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I wondered if I could add virtual fields to the feature tables of a number of polygon layers in a QGIS 3 project (or a geopackage).
As an example, I would like to add the virtual field area (km²) as round($area/1000000, 2) to ten polygon layers stored in a geopackage.
Is there a QGIS way of doing it? If not, any leads if I do this from R? (I don't use Python.)
Open the attribute table of your polygon layer, select field calculator and check the box "create virtual layer". Than just paste the expression to calculate the area. Define a name for your new field and select the field type.
