基于QTM的WGS-84椭球面层次剖分及其特点分析

Character Analysis and Hierarchical Partition of WGS-84 Ellipsoidal Facet Based on QTM

在分析现有球面剖分的基础上,发展出一种基于四元三角格网(QTM)的WGS-84椭球面层次剖分方法;并计算不同层次剖分格网的面积、边长变化情况,分析格网的特点。研究表明该格网近似规则,且具有层次嵌套性等特征,为其实用化和误差控制提供了依据。

In order to building multi-resolution global data model,the existent partition methods of spherical surface were analysed,and a hierarchical tessellation meshes of WGS-84 ellipsoidal surface based on quaternary triangular meshes（QTM） is put forward.The area and side length of the multi-resolution meshes on different levels are calculated,and the character of the cells is also analyzed.The research indicates that the cells are approximately regular,hierarchical nesting,and so on,which can be the basis of its utility and error control.