mapping groups of states without interior borders
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 at 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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