Tool Name	Union
Tool ID	17
Library ID	shapes_polygons
Version	1.0
Author(s)	O.Conrad (c) 2003-25

Description

Calculates the geometric union of the overlaid polygon layers, i.e. the intersection plus the symmetrical difference of layers A and B.
Uses the free and open source software library Clipper created by Angus Johnson.

References

Clipper Homepage

Parameters

Name	Type	Identifier	Description	Constraints
Input
Layer A	shapes, input	A
Layer B	shapes, input	B
Output
Union	shapes, output	RESULT
Options
Split Parts	boolean	SPLIT	Set true if you want multipart polygons to become separate polygons.	Default: 1