> On Wed, 2008-10-22 at 14:22 -0400, Woolard, Zachary S. wrote: >> I just wanted to raise the point that you can set up topological >> editing >> in ESRI products. You can set up shared boundaries between polygons, >> along with several other topology rules. The only stipulation is that >> the data be in a geodatabase. > > Just curious: was it always in ArcGIS (not ArcInfo) like that?
No not always. Topology enforcement was no longer available in the transition from Arcinfo Workstation 7.x to ArcGIS 8 when the coverage storage model was (attempted to be) abandoned. Topology rules were re-introduced in 9.2 (may have been 9.1?) and continue to be further developed now in 9.3+. There are two places to apply topology: real topology which is enforced within the geodatabase and "map topology" which is on the fly and saved within individual map projects (.mxd's). The latter is simpler and limited, but occasionally useful when you don't want or have the time to sit down and model your data properly. A lot of us never understood, still don't, how ESRI could have ever 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. I'm pleasantly surprised and encouraged to see topology has been thought about and incorporated into qgis 1.0. :) -- -matt _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user