计算地球上两点间的距离算法代码

计算地球上两点间的距离算法代码

constdoubleEARTH_RADIUS = 6378.137;

staticdoublerad(doubled)

{

returnd * PI/ 180.0;

}

+(double)GetDistance:(double) lat1:( double) lng1:(double)lat2:( double) lng2

{

doubleradLat1 = rad(lat1);

doubleradLat2 = rad(lat2);

doublea = radLat1 - radLat2;

doubleb = rad(lng1) - rad(lng2);

doubles = 2*sin(sqrt(pow(sin(a/2),2) + cos(radLat1)*cos(radLat2)*pow(sin(b/2),2)));

s = s * EARTH_RADIUS;

s = round(s * 1000);

return s;

}

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