This plugin caches terrain tiles, feature vectors, and other data to the local file system in a hierarchy of folders. Each cached data element is in a separate file, and may include an associated metadata file.
<map> <options> <cache driver="filesystem"> <path>c:/osgearth_cache</path> </cache> ...
The ``filesystem`` cache stores each class of data in its own ``bin``. Each ``bin`` has a separate directory under the root path. osgEarth controls the naming of these bins, but you can use the ``cache_id`` property on map layers to customize the naming to some extent. This cache supports expiration, but does NOT support size limits -- there is no way to cap the size of the cache. Cache access is serialized since we are reading and writing individual files on disk. Accessing the cache from more than one process at a time may cause corruption. The actual format of cached data files is "black box" and may change without notice. We do not intend for cached files to be used directly or for other purposes.
path: Location of the root directory in which to store all cache bins and files.