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

[Philip Barlow]

Hi Boris,

You could try the old buffer by zero trick if its self-intersections you are 
having a problem with.

Phil
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Kirk 
Schmidt
Sent: 09 May 2018 13:45
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Problem with "non valid geometry"


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: k...@nortekresources.com<mailto:k...@nortekresources.com>

Web: www.nortekreources.com<http://www.nortekreources.com>


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Re: [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/
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: k...@nortekresources.com
Web: www.nortekreources.com

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

[boris diaz]

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/
www.researchgate.net
--
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