[R-sig-Geo] igraph and spatial

[Mathieu Rajerison]

Hi,

Recently, I used igraph with spatial objects.

Once you have the coordinates of the nodes composing an edge, you can
transform it into a spatiallines object with this function :

makeLineFromCoords <- function(coords, i) {
  Sl1 = Line(coords)
  S1 = Lines(list(Sl1), ID=as.character(i))
  Sl = SpatialLines(list(S1))
  return(Sl)
}

For all the routing stuff within R, this resource by B. Rowlingson is quite
inspiring :
http://rstudio-pubs-static.s3.amazonaws.com/1572_7599552b60454033a0d5c5e6d2e34ffb.html

best,

Mathieu

2016-02-22 9:30 GMT+01:00 Michael Sumner <mdsumner at gmail.com>:

> On Mon, 22 Feb 2016 at 19:13 Luca Candeloro <luca.candeloro at gmail.com>
> wrote:
>
> > Dear all,
> > plotting graphs with given vertex coordinates is possible inside igraph
> > plot function.
> > I would like to transform vilsualized edges into SpatialLinesDataFrame,
> so
> > that they could be exported in .shp file...
> > Any suggestion?
> >
>
> Can you please provide a working igraph example that we can start with?
>
> Do you want coordinates as seen in a particular plot, or can it be more
> arbitrary?
>
> Cheers, Mike.
>
>
>
> > thanks in advance,
> > Luca
> >
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> >
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> --
> Dr. Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> 203 Channel Highway
> Kingston Tasmania 7050 Australia
>
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