Hi Jeff,

It turns out it is a memory issue. I'm running a loop with pyqgis and after
doing the union, it doesn't release the shm or wal gpkg files on the
original union inputs. Anyway of releasing these after running each union?

Thanks
Le gach dea ghui,
*Shane Carey*
*GIS and Data Solutions Consultant*


On Tue, Nov 26, 2019 at 2:33 PM Jeff McKenna <[email protected]>
wrote:

> Not sure.  My next step would be to upgrade to QGIS 3.10.0 and retry.
>
> -jeff
>
>
>
> On 2019-11-26 10:20 AM, Shane Carey wrote:
> > Thanks Jeff,
> >
> > Yep, I've tried running this and still makes no difference I'm afraid. I
> > thought it may have been a memory issue but its not that either.
> > So I'm lost as to what is causing it.
> > Cheers
> > Le gach dea ghui,
> > */Shane Carey/*
> > */GIS and Data Solutions Consultant/*
> >
> >
> > On Tue, Nov 26, 2019 at 2:19 PM Jeff McKenna
> > <[email protected] <mailto:[email protected]>>
> > wrote:
> >
> >     Hi Shane,
> >
> >     Likely it means that there is a problem with your
> geometry/topology.  I
> >     don't have your version locally, but look for a QGIS menu item of
> >     "Check
> >     Validity" or "Fix Geometries".
> >
> >     -jeff
> >
> >
> >
> >     --
> >     Jeff McKenna
> >     MapServer Consulting and Training Services
> >     https://gatewaygeomatics.com/
> >
> >
> >     On 2019-11-26 9:48 AM, Shane Carey wrote:
> >      > Hi,
> >      >
> >      > I'm running a union process in qgis 3.4 and I keep getting the
> >     following
> >      > error:
> >      > *geos geoprocessing error difference failed*
> >      > What does this error mean?
> >      > Thanks
> >      > Le gach dea ghui,
> >      > */Shane Carey/*
> >      > */GIS and Data Solutions Consultant/*
> >      >
> >     _______________________________________________
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>
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> https://gatewaygeomatics.com/
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