/**
* Start a new {@link BulkRetrievalThread} that downloads all placenames for a given sector and
* resolution to a specified file store.
*
* <p>This method creates and starts a thread to perform the download. A reference to the thread
* is returned. To create a downloader that has not been started, construct a {@link
* PlaceNameLayerBulkDownloader}.
*
* <p>Note that the target resolution must be provided in radians of latitude per texel, which is
* the resolution in meters divided by the globe radius.
*
* @param sector the sector to download data for.
* @param resolution the target resolution, provided in radians of latitude per texel.
* @param fileStore the file store in which to place the downloaded elevations. If null the
* current World Wind file cache is used.
* @param listener an optional retrieval listener. May be null.
* @return the {@link PlaceNameLayerBulkDownloader} that executes the retrieval.
* @throws IllegalArgumentException if the sector is null or the resolution is less than zero.
* @see PlaceNameLayerBulkDownloader
*/
public BulkRetrievalThread makeLocal(
Sector sector, double resolution, FileStore fileStore, BulkRetrievalListener listener) {
PlaceNameLayerBulkDownloader thread =
new PlaceNameLayerBulkDownloader(this, sector, resolution, fileStore, listener);
thread.setDaemon(true);
thread.start();
return thread;
}
