[R] GADM -- Download World Map for R

[Lorenzo Isella]

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.isella at 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)
>>
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