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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">QGIS offers various options for repairing self-intersections, for example:<o:p></o:p></span></p>
<p class="MsoNormal"><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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">2) Vector Geometry - Check Validity<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">a - Method QGIS: takes a very long time, or does not run through<o:p></o:p></span></p>
<p class="MsoNormal"><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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><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?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Many thanks in advance,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Werner<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE">---<o:p></o:p></span></b></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE">Werner Isenmann<o:p></o:p></span></b></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE">Regierungspräsidium Freiburg<o:p></o:p></span></p>
<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:DE">Referat 91 – Geowissenschaftliches Landesservicezentrum<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;mso-fareast-language:DE">Albertstraße 5<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;mso-fareast-language:DE">D-79104 Freiburg i. Br.<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;mso-fareast-language:DE">Phone: (+49) 761 208-3008<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%;text-autospace:ideograph-other"><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;mso-fareast-language:DE">E-Mail:
<a href="mailto:Werner.Isenmann@rpf.bwl.de"><span style="color:windowtext">Werner.Isenmann@rpf.bwl.de</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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