WEBGIS快速地理投影计算  

A Method for Fast Cartographic Transformation of WEBGIS

作　　者：陈甫[1] 郑婉勤[1] 章文毅[1] 杨进[1] 

机构地区：[1]中国科学院中国遥感卫星地面站,北京100086

出　　处：《计算机工程与应用》2006年第20期210-212,共3页Computer Engineering and Applications

基　　金：科技部和北京市奥运重点项目"小卫星对地观测数据地面预处理系统研制"资助

摘　　要：由于客户端的功能限制,直接在WEBGIS客户端实现复杂的投影坐标系到地理坐标系的转换是不现实的。文章利用线性逼近的原理,通过设计一个三角网格插值的办法,极大简化了客户端的计算复杂性。服务器负责计算网格点的投影换算,建立线性转换矩阵,把矩阵传递到客户端,客户端依据矩阵做实时的投影转换。这是个通用的设计,可以适合于任何投影方式,精度也很高,有很好的应用前景。Cartographic Transformation is so complex that it is not realizable to do it on the client side of WEBGIS which is designed for only simple computation.Base on the linear approach algorithm,a triangle grid model is created to simplify the calculation for the client side.We suggest the server side to do the cartographic transformation for the grid points,and then get a linear transform matrix each grid for the other points.In the client side,the real-time Cartographic Transformation can be done using the matrixes that have been passed by the server.This is a general design with highly effective for any geographical project,and has a promising prospect.

关 键 词：WEBGIS 地图投影变换 插值逼近 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]