This database produces a map of Japan, including prefecture boundaries.
The data file is merely an assignment to a character string which
specifies the name of an environment variable which contains the
base location of the binary files used by the map drawing functions.
This environment variable (
R_MAPDATA_DATA_DIR for the datasets in the
mapdata package) is set at package load time.
Thanks to Ritei Shibata of Keio University for the formatted data.
Richard A. Becker, and Allan R. Wilks, "Maps in S", AT\&T Bell Laboratories Statistics Research Report [93.2], 1993.
Richard A. Becker, and Allan R. Wilks, "Constructing a Geographical Database", AT\&T Bell Laboratories Statistics Research Report [95.2], 1995.
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