[Qgis-user] model builder - merge several inputs

[Nicolas Cadieux]

Hi,

You could try a "join attribute by location" followed by a "Aggregate"...

Nicolas

On 2022-01-26 3:43 a.m., Simon Dietmann wrote:
>
> Dear list,
>
> I am trying to find a solution for the following problem with the 
> model builder:
>
> My model asks for two vector polygon layers that will be combined by 
> ‘union’. The resulting layer gets a new field (field calculator) and 
> is evaluated by ‘Statistics by categories’ algorithm. The fields for 
> the categories are selected by the user when calling the model. Since 
> those fields are present in the two separate input layers, I have to 
> use two separate ‘Vector field’ inputs.
>
> The problem arises when I try to combine those two input variables to 
> use them together for the ‘Statistics by categories’ algorithm. AFAICS 
> there is no function inside the model builder to achieve this, so I 
> suggest I have to export the model as  a python script. There I found 
> that the call of the Statistics function gives the name of the 
> variable as a parameter and not the variable itself:
>
> alg_params = {
>
> 'CATEGORIES_FIELD_NAME': parameters['fields'], ….
>
> How can I combine my two lists (~like “parameters[‘fields’+’fields2’], 
> or is there a way to do this inside the model builder that I didn´t find?
>
> Thanks in advance for help, kind regards
>
> Simon Dietmann
>
>
>
> Mit freundlichen Grüßen
> im Auftrag
>
>
> Simon Dietmann
> M.Sc. Physische Geografie
>
> Aufgrund der aktuellen Situation bin ich zur Zeit vermehrt im Home 
> Office tätig und dort erreichbar unter +49 69 – 57 80 56 98 oder per 
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>
>
>
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-- 
Nicolas Cadieux
https://gitlab.com/njacadieux
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