Combine Polygons¶

Use this dialog to calculate a new polygon by combining existing polygons.

Where can I find the dialog?¶

Right-click in the horizontal list field for polygons and select Tools - Combine Polygons...

You can choose from the following operations:

Union: Merges all selected polygons into a single shape that covers the entire area of the original polygons.
Intersection: Finds the overlapping area between the polygons and returns only this common area.
Difference A–B: Subtracts polygon B from polygon A and shows the area that belongs only to A.
Difference B–A: Subtracts polygon A from polygon B and shows the area that belongs only to B.

Note

The difference operations require exactly two polygons to be selected. If you select more, these options will be unavailable.

Starting point: Two overlapping polygons to be combined

Result of the union operation

Result of the intersection operation

Result of the difference A–B operation