public AltosMapTile(AltosMapTileListener listener, AltosLatLon upper_left, AltosLatLon center, int zoom, int maptype, int px_size) {
this.listener = listener;
this.upper_left = upper_left;
public AltosMapTile(AltosMapTileListener listener, AltosLatLon upper_left, AltosLatLon center, int zoom, int maptype, int px_size) {
this.listener = listener;
this.upper_left = upper_left;