已知两点的经度、纬度，计算两点的距离

const double EARTH_RADIUS = 6378137;//地球半径 /// <summary> /// 计算由经纬度给出两点的距离 /// </summary> /// <param name="Lat1">点一纬度</param> /// <param name="Lon1">点一经度</param> /// <param name="Lat2">点二纬度</param> /// <param name="Lon2">点二经度</param> /// <returns>两点之间以海里为单位的距离</returns> public static double ComputeD(double Lat1, double Lon1, double Lat2, double Lon2) { if (Lat1 < -90 || Lat1 > 90) { MessageBox.Show("纬度值输入错误！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); return -9999; } if (Lon1 < -180 || Lon1 > 180) { MessageBox.Show("经度值输入错误！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); return -9999; } if (Lat2 < -90 || Lat2 > 90) { MessageBox.Show("纬度值输入错误！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); return -9999; } if (Lon2 < -180 || Lon2 > 180) { MessageBox.Show("经度值输入错误！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); return -9999; } double radLat1 = rad(Lat1); double radLat2 = rad(Lat2); double a = radLat1 - radLat2; double b = rad(Lon1) - rad(Lon2); double Dis = 2 * Math.Asin(Math.Sqrt(Math.Sin(a / 2) * Math.Sin(a / 2) + Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Sin(b / 2) * Math.Sin(b / 2))); Dis = Dis * EARTH_RADIUS; return Dis ;//米 }