[R] diffusing GIS data in maps

Vladimir Eremeev wl2776 at gmail.com
Tue Aug 14 12:02:37 CEST 2007

You will find some useful information in the 

Particularly, Fig. 07 in the Graph gallery.

Package spmaps can be used to extract desired boundaries from the mapdata
and convert them to the format suitable for sp and others.

Lawrence D. Brenninkmeyer wrote:
> Hi-
> I am trying to find a way to diffuse GIS data on a European map. I have a
> dataset consisting of particular locations scattered across Europe,
> along with magnitude and value information. I can plot these as discrete
> points with something like the following:
> "geocode" is a dataframe with four columns: LAT; LONG; MAGNITUDE;VALUE.
> library(maps)
> library(mapdata)
> map("worldHires", regions=c("Germany", "Belgium", "Netherlands"))
> points(geocode$LONG, geocode$LAT, cex=geocode$MAGNITUDE / 2500,
> col=rainbow(length(geocode$VALUE), start=0, end=.4)[rank(geocode$VALUE)])
> This gives me a map of Europe with my datapoints highlighted in two ways:
> magnitude is represented by the size of the point, and value is
> represented by the color.
> However, what I would really like is for there to be some sort of
> diffusion, such that instead of discrete points, the European map is
> covered in color so I can see more clearly whether there are regional
> patterns (something that will presumably look like this contour chart:
> <http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=20>  only
> on the European map).

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