AltosLatLon ul = transform.lat_lon(point);
AltosLatLon center = transform.lat_lon(new AltosPointDouble(x + AltosMap.px_size/2, y + AltosMap.px_size/2));
AltosMapTile tile = map_interface.new_tile(cache, ul, center, zoom, maptype, px_size, scale);
AltosLatLon ul = transform.lat_lon(point);
AltosLatLon center = transform.lat_lon(new AltosPointDouble(x + AltosMap.px_size/2, y + AltosMap.px_size/2));
AltosMapTile tile = map_interface.new_tile(cache, ul, center, zoom, maptype, px_size, scale);