经纬度算距离C源码

最新推荐文章于 2024-06-03 14:45:35 发布

jiadelin

最新推荐文章于 2024-06-03 14:45:35 发布

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本文提供了两种使用C语言计算地球表面两点间距离的方法。通过经纬度应用球面三角公式和哈弗赛恩公式，实现精确的距离计算，并展示了具体示例。

#include "stdafx.h"
#include <stdio.h>
#include <math.h>
#define EARTH_RADIUS  6371.004

#define PI 3.1415926

double rad(double d)

{

   return d * PI / 180.0;

}



double getDistanceVer1(double lat1, double lng1, double lat2, double lng2)

{

   double radLat1 = rad(lat1);

   double radLat2 = rad(lat2);

   double radLng1 = rad(lng1);

   double radLng2 = rad(lng2);

   double s = acos(sin(radLat1)*sin(radLat2)+cos(radLat1)*cos(radLat2)*cos(radLng1-radLng2));

   s = s * EARTH_RADIUS;

   return s;

}



double getDistanceVer2(double lat1, double lng1, double lat2, double lng2)

{

   double radLat1 = rad(lat1);

   double radLat2 = rad(lat2);

   double a = radLat1 - radLat2;

   double 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;

   return s;

}



int main(int argc, char** argv)
{

double lat1,lng1,lat2,lng2,distance1, distance2;
lat1 = 113.602525;
lng1 = 34.768901926;
lat2 = 113.69516016;
lng2 = 34.755820614175;
printf("using Version 1:\n");
distance1=getDistanceVer1(lat1,lng1,lat2,lng2);
printf("the distance is %f Km:\n",distance1);
printf("using Version 2:\n");
distance2=getDistanceVer2(lat1,lng1,lat2,lng2);
printf("the distance is %f Km:\n",distance2);
return 0;
}