摘要
利用等距离纬度、等角纬度和等面积纬度这三种纬度和大地纬度间的正反解展开式,全面导出了它们之间变换的直接展开式,并将式中系数统一表示为椭球偏心率e的幂级数形式并展至e10,解决了不同参考椭球下的变换问题。算例分析表明,直接展开式的计算精度优于10-8″,满足地图投影精密计算的需要。
Considering the traditional transformations between rectifying, conformal and authalic latitudes are comparatively fuzzy, the direct expansions of transformations between three kinds of latitudes are comprehensively derived with the help of computer algebra system Mathematica using the forward and inverse expansions of transformations between the three kinds of latitudes and geodetic latitude. Their coefficients are expressed in a power series of the ellipsoid＇s first eccentricity, e, and extended up to tenth-order terms of e, which could solve the transformation problem when different reference ellipsoids are used. Numerical examples show that the accuracies of these direct expansions are higher than 10-8＂, and could completely meet the needs of precise calculation in map projection.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2013年第2期217-220,共4页
Geomatics and Information Science of Wuhan University
基金
国家973计划资助项目(2012CB719902)
国家自然科学基金资助项目(40904018
41071295)
国家自然科学基金青年科学基金资助项目(41201478)
海岛(礁)测绘技术国家测绘地理信息局重点实验室资助项目(2010B04)
关键词
地图投影
等距离纬度
等角纬度
等面积纬度
直接展开式
计算机代数系统
map projection rectifying latitude expansions computer algebra system conformal latitude
authalic latitude
direct
