[QGIS-Developer] point in polygon strikes again: big performance issue

[Jorge Gustavo Rocha]

Hi David,

Thanks for replication this issue. "Join attributes by location
(summary)" is definitely the best choice for this use case. It creates
the new layer in a few seconds. That's why I think we are missing
something (spatial indexes?, dependency graph?) in the expression engine.

There are anomalies in the data. That's almost the same with any dataset
we start working with :-)

Regards,

Jorge

Às 21:47 de 14/03/21, David Strip escreveu:
> I was able to replicate your problem on my system (Win 10, QGIS 3.10.5).
> 
> I tried "Join attributes by location (summary)". This computed the
> result in about 5 seconds.
> There are some anomalies in the data, however. For example, there's an
> entry for Belgium with province value "Unknown" and no lat/lon, so it
> doesn't get included in the total. Also, the point for Northern
> Territories, Australia, lies in the ocean, so it is not contained in the
> Australia polygon.
> 

J. Gustavo
-- 
Jorge Gustavo Rocha
Departamento de Informática
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