参心大地坐标系中的几何量算问题  

Geometric Measurement in the Framework of Referential Ellipse's Earth Core Geodetic Datum

作　　者：李朝奎[1] 朱庆[1] 王涛[1] 赵杰[1] 

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2003年第2期149-152,157,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目 ( 40 0 0 10 17);测绘遥感信息工程国家重点实验室开放研究基金资助项目 (WKL( 0 2 ) 0 30 1);国家"863"计划资助项目 ( 2 0 0 2AA716131)

摘　　要：通过对目前国内外几种典型GIS软件的几何量算模型比较研究 ,提出距离、面积、周长等在不同条件下适用的几何量算模型。试验分析证明 ,弦线法与等积投影法对于大范围内距离与面积的量算效果理想 ,其量算精度与区域大小。Up to now,various scales of national fundamental spatial data are available with ease,so it is very urgent to integrate so much data in a unified geographic coordinate system for social services.However,the traditional GIS functions are specially developed for local plane coordinates system,such as the calculation of distance and area.In fact,because of the quite different principles between the plane system and curve system,it is impossible to simply use the traditional methods for geometric measurements.In this paper,for the representation of geographic data in the referential ellipse's earth core geodetic datum,the calculations of two basic geometric measurements of distance and area are analyzed through experiments.First,the limitation of using plane surface instead of curve surface is analyzed concerning with different covering ranges and scales,then the geometric measurements on the curve surface are tested.

关 键 词：参心大地坐标系 几何量算 弦线法 等积投影 地形空间属性 

分 类 号：P226.3[天文地球—大地测量学与测量工程] P208[天文地球—测绘科学与技术]