[Qgis-developer] Valid or invalid geom in PostGIS?

[Paolo Cavallini]

Il 17/01/2017 11:38, Tom Chadwin ha scritto:
>> you can disable in QGIS the server-side simplification of that layer to
> only enable the local simplification
> 
> The huge benefit of the feature implementing server-side simplification is
> the reduction in data downloaded. Yes, we can do as you say, but we'll lose
> that benefit.
> 
> It will be interesting to see if the tolerance can be changed to get rid of
> the errors. If so, is there a logical pattern to the required tolerance
> which QGIS can then implement to retain server-side simplification but
> remove the errors?

there is also
http://postgis.net/docs/ST_SimplifyPreserveTopology.html
but it's much slower (understandably so)
more info here
https://carto.com/blog/smaller-faster
all the best
-- 
Paolo Cavallini - www.faunalia.eu
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