球面离散网格在椭球面上的扩展及变形分析  

Projection of spherical grid on ellipsoid and analysis of its deformation

作　　者：贲进[1] 童晓冲[1] 张永生[1] 张衡[1] 

机构地区：[1]解放军信息工程大学测绘学院,郑州450052

出　　处：《测绘科学》2006年第4期25-27,59,共4页Science of Surveying and Mapping

基　　金：国家863计划项目(2003AA783060-3);测绘学院基金项目(Y0503)

摘　　要：球面离散网格数据模型是管理海量数据的有效途径之一,现有网格建立的基础是球面而不是椭球面,因而不能满足地理空间数据高精度应用的需要。围绕这一问题,建立了球面到椭球面的几种对应关系,从而将球面网格投影到椭球面上;结合实验分析了网格的最大最小边长比、最大最小夹角比和最大最小面积比,从而为该方法的实际应用奠定了基础。Spherical discrete grid data model is the essential way of massive data management.Instead of ellipsoid,almost all kinds of grids are based on sphere at present.And they do not meet the high precision need of many applications.To solve this problem,the paper establishes several corresponding relationships between sphere space and ellipsoid space by which the grids are projected from the formal to the latter.Also,the paper analyses the distributions and rules of deformation with the result of experiment.

关 键 词：球面离散网格 椭球面 投影 变形 

分 类 号：P28[天文地球—地图制图学与地理信息工程]