[Qgis-user] Dissolve tool failing to produce outputs

[Andrew Harfoot]

Just to add that the equivalent dissolve tool in 2.18.25 completes 
successfully on the data.

On 19/11/2018 14:47, Andrew Harfoot wrote:
>
> I'm seeing very strange behaviour with a particular shapefile in QGIS 
> 3.4.1. The data can be obtained here:
>
> https://drive.google.com/file/d/1BPVnsUbJREYh6TvLM07GAzXMiMneHemN/view?usp=sharing
>
> When I run the /Vector Geometry > Dissolve/ Processing tool on it, no 
> errors are raised, an output layer is created containing one row with 
> no geometry. This happens regardless of the Processing 'Invalid 
> features filtering' setting.
>
> Running the /GDAL > Vector geoprocessing > Dissolve/ tool on the data 
> immediately returns an invalid geometry (self intersection) error, but 
> running /Vector Geometry > Check validity/ finds no errors using 
> either the GEOS or QGIS engine.
>
> If the /Vector Geometry > Dissolve/ tool is run on a selection from 
> the shapefile, it will complete successfully if all but one feature is 
> selected, *regardless of which feature is left unselected*.
>
> I'm not sure whether this is a bug, or my data. Does anyone have any 
> explanation for the observed behaviour?
>
> Cheers,
>
> Andy
>
> -- 
> Andy Harfoot
>
> GeoData Institute
> University of Southampton
> Southampton
> SO17 1BJ
>
> Tel:  +44 (0)23 8059 2719
>
> www.geodata.soton.ac.uk


-- 
Andy Harfoot

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

Tel:  +44 (0)23 8059 2719

www.geodata.soton.ac.uk

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