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 > > > _______________________________________________ > Gvsig_internacional mailing list > [email protected] > http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional > > >
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 _______________________________________________ Gvsig_internacional mailing list [email protected] http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
