[R] political maps world maps in R, wrld_simpl

[Patrizio Frederic]

Roger,
many thanks for your very useful suggestions.
I've just produced some plot using xlim/ylim. I noticed I can only
zoom in a square box. Is there any way to produce rectangular ones?

Best

Patrizio

2009/4/7 Roger Bivand <Roger.Bivand at nhh.no>:
> Patrizio Frederic <frederic.patrizio <at> gmail.com> writes:
>
>>
>> dear all,
>> I'm a newbie in map tools. I was asking to perform an apparently very
>> simple task.
>> I have a list of countries (about fifty all over in the world) scored
>> with a real positive value. Eg
>> ...
>>
>> I wish to plot geographical maps where every country is filled with a
>> color depending on his score.
>> Using maptools library and wrld_simpl I can easily perform the world
>> map.
>
> Note that the file is included in recent releases of maptools, so just say
>
> data(wrld_simpl)
>
>> library(maptools)
>> load(url("http://spatial.nhh.no/R/etc/TM_WORLD_BORDERS_SIMPL-0.2.RData"))
>
> For matching the countries you have with the countries in the object (note
> that names may differ), I suggest simply adding ISO3 codes to your data
> frame, and using them as row names as well. Look at the spCbind methods in
> maptools.
>
>> Now what if I wish to zoom on some sub world regions such as Eastern
>> Europe or America or any other user defined contiguous sub group?
>
> Either select using [ or plot using xlim/ylim arguments
>
>>
>> Russia is a large country I could be interested in cutting it in two
>> peaces eastern and western. Can I do it using wrld_simpl or should I
>> search for other data? If so where can I find free maps data?
>
> You can plot part of Russia with the object as it is by using xlim/ylim
> arguments. You can manipulate low-level objects if you need to, but
> it is not easy unless you know what you are doing.
>
>>
>> Some documentation exists but it seems sparse to me.
>
> The R-sig-geo list is more focussed on this kind of question, as is pointed
> out on the Spatial Task View on CRAN.
>
> Hope this helps,
>
> Roger Bivand
>
>> Any hints will be appreciated.
>> Thanks in advance,
>>
>> Patrizio
>
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