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only plot borders of a region in a scatter plot

Zun Yin 
?D?
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.

Cheers,

Zun Yin
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Thread (8 messages)

Zun Yin only plot borders of a region in a scatter plot Aug 4 William Dunlap only plot borders of a region in a scatter plot Aug 4 Duncan Murdoch only plot borders of a region in a scatter plot Aug 4 Bert Gunter only plot borders of a region in a scatter plot Aug 4 Zun Yin only plot borders of a region in a scatter plot Aug 4 Duncan Murdoch only plot borders of a region in a scatter plot Aug 4 Jim Lemon only plot borders of a region in a scatter plot Aug 4 Jim Lemon only plot borders of a region in a scatter plot Aug 4