[Qgis-user] [Modeller] How to calculate area in the graphical modeler of QGIS

[Igor Oliveira Ribeiro]

Hi community,
I need your help. I'm using QGIS 3.10.11 with Grass 7.8.4. I'm building a
QGIS modeler and I want to calculate the area of an input polygon.

So, my input polygon is a vector feature. I tried using a field calculator
($area) and Advanced Python Field Calculator (Field "Formula", I used
"value = $geom.area() ).

However, nothing is working. When I run the modeler, there is no error
message. But, I'dont have the area calculated either.

Thanks for your help.

-- 

See our last paper:  <https://doi.org/10.1016/j.envpol.2020.114029>

Impact of biomass burning on a metropolitan area in the Amazon during the
2015 El Niño: The enhancement of carbon monoxide and levoglucosan
concentrations. <https://doi.org/10.1016/j.envpol.2020.114029>

Igor Oliveira Ribeiro

Post-Doc on Regional Climate Change, Vulnerability, Impacts and Adaptation
- Cuomo Foundation/UEA

+55 92 98103 7136 | skype: igorflorestal

Universidade do Estado do Amazonas | Instituto Nacional de Pesquisas da
Amazônia

Visite: www.geoescrita.com.br

<https://www.linkedin.com/in/igoroliveiraribeiro/>
<https://www.instagram.com/geoescrita/>
<https://www.researchgate.net/profile/Igor_Oliveira_Ribeiro>
<http://lattes.cnpq.br/3909691804095045>
<https://orcid.org/0000-0002-3529-0525> <https://www.geoescrita.com.br/>

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