进行约束处理,快速、高效地实现了Delaunay三角网的构建;对Delaunay子三角网合并、地性线处理、平三角形处理等关键问题进行了描述。实测结果表明,该算法的时间复杂度接近于O(n)。

关键词: Delaunay三角网, 约束Delaunay三角网, 数字地形模型

Abstract: Based on the analysis of common Delaunay triangulations methods, especially the divide-and-conquer method, a faster algorithm for constructing Delaunay triangulations is presented. It divides the point set by self-adaptive grid, constructs and merges the sub-triangulations. The key problems of merging sub-triangulations, dealing with the terrain features and the flat triangles are described. The experiments show that the expected time of the algorithm is O(n).

Key words: DTM, Delaunay triangulations, constrained Delaunay triangulations

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