Hi Lorenzo, See: http://www.gadm.org/version2
Jim On Wed, Mar 15, 2017 at 1:57 AM, Lorenzo Isella <[email protected]> wrote: > Dear All, > Please have a look at the snippet here > > http://bit.ly/2mVS8me > > This short code addresses precisely one of my needs: to superimpose a > network (created with the igraph library) to a geographical map. > Unlike the case of the example, where a single country is enough, I > need to have a world map in R to which superimpose the network. > Seen that I am far from an expert about plotting maps in R (you may > want to resort to a purely ggplot oriented solution for the map, but > then you need to translate your network into something ggplot > understands -- see http://bit.ly/2mVSOIk ). > For me it would be way simpler to follow the footsteps of the work > done in the previous link, but I cannot download from GADM a world > map. > Does anybody know how to achieve that? > Regards > > Lorenzo > > > #######################################################à > library(raster) > library(igraph) > greece <- getData('GADM', country='GRC', level=1) > df<-data.frame("from" = c("Athens", "Iraklio", "Thessaloniki", > "Patra"), "to"= c("Thessaloniki", "Thessaloniki", "Athens", > "Iraklio")) > meta <- data.frame("name"=c("Athens", "Iraklio", "Thessaloniki", > "Patra"), > "lon"=c(23.72800,25.13356,22.94090,21.73507), > "lat"=c(37.98415,35.33349,40.63229,38.24628)) > g <- graph.data.frame(df, directed=T, > vertices=meta) > lo <- as.matrix(meta[,2:3]) > plot(greece) > plot(g, layout=lo, add = TRUE, rescale = > FALSE) > > ______________________________________________ > [email protected] mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see 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.
