[R] how to overlay a map of US on image plot

[Greg Snow]

You may want to use the ggplot2 package for this (see ?coord_map), it can combine maps and other plots and does a lot of the thinking about scaling and projections for you.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of cassie jones
> Sent: Sunday, February 13, 2011 7:15 PM
> To: r-help at r-project.org
> Subject: [R] how to overlay a map of US on image plot
> 
> Dear all,
> 
> I have a data set which has latitude, longitude (not in increasing
> order)
> and observed precipitation corresponding to those locations. I am using
> image.plot command for that. But I want to overlay a map of US on that
> plot.
> I know we can use map('usa') to draw it, but I dont know how can I
> overlay
> it on the plot of the precipitation data. Can anyone please help me
> with it?
> 
> 
> Thanks in advance.
> 
> Cassie.
> 
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> 
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