Hi Werner, give QuickPolygonRepair extension from Mike Elstermann (#geoobserver) a try.
Freundliche Grüße Thomas Struller Diplom Geologe BDG, V18 akademischer Geoinformatiker Sachverständiger nach BBodSchG §18 SG1 historische Recherche SG2 Pfad Boden-Grundwasser Privater Sachverständiger der Wasserwirtschaft Sachverständiger FÜ GBT T +49 911 12076 111 M +49 170 3320494 [email protected]<mailto:[email protected]> [cid:[email protected]] LGA Institut für Umweltgeologie und Altlasten GmbH Christian-Hessel-Straße 1 | 90427 Nürnberg Geschäftsführung: Carlo Schillinger | Dr. Jürgen Kisskalt Gesellschaftssitz: Nürnberg | Registergericht Nürnberg HRB 18895 [email protected]<mailto:[email protected]> | lga-geo.de<https://www.lga-geo.de/> | Datenschutz<https://www.lga-geo.de/datenschutz/> ------ Originalnachricht ------ Von "[email protected]" <[email protected]<mailto:[email protected]>> An "[email protected]" <[email protected]<mailto:[email protected]>> Datum 04.07.2025 08:18:50 Betreff QGIS-User Digest, Vol 233, Issue 2 Send QGIS-User mailing list submissions to [email protected]<mailto:[email protected]> To subscribe or unsubscribe via the World Wide Web, visit https://lists.osgeo.org/mailman/listinfo/qgis-user or, via email, send a message with subject or body 'help' to [email protected]<mailto:[email protected]> You can reach the person managing the list at [email protected]<mailto:[email protected]> When replying, please edit your Subject line so it is more specific than "Re: Contents of QGIS-User digest..." Today's Topics: 1. Re: Self Intersections: Issues with Polygon Features (Stijven, Jeroen) ---------------------------------------------------------------------- Message: 1 Date: Fri, 4 Jul 2025 06:18:43 +0000 From: "Stijven, Jeroen" <[email protected]<mailto:[email protected]>> To: "Isenmann, Werner (RPF)" <[email protected]<mailto:[email protected]>>, Nigel Berjak - General <[email protected]<mailto:[email protected]>> Cc: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [Qgis-user] Self Intersections: Issues with Polygon Features Message-ID: <pa6pr08mb10648896dea7a8d1d4a7b955d9e...@pa6pr08mb10648.eurprd08.prod.outlook.com<mailto:pa6pr08mb10648896dea7a8d1d4a7b955d9e...@pa6pr08mb10648.eurprd08.prod.outlook.com>> Content-Type: text/plain; charset="windows-1252" Dear Werner, Thanks a lot for the helpfull information, but can you send me a screenshot as example please? Thanks a lot. Met vriendelijke groeten, Jeroen Stijven E: [email protected]<mailto:[email protected]> Designer Besix Connect nv | Baaikensstraat 21/1, 9240 Zele +32 493 02 46 91 W: www.besixconnect.be<http://www.besixconnect.be> Volg ons op LinkedIn<https://www.linkedin.com/company/besix-connect/> of Facebook<https://www.facebook.com/profile.php?id=100054363827571> [cid:5b7453f0-89e2-4ec8-9a58-7e0fbc4ff990] ________________________________ From: QGIS-User <[email protected]<mailto:[email protected]>> on behalf of Nigel Berjak - General via QGIS-User <[email protected]<mailto:[email protected]>> Sent: Thursday, July 3, 2025 5:20 PM To: Isenmann, Werner (RPF) <[email protected]<mailto:[email protected]>> Cc: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: Re: [Qgis-user] Self Intersections: Issues with Polygon Features You don't often get email from [email protected]<mailto:[email protected]>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> Hi Werner An old trick is to buffer using 0 units, which usually resolves self-intersections. Cheers. --- Regards, Nigel Berjak Please consider the environment before printing this email. On 2025-07-03 16:11, Isenmann, Werner (RPF) via QGIS-User wrote: Hi, some colleagues have problems with shapefiles (really...) that contain polygons with self-intersections. The Vector Overlay - Clip tool, for example, cannot be executed because the algorithm does not run due to the self-intersection. Before executing the tool, the parameter ?Invalid feature filtering? can be set to ?Skip (Ignore) Features with Invalid Geometies?. The faulty polygons are then skipped, which is not desirable, however. QGIS offers various options for repairing self-intersections, for example: 1) Vector - Check Geometries plugin: however, this sometimes has very long runtimes which might not be acceptable. 2) Vector Geometry - Check Validity a - Method QGIS: takes a very long time, or does not run through b - Method GEOS: works correctly and quickly. However, only the first error is ever found. This is not convenient for files with many errors. Does anyone know a good solution for repairing (many) self-intersections with high performance in QGIS? Many thanks in advance, Werner --- Werner Isenmann Regierungspr?sidium Freiburg Referat 91 ? Geowissenschaftliches Landesservicezentrum Albertstra?e 5 D-79104 Freiburg i. Br. 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