I'm trying to use "expression based" labeling in QGIS, but I'm stuck with a particular case.
I managed to use it for a project with the help of other topics and FAQ but I'm not skilled enough to take care of this problem alone.
I have 5 layers, one "project" layer with around 10 objects (10 different marinas around rivers in France) and 4 layers for particular water area (different scales) with also polygons. I want to only show labels of those 4 last layers of the polygons that intersect any of my 10 objects of layer 1.
What query do I need to use?
Note: I already used the vector selection option and created a new layer with the selection. I'm looking for another option, label based because this is too long. I know there is also a "show/hide" option, but it is not very simple to use in my opinion.