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<div>Hi Werner,</div>
<div><br>
</div>
<div>give QuickPolygonRepair extension from Mike Elstermann (#geoobserver) a try.</div>
<div><br>
</div>
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<p class="western" style="line-height: 100%; margin-bottom: 0cm"><font face="Arial, sans-serif"><font size="2" style="font-size: 11pt"><font size="2" style="font-size: 10pt">Freundliche Grüße</font></font></font></p>
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<br>
<br>
</p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
<font color="#004c87"><b>Thomas Struller</b></font></p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
Diplom Geologe BDG, V18</p>
<p style="line-height: 100%; margin-bottom: 0cm"><font face="Calibri, sans-serif"><font size="2" style="font-size: 11pt"><font face="Arial, sans-serif"><font size="1" style="font-size: 7pt">akademischer Geoinformatiker<br>
Sachverständiger nach BBodSchG §18<br>
SG1 historische Recherche<br>
SG2 Pfad Boden-Grundwasser<br>
Privater Sachverständiger der Wasserwirtschaft<br>
Sachverständiger FÜ GBT</font></font></font></font></p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
<br>
<br>
</p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
T +49 911 12076 111</p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
M +49 170 3320494</p>
<p class="western" style="line-height: 100%; margin-bottom: 0cm"><font color="#0000ff"><a href="mailto:thomas.struller@lga-geo.de"><font color="#000000">thomas.struller@lga-geo.de</font></a></font></p>
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<p class="western" style="line-height: 100%; margin-bottom: 0cm"><img src="cid:em779dee28-0832-40f2-b9e3-8ac75818e014@4090589a.com" border="0" width="300" height="92"><br>
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<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
<font size="1" style="font-size: 7pt">LGA Institut für Umweltgeologie und Altlasten GmbH</font></p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
<font size="1" style="font-size: 7pt">Christian-Hessel-Straße 1 | 90427 Nürnberg</font></p>
<p class="western" style="line-height: 100%; margin-top: 0.07cm; margin-bottom: 0.07cm">
<font size="1" style="font-size: 7pt">Geschäftsführung: Carlo Schillinger | Dr. Jürgen Kisskalt</font></p>
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<font size="1" style="font-size: 7pt">Gesellschaftssitz: Nürnberg | Registergericht Nürnberg HRB 18895</font></p>
<p class="western" style="line-height: 100%; margin-bottom: 0cm"><font color="#0000ff"><a href="mailto:info@lga-geo.de"><font color="#004c87"><font size="1" style="font-size: 7pt">info@lga-geo.de</font></font></a></font><font size="1" style="font-size: 7pt">
|</font><font color="#004c87"><font size="1" style="font-size: 7pt"> </font></font><font color="#0000ff"><a href="https://www.lga-geo.de/"><font color="#004c87"><font size="1" style="font-size: 7pt">lga-geo.de</font></font></a></font><font size="1" style="font-size: 7pt">
| </font><font color="#0000ff"><a href="https://www.lga-geo.de/datenschutz/"><font color="#004c87"><font size="1" style="font-size: 7pt">Datenschutz</font></font></a></font></p>
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<div>
<div>------ Originalnachricht ------</div>
<div>Von "qgis-user-request@lists.osgeo.org" <<a href="mailto:qgis-user-request@lists.osgeo.org">qgis-user-request@lists.osgeo.org</a>></div>
<div>An "qgis-user@lists.osgeo.org" <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>></div>
<div>Datum 04.07.2025 08:18:50</div>
<div>Betreff QGIS-User Digest, Vol 233, Issue 2</div>
</div>
<div x-em-quote=""><br>
</div>
<div id="xdf13f15b5bb44c5" class="plain">
<blockquote cite="mailman.3837.1751609930.11180.qgis-user@lists.osgeo.org" type="cite" class="cite2">
<div class="plain_line">Send QGIS-User mailing list submissions to</div>
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<div class="plain_line">or, via email, send a message with subject or body 'help' to</div>
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<div class="plain_line">When replying, please edit your Subject line so it is more specific</div>
<div class="plain_line">than "Re: Contents of QGIS-User digest..."</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Today's Topics:</div>
<div class="plain_line"> </div>
<div class="plain_line">1. Re: Self Intersections: Issues with Polygon Features</div>
<div class="plain_line">(Stijven, Jeroen)</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">----------------------------------------------------------------------</div>
<div class="plain_line"> </div>
<div class="plain_line">Message: 1</div>
<div class="plain_line">Date: Fri, 4 Jul 2025 06:18:43 +0000</div>
<div class="plain_line">From: "Stijven, Jeroen" <<a href="mailto:Jeroen.Stijven@besix.com">Jeroen.Stijven@besix.com</a>></div>
<div class="plain_line">To: "Isenmann, Werner (RPF)" <<a href="mailto:Werner.Isenmann@rpf.bwl.de">Werner.Isenmann@rpf.bwl.de</a>>, Nigel</div>
<div class="plain_line">Berjak - General <<a href="mailto:nigel@s3.co.za">nigel@s3.co.za</a>></div>
