面向二维GIS矢量数据三维可视化的地形匹配技术研究

提出一种二维GIS矢量数据三维可视化过程中地物与地形的快速匹配方法.结合矢量所代表地物的特性,对基于矢量信息的三维地物进行了分类,综合采用了地物匹配地形和地形匹配地物两种方法.地物匹配地形算法通过实时调整地物的位置和姿态实现与地形的匹配,地形匹配地物算法以不同的距离度量为基础,对矢量约束域内地形进行变形操作实现匹配.本算法还讨论了原始地形数据分辨率较低以及多个地形匹配影响域相交等特殊情况的处理方法.试验结果表明,本方法能满足基于点、线、面矢量信息的三维地物与地形的匹配需求,实现地物与地形无缝结合及平滑过渡,从而达到改善视觉效果的目的.

Terrain Matching for Three-dimensional Visualization of Two-dimensional GIS Vector Data

A fast terrain matching method for 3D visualization of 2D GIS vector data was proposed. 3D terrain features based on vector information were firstly classified by its characteristic,thcn either feature adjusting or terrain adjusting method was chosen for matching of features and terrain. Feature adjusting method adjusted the position and gesture of features in real-time,terrain adjusting method applied terrain deformation to vector constrained field based on different distance measurement. I}he algorithms also dealt with some special cases such as low resolution of terrain dataset and multi-vector restriction applied to the same area. Experimental results show that our method could meet the requirement of terrain matching effectively for 3D terrain features based on vector data including points,lines and surfaces with high visual quality.