[R] mapping groups of states without interior borders

[Bert Gunter]

Presumably this is in the package maps?? -- you need to specify such
details when referring to non-base R functionality.

In any case, you are more likely to get a helpful response if you post to
the  r-sig-geo list, which specialized in such spatial statistics/graphics
questions.


Cheers,
Bert



Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Mon, May 21, 2018 at 10:02 AM, Simon, Heather <Simon.Heather using epa.gov>
wrote:

> I have been using the "map" function in R and I was wondering if there is
> a way to map multi-state regions just showing the outline of the region
> without interior state borders.  For instance, I am calculating aggregated
> statistics using 10 multi-state regions.  I would like to color-code
> individual states based on my dataset but then to create black outlines
> around each of these 10 regions so that the map shows the delineations of
> the various regions for which I am reporting aggregated statistics.
>
> When I use:
> map('state', region = "Idaho", "Washington", "Oregon", add = TRUE, color =
> "black")
> I get a plot that includes interior boundaries between these 3 states
> instead of an exterior border around this region.
>
> Thanks,
> Heather
>
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