Re: Any functions for validating topology of areas, lines/points and/or routes?
2010-02-01 03:23:02 GMT
Stefan; This would be a nice "wish list" to make persistent somewhere, maybe on the wiki? On Sun, 2010-01-31 at 14:41 +0100, Stefan Keller wrote: > Dear all > > I’m preparing an introductory course about GIS and want to collect > topology functions. We’re evaluating QGIS and PostGIS and have to > be prepared that the functionality will be compared to ArcGIS/ > ArcEditor Geodatabase Topology (called topology rules there). > > Thus my question: Can anyone point me to topology functions, > most probably implements as stored procedures (pl/pgsql) and > triggers (rules)? > > I’ve compiled following “topology types” so far: > * Area topology cleaning: Eliminating sliver polygons, overshoots, > undershoots (polygon topology, same polygon class). > * Polygons are non-overlapping (polygon topology, same polygon class). > * Polygons are inside other polygons (polygon topology, two different > polygon classes). > * Line topology cleaning: Snapping close endpoints > (vertex-vertex/route topology). > * Routes that share vertices (vertex-vertex/route topology, same > line class). > * Line objects that share (inner) endpoints (node-vertex topology, > same line class). > * Line objects that are “connected to” point objects at their(Continue reading)