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Dear Werner,</div>
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Thanks a lot for the helpfull information, but can you send me a screenshot as example please?</div>
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Thanks a lot.</div>
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<p style="margin: 0cm;"><span style="font-family: Aptos, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Jeroen Stijven E: jeroen.stijven@besix.com</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> QGIS-User <qgis-user-bounces@lists.osgeo.org> on behalf of Nigel Berjak - General via QGIS-User <qgis-user@lists.osgeo.org><br>
<b>Sent:</b> Thursday, July 3, 2025 5:20 PM<br>
<b>To:</b> Isenmann, Werner (RPF) <Werner.Isenmann@rpf.bwl.de><br>
<b>Cc:</b> qgis-user@lists.osgeo.org <qgis-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [Qgis-user] Self Intersections: Issues with Polygon Features</font>
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<p>Hi Werner</p>
<p>An old trick is to buffer using 0 units, which usually resolves self-intersections.</p>
<p>Cheers.</p>
<div id="x_signature">---<br>
<div class="x_pre" style="margin:0; padding:0; font-family:monospace">Regards,<br>
<br>
Nigel Berjak<br>
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<p id="x_reply-intro">On 2025-07-03 16:11, Isenmann, Werner (RPF) via QGIS-User wrote:</p>
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<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Hi,</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">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.</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">QGIS offers various options for repairing self-intersections, for example:</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">1) Vector - Check Geometries plugin: however, this sometimes has very long runtimes which might not be acceptable.</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">2) Vector Geometry - Check Validity</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">a - Method QGIS: takes a very long time, or does not run through</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">b - Method GEOS: works correctly and quickly. However, only the first error is ever found. This is not convenient for files with many errors.</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Does anyone know a good solution for repairing (many) self-intersections with high performance in QGIS?</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Many thanks in advance,</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Werner</span></p>
<p class="x_v1MsoNormal"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><strong><span style="font-size:10.0pt; font-family:'Arial',sans-serif">---</span></strong></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><strong><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></strong></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><strong><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Werner Isenmann</span></strong></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt; font-family:'Arial',sans-serif"> </span></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Regierungspräsidium Freiburg</span></p>
<p class="x_v1MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt; font-family:'Arial',sans-serif">Referat 91 – Geowissenschaftliches Landesservicezentrum</span></p>
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<span style="font-size:10.0pt; line-height:105%; font-family:'Arial',sans-serif">Albertstraße 5</span></p>
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