[R-sig-Geo] Can voronoi polygons calculated in R be converted to ESRI shapefile?

[Roger Bivand]

On Tue, 13 Nov 2007, Debarchana Ghosh wrote:

> Hi,
>
> I have a point data frame with X and Y coordinates, where n=1051. I am
> trying to create Voronoi polygons using both the Tripack and PBSMapping
> packages.
>
> library(tripack)
> testbird.vm<-voronoi.mosaic(testbird$X, testbird$Y)
> testbird.vp<-voronoi.polygons(testbird.vm)
> plot(testbird.vp)
>
> library(PBSMapping)
> testbirdvor<-calcVoronoi(testbird)
>
>> From here how can I create an ESRI shapefile of the voronoi polygons in R
> and export to ArcGIS for further use.
>

There is a thread at:

http://article.gmane.org/gmane.comp.lang.r.geo/1275

which shows how to make a SpatialPolygonsDataFrame from deldir output 
(deldir closes the infinite polygons and clips large closed ones, but 
tripack does not). Could you please post with a short recipe once you 
resolve this, it is do-able, but the original thread touches on other 
things too, that are not relevant here.

Roger

> Thanks for the help,
> Debs.
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, 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