Hi all,
the several methods available in QGIS for checking and cleaning up
invalid geometries always proved confusing to users. Now things are
getting even more complicated with the new FixGeometry function in GEOS.
The results of it are different from those of MakeValid.Some examples of
common cases here:
https://github.com/libgeos/geos/pull/433#issuecomment-821597724
An interesting thread here:
https://lists.osgeo.org/pipermail/postgis-devel/2021-April/028870.html
Any hope to take advantage of this to clarify the QGIS situation?
Cheers.
-- 
Paolo Cavallini
www.faunalia.eu - QGIS.org
training, support, development on QGIS, PostGIS and more
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