This world database comes from a cleaned-up version of the CIA
World Data Bank II data and contains approximately 2 million points
representing the world coastlines and national boundaries. This
makes it suitable for extracting countries, continents, etc. while
still retaining lots of detail.
The ‘world2’ database is a modified version of the ‘world’ database
in which the longitude ranges from 0 through 360 degrees, instead of
-180 through 180. This then allows maps of the whole Pacific Ocean for
example.
Usage
data(worldHiresMapEnv)
Format
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.