[R-sig-Geo] bubble maps for Italian cities

[Edzer Pebesma]

Annamaria,

library(sp)
xy =
SpatialPointsDataFrame(SpatialPoints(expand.grid(x=1:10,y=1:10)),data.frame(z=1:100))
plot(xy, cex = xy$z/mean(xy$z), col = grey(.8*xy$z/max(xy$z)), pch=16)

#or

spplot(xy, cex = xy$z/mean(xy$z), col.regions = grey(.8*xy$z/max(xy$z)))

both plot bubbles (filled circles) with different size and different colour.

On 03/23/2012 12:02 PM, gottiannamaria at virgilio.it wrote:
> Dear List,
> 
> I should prepare a series of thematic maps of Italy with some cities highlighted with bubble of different colors (to indicate different types) and others with bubble of different sizes (to indicate different amounts). I searched around a solution but to no avail. I would be very grateful if someone could give me some pointers on steps to be done. Thank you very much,
> 
> Annamaria
>   
> 	[[alternative HTML version deleted]]
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de