[Qgis-user] Problem with "non valid geometry"

[Kirk Schmidt]

Hi Boris:

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.

Kirk


On 5/9/2018 9:35 AM, boris diaz wrote:
> Hi there, I´m trying to cut a raster with a polygon mask in qgis 2.18
>
> 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.
> Anyone can help me finding the real error and how can i repair it?
> Thanks. Boris
>
> ------------------------------------------------------------------------------------------------------
> Boris G. DIAZ - Mg.Sci.Ing. Forestal
> Área Recursos Hídricos - INTA EEA Santa Cruz
> Unidad Académica Río Gallegos (UNPA)
> https://www.facebook.com/aguapatagonia/ 
> <http://santacruzhidro.blogspot.com.ar/>
> http://santacruzhidro.blogspot.com.ar/
> www.researchgate.net <http://www.researchgate.net>
> ------------------------------------------------------------------------------------------------------
>
>
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-- 
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: kirk at nortekresources.com
Web: www.nortekreources.com

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