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I have a polygon layer in QGIS (building outlines) and I made a grid over this layer using the MMQGIS function. I want to calculate the area of the building outlines in each grid cell (so it becomes another column in the grid cell layer).

Any ideas?

It's all in vector.

1 Answer 1

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Use this expression on the grid layer and replace building_layer_name with the name of your layer containing the polygons of the buildings:

    area ( 
        intersection (
            $geometry, 
            collect_geometries (overlay_intersects ('building_layer_name',$geometry))
        )
    )

The expression used on the grid layer to create a label, indicating the area each cell overlaps with the building (2x2 m grid):

enter image description here

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