> A lot of us never understood, still don't, how ESRI could have ever * probably some people don't care about data quality ... * it is quicker to setup and maintain without topology * the topology model in old ArcInfo also could get corrupted and often required manual building/cleaning of the topology.
But I agree - there are also many disadvantages if correct topology is not enforced. > dropped topology in the first place. It's caused no end of headaches, > and still is. The new approach has a lot more potential, encompassing > a wider variety of rules and greater number of layers, but is harder > to utilize because you need to set it up ahead of time and it is > optional. With coverages you had no choice, topology is baked into the > file format. the new topology rules in ArcGIS go beyond to what was possible in old ArcInfo - but in my experience it is sometimes unstable. I often got crashes when I used the topology rules in earlier builds (tried about 2 years ago when I still had access to ESRI software) > I'm pleasantly surprised and encouraged to see topology has been > thought about and incorporated into qgis 1.0. :) yes - but to be fair - it is not nearly as complete and powerful as the topology rules in ArcGIS. What Marco implemented was more an editing help/support than a topology rule that enforces correct topology. But is great to have this support at all! Andreas -- Andreas Neumann Böschacherstrasse 6, CH-8624 Grüt/Gossau, Switzerland Email: [EMAIL PROTECTED], Web: * http://www.carto.net/ (Carto and SVG resources) * http://www.carto.net/neumann/ (personal page) * http://www.svgopen.org/ (SVG Open Conference) * http://www.geofoto.ch/ (Georeferenced Photos of Switzerland) _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
