[R] mapping data to a geographic map of Europe

paladini at trustindata.de paladini at trustindata.de
Fri Nov 1 18:05:43 CET 2013

Hi Jim,
that works nice.
Thanks again!

Have a nice weekend, best regards


Zitat von Jim Lemon <jim at bitwrit.com.au>:

> On 10/31/2013 03:04 AM, paladini at trustindata.de wrote:
>> Hi Jim,
>> thats the second time that you helped me in a short while so thanks a lot!
>> But it seems to me quite laborious and error-prone to first select all
>> the relevant countries in this long list and then to create a color vector.
>> But perhaps I get it all wrong.
>> For the color vector I first did this
>> imagecolors<-color.scale(mydata$GPIndex ,c(1,0,0),0,c(0,0,1))
>> because I wanted the colors to scale from dark red (bad ones) to dark
>> blue (good ones).
>> But it went somehow wrong. By the way can you tell me what I did wrong?
>> Nevertheless I than createt a color vector looking loke this:
>> eurocol=c("#FF0000FF",8,"#710000FF","#390000FF",8,8,"#390000FF",rep(8,10),"#2F0000FF"
>> ,8,"#000000FF",8,"#000000FF","#000000FF" ,"#000055FF",8,"#000064FF",2,
>> "#000083FF",8,8,"#00008BFF" ,"#0000F0FF" ,rep(8,20),"#0000F7FF"
>> ,rep(8,18),"#0000FFFF", rep(8,120))
>> And than
>> world.map<-map('world', fill = TRUE,col =eurocol
>> ,xlim=c(-12,35),ylim=c(37,70))
>> Beside the wrong colors it worked okay.
>> But I am not really happy with this solution.
>> Did I misapprehend you?
> Hi Claudi,
> Maybe. You write that the transformation of GPIndex to colors "went  
> wrong". Let's see:
> # make up GPIndex
> GPIndex<-c(sample(1:100,33),rep(NA,165))
> # transform to colors
> eurocol<-color.scale(GPIndex,c(1,0),0,c(0,1))
> world.map<-map('world',fill=TRUE,
>  col=eurocol,xlim=c(-12,35),ylim=c(37,70))
> This gives me what I would expect, and checking the colors against  
> the country names (world.map$names) looks like the correct colors  
> have been displayed. Obviously I left a lot of areas out (missed UK  
> and Ireland for example) as I didn't want to overplot individual  
> countries with areas. Does this look okay to you?
> Jim

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