[R] Overlaying maps

[Ray Brownrigg]

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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