[转]WebMercator与经纬度互转

//经纬度转Web墨卡托
Vector3 lonLat2WebMercator(Vector3  lonLat)
{
    Vector3  mercator;
    double x = lonLat.x *20037508.34 / 180;
    double y = log(tan((90 + lonLat.y)*3.14 / 360)) / (3.14 / 180);
    y = y *20037508.34 / 180;
    mercator.x = x;
    mercator.y = y;
    return mercator;
}
//Web墨卡托转经纬度
Vector3 WebMercator2lonLat(Vector3   mercator)
{
    Vector3 lonLat;
    double x = mercator.x / 20037508.34 * 180;
    double y = mercator.y / 20037508.34 * 180;
    y = 180 / 3.14*(2 * atan(exp(y*3.14 / 180)) - 3.14 / 2);
    lonLat.x = x;
    lonLat.y = y;
    return lonLat;
}