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 it