file_drawer: Manage the ggmap file drawer.
In fresques/ggmap: Spatial Visualization with ggplot2

To avoid downloading the same maps again and again, ggmap uses a "file drawer" to store the maps you've downloaded. By default, they will be stored in a session specific temporary directory which will be deleted each time you quit R. If you want them to persist across sessions, set the global option "ggmap.file_drawer".

1	file_drawer(...)

## Not run: # if server is unresponsive, R check will fail

file_drawer()
dir(file_drawer())

# The first time you run this, the tiles are downloaded from the server
map <- get_stamenmap()
# The second time, the local cache is used so it's much faster
map <- get_stamenmap()

dir(file_drawer())


## End(Not run)