R help - Nov 2009 - interior and exterior colors of a map

Hi useR's,
I have an image plot I want to overlay a map of the United States on, via
map('usa').  The image is basically a large rectangular of various
colors.
When I overlay the United States map, the full rectangle of the image plot
is visible, but I only want to display the image WITHIN the United States
boundary.
Does anyone know a way to do this?
Thanks in advance,

dxc13
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Paul Murrell offered some worked examples of using paths from vector  
graphics in the articles and talks he has given for the grImport  
package:

http://www.stat.auckland.ac.nz/~paul/Talks/import.pdf

http://www.jstatsoft.org/v30/i04

http://cran.r-project.org/web/packages/grImport/grImport.pdf

-- 
David

On Nov 24, 2009, at 10:45 PM, dxc13 wrote:
>
> Hi useR's,
> I have an image plot I want to overlay a map of the United States  
> on, via
> map('usa').  The image is basically a large rectangular of various
> colors.
> When I overlay the United States map, the full rectangle of the  
> image plot
> is visible, but I only want to display the image WITHIN the United  
> States
> boundary.
> Does anyone know a way to do this?
> Thanks in advance,
>
> dxc13
> -- 
> View this message in context:
http://old.nabble.com/interior-and-exterior-colors-of-a-map-tp26507134p26507134.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT