计算两个经纬度之间的实际距离(Haversine公式)----c++

来源:https://www.open-open.com/lib/view/open1430573897802.html

原理亦可参考:https://blog.csdn.net/gaocuisheng/article/details/126060795

#include <cmath>
#define EARTH_RADIUS  6371.0;// 地球半径，单位千米

static double HaverSin(double theta)
{
    double v = sin(theta / 2);
    return v * v;
}

static double ConvertDegreesToRadians(double degrees)
{
    return degrees * M_PI / 180;
}

	/// <summary>
	/// 计算2个经纬度之间的距离
	/// </summary>
	/// <param name="from_lon">起始点经度</param>
	/// <param name="from_lat">起始点纬度</param>
	/// <param name="to_lon">目标点经度</param>
	/// <param name="to_lat">目标点纬度</param>
	/// <returns></returns>
static double TwoPointDistance(double from_lon, double from_lat, double to_lon, double to_lat)
{
    // 用 haversine 公式计算球面两点间的距离。
    // 经纬度转换成弧度
    from_lon = ConvertDegreesToRadians(from_lon);
    from_lat = ConvertDegreesToRadians(from_lat);
    to_lon = ConvertDegreesToRadians(to_lon);
    to_lat = ConvertDegreesToRadians(to_lat);
    // 差值
    double vLon = std::abs(from_lon - to_lon);
    double vLat = std::abs(from_lat - to_lat);
    // h is the great circle distance in radians, great circle 就是一个球体上的切面，它的圆心即是球心的一个周长最大的圆。
    double h = HaverSin(vLat) + cos(from_lat) * cos(to_lat) * HaverSin(vLon);
    auto sh = sqrt(h);
    double distance = 2 * (asin(sqrt(h))) * EARTH_RADIUS;

    // 将距离转换为米
    distance *= 1000;

    return distance;
}

int main() {
    // 39.94607,116.32793  31.24063,121.42575
    std::cout << TwoPointDistance(39.94607, 116.32793, 31.24063, 121.42575) << " meters" << std::endl;

    return 0;
}