Learn QGIS - Fourth Edition

Populating attribute data

Finally, let's populate the Area field. Open the attribute table and click on the Field Calculator. We will update the Area field and use the $area from the Geometry section. In the following screenshot, we have searched for an area and doubled-clicked $area to move it to the Expression window:

Field calculator to calculate the area

When done, click on OK and look at the attribute table. It will not be exactly the same as mine, as you have manually digitized these areas. You should have values populated, and this will look similar to the following screenshot:

Attribute table with updated area values

We will discuss ...