采用双重投影法的椭球面日晷投影

详细信息

Ellipsoidal Gnomonic Projection by Double Projection Method

摘要: 研究了从地球椭球面描写到海图平面的采用双重投影法的日晷投影方程式,并阐明了椭球面日晷投影的 3个重要特性及其应用。
- 大椭圆 /
- 共焦双曲线 /
- 椭球面日晷投影
Abstract: Chinese Nautical Chart requests that gnomonic projection should be used if over 60% of the area latitude is over 75°。In this paper,the gnomonic projection equation from the earth ellipsoid to the surface of projection is derived by double projection method.The three important characteristics and application of the ellipsoidal gnomonic projection are described.
- great ellipse /
- hyper-bola of common focus /
- ellipsoidal gnomonic projection