OGRLineString  * convertFromGEOStoOGR(LineString * ls) {
    OGRLineString * lineString = (OGRLineString*) OGRGeometryFactory::createGeometry(wkbLineString);
    for(int i = 0; i < ls->getNumPoints(); ++i) {
        Point * pt = ls->getPointN(i);
        lineString->addPoint(pt->getX(), pt->getY());
    }
    return lineString;
}