Thank you Sandro for this showcase. I just answer because I do not receive through gmail the answers of the thread I initiated. Only answers sent by others, like you Jose. Strange.
Nicolas On 13 April 2012 15:28, Jose Carlos Martinez <jomar...@cgf.upv.es> wrote: > nice example, > these kind of examples show the power of the persistent topology. > thanks to make it. > > > On 13/04/2012 14:42, Sandro Santilli wrote: >> >> On Wed, Apr 11, 2012 at 02:59:41PM +0200, Sandro Santilli wrote: >> >>> Alternatively you could still construct the topology with full-precision >>> edges and then simplify the edges in-place (possibly after a >>> CopyTopology), >>> using ST_ChangeEdgeGeom. That way the _original_ nodes will remain the >>> same >>> and you'd be only simplifying the edges connecting them. Beware in this >>> case that simplification might still introduce topology errors but such >>> errors would be cought by ST_ChangeEdgeGeom with throwing an exception. >>> >>> You may catch the exception to reduce tolerance for a given edge or >>> bypass >>> all checks by editing the edge_data table directly and cross your fingers >>> :) >>> ValidateTopology should then tell you what you broke, if you want to fix >>> manually after the fact. >> >> FYI, I wrote a blog post showcasing this approach (with code): >> >> >> http://strk.keybit.net/blog/2012/04/13/simplifying-a-map-layer-using-postgis-topology/ >> >> --strk; >> >> ,------o-. >> | __/ | Delivering high quality PostGIS 2.0 ! >> | / 2.0 | http://strk.keybit.net - http://vizzuality.com >> `-o------' >> >> _______________________________________________ >> postgis-users mailing list >> postgis-users@postgis.refractions.net >> http://postgis.refractions.net/mailman/listinfo/postgis-users > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users