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