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Union

This tool allows you to compute the geometric union of features from two layers.

1. Explanation​

Combines features from two polygon layers into a single layer. The output includes all the geometry from both inputs (like a boolean OR operation). Where features overlap, they are split, and attributes from both layers are assigned to the overlapping portions. Non-overlapping areas retain attributes only from their original layer.

Buffer Types

2. Example use cases​

  • Combine two different land use datasets into a single comprehensive map.
  • Merge zoning districts with school districts to analyze all unique combinations of administrative boundaries.

3. How to use the tool?​

1
Click on Toolbox Options.
2
Under the Geoprocessing menu, click on Union.
3
Select the first Input layer.
4
Select the second layer on Overlay layer.
5
Choose the Overlay Fields Prefix which will be added to the attributes from the overlay layer to distinguish them in the output.
6
Click Run to execute the union. Result will be added to the map.