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

[William Dunlap]

If 'basinID' is the matrix of basin identifiers you could draw an outline
of the basin with identifier 'ID' with
   coutour( basiinID == ID, level=0.5)
Add 'add=TRUE' if you are overlaying this on an existing plot.

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Thu, Aug 4, 2016 at 1:51 AM, Zun Yin <yinzun2000 at gmail.com> wrote:

> ​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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