获取两个坐标点的距离

Posted 2020-06-08

 /// <summary>         /// 获取两个坐标点的距离        

/// </summary>        

/// <param name="lat1">坐标1的维度</param>        

/// <param name="lng1">坐标1的经度</param>        

/// <param name="lat2">坐标2的维度</param>        

/// <param name="lng2">坐标2的经度</param>        

/// <returns>返回两点间的距离，单位米</returns>        

public static double GetDistance(decimal lat1, decimal lng1, decimal lat2, decimal lng2)        

{           

  double radLat1 = rad((double)lat1);     

        double radLat2 = rad((double)lat2);     

        double a = radLat1 - radLat2;  

           double b = rad((double)lng1) - rad((double)lng2);

            double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));             s = s * EARTH_RADIUS;    

         s = Math.Round(s * 10000) / 10000;       

      return s;    

     }    

}

}