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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Boris,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You could try the old buffer by zero trick if its self-intersections you are having a problem with.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Phil<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Kirk Schmidt<br>
<b>Sent:</b> 09 May 2018 13:45<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Problem with "non valid geometry"<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi Boris:<o:p></o:p></p>
<p>You can use the grass modules under processing toolbox>Grass GIS 7 commands>Vector>v.build.check or v.clean to isolate the problem. Typically it is a polygons with and intersecting sliver that creates the problem.<o:p></o:p></p>
<p>Kirk <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 5/9/2018 9:35 AM, boris diaz wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi there, I´m trying to cut a raster with a polygon mask in qgis 2.18<o:p></o:p></p>
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<p class="MsoNormal">The validation tool produces a draw with the message "valid output", but the topology tool finds a "non valid geometry" in the id objetc 0. The shape has only one object, an irregular polygon representing a watershed. SO the error shows
the entire watershed.<o:p></o:p></p>
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<p class="MsoNormal">Anyone can help me finding the real error and how can i repair it?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Thanks. Boris<o:p></o:p></p>
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<p class="MsoNormal">------------------------------------------------------------------------------------------------------<br>
Boris G. DIAZ - Mg.Sci.Ing. Forestal<br>
Área Recursos Hídricos - INTA EEA Santa Cruz<br>
Unidad Académica Río Gallegos (UNPA)<br>
<a href="http://santacruzhidro.blogspot.com.ar/" target="_blank">https://www.facebook.com/aguapatagonia/</a><br>
<a href="http://santacruzhidro.blogspot.com.ar/" target="_blank">http://santacruzhidro.blogspot.com.ar/</a><br>
<a href="http://www.researchgate.net" target="_blank">www.researchgate.net</a><o:p></o:p></p>
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<p class="MsoNormal">------------------------------------------------------------------------------------------------------<o:p></o:p></p>
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<p class="MsoNormal"><br>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Qgis-user mailing list<o:p></o:p></pre>
<pre><a href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a><o:p></o:p></pre>
<pre>List info: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-user">https://lists.osgeo.org/mailman/listinfo/qgis-user</a><o:p></o:p></pre>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Kirk Schmidt, MScF, BScF, RPF<o:p></o:p></pre>
<pre>General Manager<o:p></o:p></pre>
<pre>Nortek Resource Solutions Inc.<o:p></o:p></pre>
<pre>RR # 1<o:p></o:p></pre>
<pre>Thorburn, NS<o:p></o:p></pre>
<pre>B0K 1W0<o:p></o:p></pre>
<pre>Tel (902) 922.3607<o:p></o:p></pre>
<pre>Email: <a href="mailto:kirk@nortekresources.com">kirk@nortekresources.com</a><o:p></o:p></pre>
<pre>Web: <a href="http://www.nortekreources.com">www.nortekreources.com</a><o:p></o:p></pre>
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