[R-sig-Geo] adjacent polygons

[hi_ono2001 at ybb.ne.jp]

Hello.

 You can also create this by using OpenJump(http://openjump.org)'s "planar graph" with some steps, and save results as DBase file although OJ, running on Java runtime,  is difficult in liking with R dynamically.


 Regards.

--- On Tue, 2011/10/11, Roger Bivand <Roger.Bivand at nhh.no> wrote:

> 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
>