基于等高线的三角网建模及真实感地形重建

三维地形是自然环境模拟中不可缺少的重要组成部分,具有广泛的应用价值.文中提出了一种基于等高线的三角网建模算法.该算法利用等高线固有的特性及其比邻拓扑关系,将等高线作为特征线并适当增加特征点,改进三角网生长算法,构建带约束条件的狄洛尼三角网.实验采用我国东北某山区的真实等高线数据运用该算法模拟地形.结果表明,该算法具有较高的构网效率,保留了等高线所包含的丰富的地形特征,较好地实现了三维真实感地形重建.

Triangular Network Modeling and Terrain Reconstruction Based on Contours

3D terrain is an indispensably important part of entironment simulation is widely used in many fields.This paper presents a method for building triangular network based on contour lines.The method builds Constrained Delaunay Triangulation using inherent quality and neighboured topological relation of contour lines,improves triangle expanding method,regarding Contour lines as the characteristic lines and adding latent nodes.The terrain is reconstructed from the real contour lines of a mountainous area northeast of China with this method.The result shows that the arithmetic has a good efficiency in building network and the terrain surface preserves plenty of terrain propoties and the 3D real sense terrain reconstruction is realized.