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<p>Hi Boris:<br>
</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.</p>
<p>Kirk <br>
</p>
<br>
<div class="moz-cite-prefix">On 5/9/2018 9:35 AM, boris diaz wrote:<br>
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<div>Hi there, I´m trying to cut a raster with a polygon mask
in qgis 2.18<br>
<br>
</div>
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.<br>
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Anyone can help me finding the real error and how can i repair
it?<br>
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<div>Thanks. Boris<br>
<br>
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<div dir="ltr">------------------------------------------------------------------------------------------------------<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"
moz-do-not-send="true">https://www.facebook.com/aguapatagonia/</a><br>
<a
href="http://santacruzhidro.blogspot.com.ar/"
target="_blank"
moz-do-not-send="true">http://santacruzhidro.blogspot.com.ar/</a><br>
<a href="http://www.researchgate.net"
target="_blank"
moz-do-not-send="true">www.researchgate.net</a><br>
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<div>------------------------------------------------------------------------------------------------------</div>
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com">kirk@nortekresources.com</a>
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