[postgis-users] Simplifying a multipolygon layer, keeping polygon connection

Nicolas Ribot nicolas.ribot at gmail.com
Wed Apr 11 05:30:31 PDT 2012

> Ok, I see you're using 'topo1' as input for the simplification.
> Instead you may want to simplify the input directly:
> select ST_CreateTopoGeo('topo1', ST_Collect(
>          ST_SimplifyPreserveTopology(geom, 10000)
>       ))
> from expl_dep;

Yes, this was the reason: hoping the noded edges could be simplified
without loosing the connectivity (which is the case :) )

In one pass, I fall back to the classical "simplify with broken
topology" as shown on the picture.

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