说明：  测地线又名 测地线又称大地线或短程线，可以定义为空间中两点的局域最短或最长路径。测地线(geodesic)的名字来自于对于地球尺寸与形状的大地测量学(geodesy)。
(Aka geodesic geodesic lines or short lines, also known as the earth, the space can be defined as the local minimum or maximum two paths. Geodesic (geodesic) takes its name from the shape of the Earth s size and Geodesy (geodesy).)