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.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
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)
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
referential ellipse's earth core geodetic datum
geometry measurement
chord_line method
equal_area projection
