@Override
public void startElement(String namespaceURI, String localname, String tagname, Attributes attributes) throws SAXException {
if (Bounds == null)
Bounds = new UTMPoint(0, 0, 0);
if (tagname.equals("node")) {
bNode = true;
int id = Integer.parseInt(attributes.getValue("id"));
UTMPoint GPSPoint = convert(Double.parseDouble(attributes.getValue("lat")), Double.parseDouble(attributes.getValue("lon")));
nd_obj = new Knoten(id, new Point2D.Double(GPSPoint.getX() - Bounds.getX(), -1 * (GPSPoint.getY() - Bounds.getY())));
vertices.add(nd_obj);
} else if (tagname.equals("tag")) {
if (bNode) {