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I have create a layer that is the represents the overlay areas based on some condition. The overlay is represented in purple:

enter image description here

I want to know the area of the overlay - which is a separate layer that has been created using the geoprocessing tool intersect. To calculate the area of the overlay I have done the following:

select the layer overlay in the layer panel -> right click on open attribute table -> activate toggle editing mode -> open field calculator -> write query as following:

enter image description here

The problem is that no calculations are made. In the attribute table there is only NULL for every cell entry.

Am i missing something? How can I calculate the area of overlay?

4

You just have to write $area instead of "field_name" = $area under Expression's panel

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