[R-sig-Geo] adjacent polygons

[Roger Bivand]

On Mon, 10 Oct 2011, Facundo Muñoz wrote:

>
> Hi people,
>
> I have a shapefile of polygons (buildings), and I would like to calculate, 
> for each one, the length of the shared border with some other building.
> Or, conversely, how much of its border is 'exterior'.
> I can't figure out how to extract that info.

Without a topological GIS you cannot. Try vect2neigh() in spgrass6 using 
GRASS to do this. It can, I believe, also be done using vector coverages 
in ArcGIS.

Hope this helps,

Roger

>
> Any idea?
>
> Thanks.
> ƒacu.-
>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no