Add a frame to a map

April 2, 2012
By

(This article was first published on me nugget, and kindly contributed to R-bloggers)

Here is a function that adds a frame of alternating colors to a map (un-projected). One defines the extension of each bar (in degrees) and an optional width of the bars (in inches). It uses the "joinPolys" function of the package to trim the bars near the map corners where the axes meet.

the map.frame function:
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