Tilecache 是一个地图瓦片缓存器，大大提高访问地图的响应速度，只有当请求的地图不在tiles之列时，才与wms等其他服务交互请求地图，消耗空间服务器资源。-Tilecache a map tile cache, greatly improve the response speed of the access map, only when requested map is not the tiles out before they request the map the wms other