지구 좌표계 (WGS - 84) 에서 화성 좌표계 (GCJ - 02) 로 의 전환 알고리즘 C 언어

Mark  ，      。 

http://blog.csdn.net/coolypf/article/details/8686588





   C++  ：

#include





const double pi = 3.14159265358979324;





//

// Krasovsky 1940

//

// a = 6378245.0, 1/f = 298.3

// b = a * (1 - f)

// ee = (a^2 - b^2) / a^2;

const double a = 6378245.0;

const double ee = 0.00669342162296594323;





 static bool outOfChina(double lat, double lon)

{

    if (lon < 72.004 || lon > 137.8347)

        return true;

    if (lat < 0.8293 || lat > 55.8271)

        return true;

    return false;

}





static double transformLat(double x, double y)

{

    double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(abs(x));

    ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;

    ret += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;

    ret += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0;

    return ret;

}





static double transformLon(double x, double y)

{

    double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(abs(x));

    ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;

    ret += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;

    ret += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;

    return ret;

}





void gps_transform( double wgLat, double wgLon, double& mgLat, double& mgLon)

{

if (outOfChina(wgLat, wgLon))

        {

            mgLat = wgLat;

            mgLon = wgLon;

            return;

        }

        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);

        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);

        double radLat = wgLat / 180.0 * pi;

        double magic = sin(radLat);

        magic = 1 - ee * magic * magic;

        double sqrtMagic = sqrt(magic);

        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);

        dLon = (dLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi);

        mgLat = wgLat + dLat;

        mgLon = wgLon + dLon;

};