Thank you, Ray!  That worked.

Thank you also, Yihui.  I tried your subplot() suggestion, but couldn't 
get it to work with a map() on a map()

Jean


Ray Brownrigg <Ray.Brownrigg@ecs.vuw.ac.nz> wrote on 09/27/2011 07:26:34 
PM:
> 
> On Wed, 28 Sep 2011, Jean V Adams wrote:
> > I want to overlay a small inset map on top of another map, but I can't
> > figure out how to do it.
> > For example, here are two different maps:
> > 
> > # map 1 - Ohio
> > map("state", region= "ohio")
> > 
> > # map 2 - US with Ohio darkened
> > map("state")
> > map("state", region="ohio", fill=T, add=T)
> > 
> > I would like to add map 2 as a small inset in the corner of map 1.
> > I have tried:
> > 
> > map("state", region= "ohio")
> > par(new=TRUE, mar=c(3, 3, 15, 15))
> > map("state")
> > map("state", region="ohio", fill=T, add=T)
> > 
> > but this seems to erase map 1 and replace it with a full size version 
of
> > map 2.
> > 
> > I can successfully overlay an unrelated plot using similar code:
> > 
> > map("state", region= "ohio")
> > par(new=TRUE, mar=c(3, 3, 15, 15))
> > plot(1:10, 1:10)
> > 
> > So, there must be something about the maps() function that I'm 
tripping
> > over.
> 
> I think the problem is that map() 'insists' (in some sense) on a 
> clean frame so it can get 
> the aspect ratio right.
> 
> > 
> > Any suggestions?
> > 
> How about something like:
> map("state", region= "ohio", xlim=c(-85, -80), ylim=c(38, 42))
> par(usr=c(-216, -66, 24, 144))      # you should be able to 
> 'automate' this calculation
> map("state", add=T)
> map("state", region="ohio", fill=T, add=T)
> 
> HTH
> Ray Brownrigg
> 
> > I am using R for Windows 2.13.0
> > and the maps package version 2.1-5.
> > 
> > Jean
> > 
> > 
> > `�.,,  ><(((�>   `�.,,  ><(((�>   `�.,,  ><(((�>
> > 
> > Jean V. Adams
> > Statistician
> > U.S. Geological Survey
> > Great Lakes Science Center
> > 223 East Steinfest Road
> > Antigo, WI 54409  USA
> 
> 


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