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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