[R] Overlaying maps
Ray Brownrigg
Ray.Brownrigg at ecs.vuw.ac.nz
Wed May 18 22:12:33 CEST 2011
Using my mind-reading skills, plot.Map(), while deprecated, does provide an add= option.
If this doesn't help, you'll need to read the posting guide and provide (a lot) more
information.
Ray Brownrigg
On Thu, 19 May 2011, Michael.Laviolette at dhhs.state.nh.us wrote:
> I'm having difficulty overlaying maps when writing to a file graphics
> device. My command sequence has the structure
>
> plot(map1)
> par(new = T)
> plot(map2)
>
> On the screen device, it works fine. When I attempt something like
>
> png(file = "map.png")
> plot(map1)
> par(new = T)
> plot(map2)
> dev.off()
>
> only the last map appears, the previous ones having been cleared. Can
> someone clarify?
>
> Thanks,
> Michael Laviolette PhD MPH
> New Hampshire Department of Health and Human Services
>
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html and provide commented,
> minimal, self-contained, reproducible code.
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