toys/gps/docs/wgs84ToUtm.cpp

//经纬度转utm坐标
int convert_lonlat_utm(const new3s_PointXYZ &lon_lat_coord, new3s_PointXYZ &utm_coord)
{
    OGRSpatialReference *RefSource = new OGRSpatialReference;
    RefSource->SetWellKnownGeogCS("WGS84");

    OGRSpatialReference *RefTarget = new OGRSpatialReference;
    RefTarget = RefSource->CloneGeogCS();
    int utmzone = lon_lat_coord.get_x() / 6 + 31;
    RefTarget->SetProjCS("UTM(WGS84) in northern hemisphere.");
    RefTarget->SetUTM(utmzone, TRUE);
    OGRCoordinateTransformation *poTransform = OGRCreateCoordinateTransformation(RefSource, RefTarget);

    double tempX = lon_lat_coord.get_x();
    double tempY = lon_lat_coord.get_y();
    double tempZ = lon_lat_coord.get_z();

    poTransform->Transform(1, &tempX, &tempY, &tempZ);
    utm_coord.set_x(tempX);
    utm_coord.set_y(tempY);
    utm_coord.set_z(tempZ);

    return utmzone;
}
//utm转经纬度
void convert_utm_lonlat(const new3s_PointXYZ &utm_coord, const int &utmzone, new3s_PointXYZ &lon_lat_coord)
{
    //建立投影坐标系到经纬度坐标系的转换
    OGRSpatialReference *RefSource = new OGRSpatialReference;
    RefSource->SetWellKnownGeogCS("WGS84");
    RefSource->SetProjCS("UTM(WGS84) in northern hemisphere.");
    RefSource->SetUTM(utmzone, TRUE);
    OGRSpatialReference *RefTarget = new OGRSpatialReference;
    RefTarget = RefSource->CloneGeogCS();
    OGRCoordinateTransformation *poTranform = OGRCreateCoordinateTransformation(RefSource, RefTarget);

    OGRPoint *poPoint = new OGRPoint();
    double tempx = utm_coord.get_x();
    double tempy = utm_coord.get_y();
    double tempz = utm_coord.get_z(); 

    poTranform->Transform(1, &tempx, &tempy, NULL);
    lon_lat_coord = new3s_PointXYZ(tempx, tempy, tempz);
}

(CGPoint)lonLat2Mercator:(CGPoint) lonLat
{
    CGPoint  mercator;
    double x = lonLat.x *20037508.34/180;
    double y = log(tan((90+lonLat.y)*M_PI/360))/(M_PI/180);
    y = y *20037508.34/180;
    mercator.x = x;
    mercator.y = y;
    return mercator ;
}

(CGPoint)Mercator2lonLat:(CGPoint) mercator
{
    CGPoint lonLat;
    double x = mercator.x/20037508.34*180;
    double y = mercator.y/20037508.34*180;
    y= 180/M_PI*(2*atan(exp(y*M_PI/180))-M_PI/2);
    lonLat.x = x;
    lonLat.y = y;
    return lonLat;
}