iSelectionRectStart = new Point(Math.min(x1, x2), Math.min(y1, y2));
iSelectionRectEnd = new Point(Math.max(x1, x2), Math.max(y1, y2));
// calc the screen coordinates for the new selection rectangle
MapMarkerDot xmin_ymin = new MapMarkerDot(bbox.getMinLat(), bbox.getMinLon());
MapMarkerDot xmax_ymax = new MapMarkerDot(bbox.getMaxLat(), bbox.getMaxLon());
List<MapMarker> marker = new ArrayList<>(2);
marker.add(xmin_ymin);
marker.add(xmax_ymax);
setMapMarkerList(marker);