Whats wrong with the difference tool QGIS 2.14.1?

Question

I want to get the difference between two poligons.

I compare the result from Arcgis erase tool and QGIS difference. ArcGIS give me that I want, but Qgis don't.

Why?

QGIS not only give wrong results,don't give me the holes that I want to fill.

Anyone knows why this don't works?. I don't have selected polygons in QGIS.

Can you provide test data? Are any of the input geometries invalid? This should probably be a bug report rather than a GIS.SE question. — underdark, Commented Apr 2, 2016 at 20:32
Hi. Thanks for your answer. I get the same result in ArcGIS and QGIS, but in QGIS I used the difference tool from SAGA vector polygon tools. — Manuel Alejandro, Commented Apr 2, 2016 at 20:51
Good to hear that you found a solution! Would still be great if you could file a ticket for the difference tool that didn't work. — underdark, Commented Apr 2, 2016 at 20:58
You can check validity using Vector | Geometry tools | Check validity — underdark, Commented Apr 2, 2016 at 21:31

Manuel Alejandro · Accepted Answer · 2016-04-02 20:54:23Z

3

I get the same result in ArcGIS and QGIS, but in QGIS I used the difference tool from SAGA vector polygon tools.

Here the result.

answered Apr 2, 2016 at 20:54

Manuel Alejandro

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I have had some issues with the QGIS difference tool for larger complex datasets. But SAGA has worked well.
– HeikkiVesanto ♦
Commented Apr 4, 2016 at 10:38

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