[Qgis-user] Qgis Expression Batch Raster Calculator : How to derive layer name from input layer?

[celati Laurent]

Dear all,

I work with Qgis 3.4. Following to my previous message
<https://lists.osgeo.org/pipermail/qgis-user/2026-January/056029.html>
probably unclear. I'm taking the liberty to post a new message. With Qgis
raster batch mode, for the 'expression' column, i would like to derive
automatically the name of the input layer selected setted throw the input
layer column :

[image: image.png]

But i try to do that, the result is always NULL when i open the 'calcul by
expression' window :


[image: image.png]

I obtain always NULL. Whatever i fill for the arguments for the layer
argument : @input, @element

The problem could comes from the syntax of the expression ?

Thanks so much.
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