Getting area of part of MultiPolygon in QGIS

Question

Is it possible, with QGIS, to get the area of a single part of a multi polygon? Or do I have to split them into single polygons?

Answer 1

Using Field Calc and Expressions:

expression used:

array_foreach(
      generate_series(1, num_geometries($geometry)),
          round(area(geometry_n( $geometry,@element)),0))

Answer 2

Using a script, you can get easily the areas.

• You need to check if it is multipart.
• parts method of QgsGeometry returns an iterator for parts

layer = iface.activeLayer()

for feat in layer.getFeatures():
    geom = feat.geometry()
    if geom.isMultipart():
        areas = sorted([part.area() for part in geom.parts()])
        print(feat.id(), areas)