客户端具有以用户查询的点为中心显示地图以及计算两点距离的功能。
The client has two main functions, one is displaying a map with the center of the user request, the other is calculating the distance of two points.
大圆弧长计算球面两点之间的最短距离。
The great-circle distance calculates the shortest distance between any two points on the surface of a sphere.
如何计算纬度和经度指定的两点之间的距离？
How do I calculate the distance between two points specified by latitude and longitude?
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