[R] how to add US map to basic plot

[Roger Bivand]

On Mon, 17 Apr 2006, YouLong Xia wrote:

> Dear my colleagues,
> 
> I am drawing US  land surafce enery and water flux figure, and  I can 
> plot  baisc energy and water fulx figs using R. Now I am adding
> US map  (mainly boundary for US and boundary of 48 states) to my basic 
> plot. Could you please tell me to how do it (
> plaese give me an example R source code if it possible)?  I am just a 
> new begginer for R. Thanks,

Where have you acquired your US map? What coordinate reference system are
your energy and water flux data in - it it the same as your US map? Once
that is known, it should be simple enough, I hope.

> 
> Youlong
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no