Low (mid) resolution World Map
This updated (2013) world map is imported from the Natural Earth project (the 1:50m resolution version). It replaces a much older version based on the CIA World Data Bank II data.
That older version is still included in the package and can reached as
As of version 3.1, the
world database no longer contains any lakes. These have been moved to a separate database called
The data file is merely 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_MAP_DATA_DIR_WORLD) is set at package load time if it does not
already exist. Hence setting the environment variable before loading
the package can override the default location of the binary datasets.
During a transition period (
maps version 3.0--1) it is possible to switch to the old legacy map using the function
world.legacy(TRUE) or by setting the setting the environment variable R_MAP_DATA_LEGACY=TRUE prior to loading the package.
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.
# notice how some polygons extend beyond the [-180,180] interval: map('world', fill = TRUE, col = 1:10) # if you wrap at [-180,180], you also can get a clean closure of Antarctica map('world', fill = TRUE, col = 1:10, wrap=c(-180,180) )