[R] Fwd: only plot borders of a region in a scatter plot

Zun Yin yinzun2000 at gmail.com
Thu Aug 4 10:51:22 CEST 2016

ear all,

I have a matrix with ID of river basins (integer numbers). Now I want to
highlight one river basin in a map by plotting only the border. Like the
attached figure. Two river basins are highlighted by polygons. It is
created by ferret, but I prefer to implement it by R. Anybody know how to
do it? Thanks a lot.


Zun Yin
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