[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

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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
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