Isenmann, Werner (RPF) Werner.Isenmann at rpf.bwl.de
Thu Jul 3 07:11:07 PDT 2025
> Does anyone know a good solution for repairing (many)
self-intersections with high performance in QGIS?
Hi Werner,
which QGIS version exactly are you using and on which operative system?
Which GDAL and GEOS libraries is QGIS using?
QGIS has a processing algorithm specifically intended to fix invalid
geometry:
"Vector geometry - Fix geometries"
https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#fix-geometries
As suggested by Nigel, you could also use the trick of using the "Vector
geometry - Buffer" processing algorithm with the "Distance" parameter
set to the value 0.
If you are using QGIS 3.44, then you can also use the "Fix Geometry -
Split self-intersecting geometries" processing algorithm.
If you are experiencing some issue running the "Vector geometry - Check
validity" processing algorithm (which however is not intended to fix
invalid geometries) it would be useful if you reported such issue at
https://github.com/qgis/QGIS/issues
In order to search for self-intersecting geometries, you could also use
the "Check Geometry - Self-intersections" processing algorithm (QGIS >=
3.44).
Best regards.
Andrea Giudiceandrea
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