Hi. You will find some useful information in the http://r-spatial.sourceforge.net/
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). > > -- View this message in context: http://www.nabble.com/diffusing-GIS-data-in-maps-tf4265350.html#a12141809 Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.