The hardest thing is (as Steve said) it seems more of a higher level application thing. PostGIS could leverage a datamodel to separate vertexes, boundaries, areas, etc and even map what is common for each geometry, but I think it would be really hard to enforce such dynamic events (editing mostly).
PostGIS could do error verification according to some rules too, but I feel that this really needs to be at app level. George On Thu, Jul 1, 2010 at 10:43 AM, Stephen Woodbridge <[email protected] > wrote: > strk wrote: > >> Hello post-GIS users! >> I was wondering how many of you guys (if any) ever >> tried or even currently makes use of the topology >> model provided with PostGIS in the topology/ directory. >> >> It's been there since 2005 (times of postgis-1.1.x, geos-2.1, >> postgresql-7.3). >> >> For the record: it has been broken for some time as PostGIS >> changed function signatures and PostgreSQL switched a couple >> of major versions, but works again in trunk. >> >> So, did anyone try it ? >> > > Yes, a few years back, but it did not seem to support the use cases I was > looking at. Use cases: > > 1. working with polygon coverages to maintain boundary coherence during > edits > 2. simplify adjacent polygons without leaving gaps between them. > 3. editing road networks and maintaining coherence of joined segments and > intersections > > While these are more high level application ideas and I guess at the lowest > level you could build a topology that would support any of these, where did > not seem to be support for any higher level functions that would help > support implementing these ideas. > > Its been too many cycle since I tried it and my memory is not that clear on > this any more, but that is what I remember. That said, I think it is very > cool and would like to see more movement on it, but never found any funding > possibilities because it seemed like it needed a lot to mature it as a > product. > > Thanks for the fixes to trunk. > > -Steve W > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- George R. C. Silva Desenvolvimento em GIS http://blog.geoprocessamento.net
_______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
