[Gvsig_english] Different results from buffering using SEXTANTE & Geoprocessing tools OADE

[Nuria Fora]

Dr. F. Patrick Graz wrote:
> Hi all,
> I'm using gvSIG to teach an introduction to GIS. During a practical
> exercise, however, I found that buffering in the geoprocessing tools and in
> SEXTANTE produce different results. Using line (a road data set) data to
> buffer -
>
> - the geoprocessing tools permit the merging of buffer zones into 1. If this
> option is not set, however, the resulting buffer file contains line
> features, not polygons. In this instance the attributes of the lines are
> attached to the output, but no buffer distance is specified.
> - With 'merging' enabled, the output is a polygon file, and shows the buffer
> distance.
> - buffering concentric zones without merging produced the line features
> indicated earlier
> - buffering concentric zones with merging of features caused the merging of
> all zones into one.
>
> - buffering in SEXTANTE does not provide the option of merging. However, the
> attributes of the output show both the attributes of the lines as well as
> the buffer distance.
> - when manually dissolving this output using SEXTANTE, however, the
> intersections of lines were surrounded by a 'roundabout'/traffic circle.
>
> :-) the students were able to complete their project, but there was a little
> consternation on the side.
>
> Has anyone observed similar issues?
>
> Patrick
>
> ------------------------------------------
> Dr. F. Patrick Graz
> Snr. Researcher, 
> Multidisciplinary Research Centre, 
> University of Namibia
>
>
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>
>
>   

Hi Patrick,

I tested it and I'm totally agree. Buffer attributes are copied from the 
lines table if option dissolve isn't checked. It'll be reported as a 
bug. Thank you for report it to the list.
Regards,

Núria