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iOS 2個(gè)坐標(biāo)之間的距離

發(fā)布時(shí)間：2020-07-19 11:39:38 來(lái)源：網(wǎng)絡(luò) 閱讀：442 作者：大頭狼小鬼 欄目：移動(dòng)開(kāi)發(fā)

// 計(jì)算兩坐標(biāo)之間的距離

double distanceWithcoord(double lon1,double lat1,double lon2,double lat2)

{

    double er = 6378137;

    double radlat1 = PI*lat1/180.0f;

    double radlat2 = PI*lat2/180.0f;

    double radlong1 = PI*lon1/180.0f;

    double radlong2 = PI*lon2/180.0f;

    if( radlat1 < 0 ) radlat1 = PI/2 + fabs(radlat1);// south

    if( radlat1 > 0 ) radlat1 = PI/2 - fabs(radlat1);// north

    if( radlong1 < 0 ) radlong1 = PI*2 - fabs(radlong1);//west

    if( radlat2 < 0 ) radlat2 = PI/2 + fabs(radlat2);// south

    if( radlat2 > 0 ) radlat2 = PI/2 - fabs(radlat2);// north

    if( radlong2 < 0 ) radlong2 = PI*2 - fabs(radlong2);// west


    double x1 = er * cos(radlong1) * sin(radlat1);

    double y1 = er * sin(radlong1) * sin(radlat1);

    double z1 = er * cos(radlat1);

    double x2 = er * cos(radlong2) * sin(radlat2);

    double y2 = er * sin(radlong2) * sin(radlat2);

    double z2 = er * cos(radlat2);

    double d = sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+(z1-z2)*(z1-z2));

    

    double theta = acos((er*er+er*er-d*d)/(2*er*er));

    double dist  = theta*er;

    return dist;

}


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