[R] heat map - how to import a graphic?

[David Winsemius]

On Nov 28, 2011, at 1:22 PM, alison korte wrote:

> If I want to create a heat map where I have a graphic of a US State  
> with county borders, how do I import and work with the graphic image?
> The reason I would like to use R is so I can then define color  
> parameters and quickly produce heat maps that correspond to various  
> data in dataframes.

You should be searching on the term "choropleth map". Or to give  
google better directions use:

choropleth map r:language

The are quite a few examples in the archives, on the web, and in  
various geospatial packages. Happy searching.

-- 

David Winsemius, MD
West Hartford, CT