地理空間距離計算及優化（根據兩個點經緯度計算距離）

https://blog.csdn.net/u011001084/article/details/52980834

 

http://www.cnblogs.com/softfair/p/distance_of_two_latitude_and_longitude_points.html

 

 

https://www.cnblogs.com/softfair/p/lat_lon_distance_bearing_new_lat_lon.html