计算两个经纬度坐标点的距离C++

#include
#include "math.h"
using namespace std;
#define pi 3.1415926535897932384626433832795
#define EARTH_RADIUS 6378.137 //地球半径 KM
double rad(double d)
{
    return d * pi /180.0;
}
double RealDistance(double lat1,double lng1,double lat2,double lng2)//lat1第一个点纬度,lng1第一个点经度,lat2第二个点纬度,lng2第二个点经度
{
	
	double a;
   	double b;
   	double radLat1 = rad(lat1);
   double radLat2 = rad(lat2);
   a = radLat1 - radLat2;
   b = rad(lng1) - rad(lng2);
   double s = 2 * asin(sqrt(pow(sin(a/2),2) + cos(radLat1)*cos(radLat2)*pow(sin(b/2),2)));
    s = s * EARTH_RADIUS;
    s = s * 1000;
    return s;
}
 
int main()
{
   cout<

程序中计算的是图中两点的距离，结果为672.767m。计算距离只需调用函数RealDistance即可

参考：https://www.douban.com/note/299046300/