Thanks Erin,

I understand what you mean, and effectively, {rworldmap} example works 
great by modifying the code (e.g. by changing the argument value in 
'nameDataColumn').

However, what I need is to choose a specific country (e.g. US), or  
region, plot in this country the location (long, lat) of many climate 
stations from my data set, and to generate in that specific country the 
spatial variability of the climate variable considered (e.g. generating 
contours by interpolating point values onto the grid nodes: The nodes 
correspond to the climate-station locations and the point values 
correspond for example to the annual precipitation at each station).

Jose


On 3/30/2012 11:39 AM, Hodgess, Erin wrote:
> Did you look at the code for rworldmapExamples?
>
> I took that and modified the code and it worked great.
>
> thanks,
> Erin
>
>
> Erin M. Hodgess, PhD
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: hodgesse@uhd.edu
>
>
>
> -----Original Message-----
> From: r-sig-geo-bounces@r-project.org on behalf of Jose M Molina
> Sent: Fri 3/30/2012 10:37 AM
> To: r-sig-geo@r-project.org
> Subject: Re: [R-sig-Geo] a world type mapping question
>
> Hi R-Sig-Geo  friends,
>
> I have climatic data sets generated with R, and As Erin, I also need to
> plot spatial attributes (e.g. monthly rainfall), but at a country-level.
> In addition, I need also to plot spatial variability (e.g. isolines of
> mean annual precipitation) in the specified country.
> I am exploring now {rworldmap}, but it seems this is not possible.
> {PlotGoogleMaps} offers a very nice option, although I am struggling
> still with generating spatial interpolation for the isolines.
>
> I appreciate tour comments/suggestions.
>
> Jose
>
>
> On 3/29/2012 6:31 PM, Hodgess, Erin wrote:
>> Perfect...rworldmapExamples has everything.
>>
>> Thanks,
>> Erin
>>
>>
>> -----Original Message-----
>> From: Carson Farmer [mailto:carson.farmer@gmail.com]
>> Sent: Thursday, March 29, 2012 5:29 PM
>> To: Hodgess, Erin
>> Cc: r-sig-geo@r-project.org
>> Subject: Re: [R-sig-Geo] a world type mapping question
>>
>> Hi Erin (apologies for sending this to you twice, forgot to include list the first time),
>>
>> Have a look at rworldmap:
>> http://cran.r-project.org/web/packages/rworldmap/index.html
>>
>> Carson
>>
>> On Thu, Mar 29, 2012 at 11:19 PM, Hodgess, Erin<HodgessE@uhd.edu>   wrote:
>>> Dear People:
>>>
>>>
>>>
>>> I have a data set with rankings for 18 different countries on several
>>> different concepts.  I would like to produce a world map with colors
>>> on the ones with rankings and perhaps grays on the NA countries.
>>>
>>>
>>>
>>> Is there a data frame/set with a list of countries available, please?
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Erin
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Erin M. Hodgess, Ph.D.
>>>
>>> Associate Professor
>>>
>>> Department of Computer and Mathematical Sciences
>>>
>>> University of Houston - Downtown
>>>
>>> mailto: hodgesse@uhd.edu
>>>
>>>
>>>
>>>
>>>          [[alternative HTML version deleted]]
>>>
>>> _______________________________________________
>>> R-sig-Geo mailing list
>>> R-sig-Geo@r-project.org
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>> --
>> Dr. Carson J. Q. Farmer
>> Centre for GeoInformatics (CGI)
>> School of Geography and Geosciences
>> Irvine Building, University of St Andrews St Andrews, Fife, KY16 9AL Scotland, UK
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo@r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo

-- 
Jose M Molina
Department of Earth and Planetary Sciences
Johns Hopkins University
3400 N. Charles Street
Baltimore, MD 21218


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