[R-sig-Geo] Problem reading in polygon shapefile with readShapePoly

[Roger Bivand]

On Mon, 22 Jun 2009, Steven J. Pierce wrote:

> Roger,
>
> That worked. I successfully read in the file and plotted the resulting
> parcels object. Onward with my dissertation work! Thanks for responding so
> rapidly and for generously sharing your time and expertise.

Steven,

Your report was very thorough, making the data available helped too. The 
revised version of maptools will be submitted to CRAN this evening.

Best wishes,

Roger

>
>
> Steven J. Pierce
> Center for Statistical Training & Consulting (CSTAT)
> Michigan State University
> Web: http://www.cstat.msu.edu
>
>
> -----Original Message-----
> From: Roger Bivand [mailto:Roger.Bivand at nhh.no]
> Sent: Monday, June 22, 2009 1:29 PM
> To: Steven J. Pierce
> Subject: RE: [R-sig-Geo] Problem reading in polygon shapefile with
> readShapePoly
>
> On Mon, 22 Jun 2009, Steven J. Pierce wrote:
>
>> Roger,
>>
>> I posted a zip file containing that set of shapefiles at
>> [link removed]. Thank you
>> so much for taking a look at this.
>
> Steven,
>
> Please try this draft package:
>
> http://spatial.nhh.no/R/Devel/maptools_0.7-25.zip
>
> It worked for me on your example file. The tests inside readShapePoly were
> for ring closure using all.equal(), which permits a very small amount of
> machine fuzz, but in the Polygon class are identical(); this in addition to
> changes made after the reports about June 10. I've imposed identical() in
> both places, so the forcing policy now also forces ring closure on rings
> that were closed within machine precision, but not bit-identical first and
> last coordinates.
>
> Please let me know if this resolves your problem, if so, I'll release.
>
> Best wishes,
>
> Roger
>
> --
> 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
>
>
>

-- 
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