final Rectangle2D bnd = bounds.getBounds();
final Projection proj = new OrthographicAzimuthalProjection();
proj.setProjectionLongitudeDegrees(bnd.getX() + bnd.getWidth()/2);
proj.setProjectionLatitudeDegrees(bnd.getY() + bnd.getHeight()/2);
proj.initialize();
return proj;
}
public void add(GpxType gpx) throws GPXVisitorException{
visitor.visit(gpx);