<div class="plain_line">Cc: "<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>" <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>></div>
<div class="plain_line">Subject: Re: [Qgis-user] Self Intersections: Issues with Polygon</div>
<div class="plain_line">Features</div>
<div class="plain_line">Message-ID:</div>
<div class="plain_line"><<a href="mailto:PA6PR08MB10648896DEA7A8D1D4A7B955D9E42A@PA6PR08MB10648.eurprd08.prod.outlook.com">PA6PR08MB10648896DEA7A8D1D4A7B955D9E42A@PA6PR08MB10648.eurprd08.prod.outlook.com</a>></div>
<div class="plain_line"></div>
<div class="plain_line">Content-Type: text/plain; charset="windows-1252"</div>
<div class="plain_line"> </div>
<div class="plain_line">Dear Werner,</div>
<div class="plain_line"> </div>
<div class="plain_line">Thanks a lot for the helpfull information, but can you send me a screenshot as example please?</div>
<div class="plain_line">Thanks a lot.</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Met vriendelijke groeten,</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Jeroen Stijven E: <a href="mailto:jeroen.stijven@besix.com">
jeroen.stijven@besix.com</a></div>
<div class="plain_line"> </div>
<div class="plain_line">Designer Besix Connect nv | Baaikensstraat 21/1, 9240 Zele</div>
<div class="plain_line"> </div>
<div class="plain_line">+32 493 02 46 91 W: <a href="http://www.besixconnect.be">
www.besixconnect.be</a></div>
<div class="plain_line"> </div>
<div class="plain_line">Volg ons op LinkedIn<<a href="https://www.linkedin.com/company/besix-connect/">https://www.linkedin.com/company/besix-connect/</a>> of Facebook<<a href="https://www.facebook.com/profile.php?id=100054363827571">https://www.facebook.com/profile.php?id=100054363827571</a>></div>
<div class="plain_line"> </div>
<div class="plain_line">[cid:5b7453f0-89e2-4ec8-9a58-7e0fbc4ff990]</div>
<div class="plain_line">________________________________</div>
<div class="plain_line">From: QGIS-User <<a href="mailto:qgis-user-bounces@lists.osgeo.org">qgis-user-bounces@lists.osgeo.org</a>> on behalf of Nigel Berjak - General via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>></div>
<div class="plain_line">Sent: Thursday, July 3, 2025 5:20 PM</div>
<div class="plain_line">To: Isenmann, Werner (RPF) <<a href="mailto:Werner.Isenmann@rpf.bwl.de">Werner.Isenmann@rpf.bwl.de</a>></div>
<div class="plain_line">Cc: <a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a> <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>></div>
<div class="plain_line">Subject: Re: [Qgis-user] Self Intersections: Issues with Polygon Features</div>
<div class="plain_line"> </div>
<div class="plain_line">You don't often get email from <a href="mailto:qgis-user@lists.osgeo.org">
qgis-user@lists.osgeo.org</a>. Learn why this is important<<a href="https://aka.ms/LearnAboutSenderIdentification">https://aka.ms/LearnAboutSenderIdentification</a>></div>
<div class="plain_line"> </div>
<div class="plain_line">Hi Werner</div>
<div class="plain_line"> </div>
<div class="plain_line">An old trick is to buffer using 0 units, which usually resolves self-intersections.</div>
<div class="plain_line"> </div>
<div class="plain_line">Cheers.</div>
<div class="plain_line"> </div>
<div class="plain_line">---</div>
<div class="plain_line">Regards,</div>
<div class="plain_line"> </div>
<div class="plain_line">Nigel Berjak</div>
<div class="plain_line">Please consider the environment before printing this email.</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">On 2025-07-03 16:11, Isenmann, Werner (RPF) via QGIS-User wrote:</div>
<div class="plain_line"> </div>
<div class="plain_line">Hi,</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">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.</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">QGIS offers various options for repairing self-intersections, for example:</div>
<div class="plain_line"> </div>
<div class="plain_line">1) Vector - Check Geometries plugin: however, this sometimes has very long runtimes which might not be acceptable.</div>
<div class="plain_line"> </div>
<div class="plain_line">2) Vector Geometry - Check Validity</div>
<div class="plain_line"> </div>
<div class="plain_line">a - Method QGIS: takes a very long time, or does not run through</div>
<div class="plain_line"> </div>
<div class="plain_line">b - Method GEOS: works correctly and quickly. However, only the first error is ever found. This is not convenient for files with many errors.</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Does anyone know a good solution for repairing (many) self-intersections with high performance in QGIS?</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Many thanks in advance,</div>
<div class="plain_line"> </div>
<div class="plain_line">Werner</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">---</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
<div class="plain_line">Werner Isenmann</div>
<div class="plain_line"> </div>
<div class="plain_line"> </div>
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<div class="plain_line">Regierungspr?sidium Freiburg</div>
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