Thanks, I had also seen that, but I was hoping to avoid dealing with
the shapefiles and to download the world map as a spatial polygon data
frame.
Cheers
Lorenzo
On Wed, Mar 15, 2017 at 09:21:54AM +1100, Jim Lemon wrote:
Hi Lorenzo,
See:
http://www.gadm.org/version2
Jim
On Wed, Mar 15, 2017 at 1:57 AM, Lorenzo Isella
<lorenzo.ise...@gmail.com> 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)
______________________________________________
R-help@r-project.org 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.
______________________________________________
R-help@r-project.org 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.
