[QGIS-Developer] timzonefinder vs point in polygon

[Nyall Dawson]

On Sat, 6 Feb 2021 at 07:54, Andrea Giudiceandrea <andreaerdna at libero.it> wrote:
>
> C Hamilton wrote
> > Using the algorithm Vector->Geoprocessing Tools->Intersection: 4 minutes,
> > 4
> > seconds
>
> Hi Calvin,
> maybe it could be better to use the "Join attributes by location" algorithm.
> It only takes few seconds to preform the join.

Confirmed - for me it only takes ~2 seconds, and that's on an
non-optimised debug build! There may be a few % more performance boost
on the proper QGIS release builds.

"Join attributes by location" has a bunch of extra logic to optimise
the method that the join is performed, which really pays off in this
particular situation (matching points to polygons, where number of
points >> number of polygons).

Nyall



>
> Regards.
>
> Andrea
>
>
>
> --
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