두 좌표(위도, 경도) 거리계산 - c언어 example

두 위경도 좌표 간의 거리 계산은 지구가 둥글기 때문에 어느정도 오차가 있을 수 있다.

#include "stdafx.h"

#define _USE_MATH_DEFINES

#include "math.h"

class LatLong {

public:

double latitude = 0;

double longitude = 0;

LatLong(double _lat, double _long) {

latitude = _lat;

longitude = _long;

}

};

// return : KM

double calcDistance(LatLong start, LatLong end) {

double distance = 0;

double startLatitudeRadian = start.latitude * M_PI / 180;   // M_PI = 3.141592..

double startLongitudeRadian = start.longitude * M_PI / 180;

double endLatitudeRadian = end.latitude * M_PI / 180;

double endLongitudeRadian = end.longitude * M_PI / 180;

distance = acos(sin(startLatitudeRadian) * sin(endLatitudeRadian) + cos(startLatitudeRadian) * cos(endLatitudeRadian) * cos(endLongitudeRadian - startLongitudeRadian));

distance = distance * 6371; 

return distance;

}

int main()

{

LatLong test1(37.514055, 127.033377);

LatLong test2(35.846386, 128.577047);

printf("test1, test2 : %f km\n", calcDistance(test1, test2)); // real : 230.94 km, calc : 230.938536 km

    return 0;

}

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참고 :
https://tonyne.jeju.onl/2016/04/14/oracle-lat-lng-distnace-query/
http://linuxism.tistory.com/781