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
