再论采用双重投影法的椭球面日晷投影  

The Re-discussion on Ellipsoidal Gnomonic Projection by Double Projection Method

作　　者：华棠 边少锋[2] 丁佳波 李厚朴[2] HUA Tang;BIAN Shaofeng;DING Jiabo;LI Houpu(Naval Research Academy,Tianjin 300061,China;Department of Navigation,Naval University of Engineering,Wuhan 430033,China;Chart Information Center,Tianjin 300450,China)

机构地区：[1]海军研究院,天津300061 [2]海军工程大学导航工程系,湖北武汉430033 [3]海图信息中心,天津300450

出　　处：《海洋测绘》2020年第2期19-22,共4页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(41771487,41871376,41671459);湖北省杰出青年科学基金(2019CFA086)。

摘　　要：为减小椭球面日晷投影的变形,讨论了椭球面日晷投影的特性,分析了3种球面下双重投影法的变形大小,结果表明采用高斯等角球面,投影长度变形最小,适合于各种比例尺的地图海图制图,可以使船只沿着拟大地线方向航行,迅速到达目的地。In order to reduce the distortion of ellipsoidal gnomonic projection,the important characteristics of ellipsoidal gnomonic projection is discussed,and the distortion degree by double projection method under three spheres is analyzed.The results show that the length distortion of Gauss conformal sphere method is minimum,which is suitable for mapping and charting with various scales.The ship can navigate along the approximate geodetic line,and arrive at the destination quickly.

关 键 词：海图投影 日晷投影 任意性质双重投影 高斯等角球面 拟大地线 

分 类 号：P282[天文地球—地图制图学与地理信息工程]