Intersections and Unions

Geometry API Union operation calculated union of pair or more geometries (polygons or multi-polygons) previously generated with Geoapify APIs. For example, you can calculate union of isolines.

The typical Union operation request URL looks like:


https://api.geoapify.com/v1/geometry?operation=union&id=2b9fdc45ae26402deb37fbf850b3872b&id=509ac02411371d301e01d76870133246&id=bb95e9cd0b10c41501c51fd6626aac79&apiKey=YOUR_API_KEY


  • operation - name of the operation. Possible values: "union", "intersection";
  • id - id of a geometry. The id is provided in the response of previously called API
  • apiKey - your Geoapify key

NOTE! A call to geometry API is charged as a call to Places or Geocoding API. However, one call is calculated for each geometry pair. So if you provide 4 ids in the request, it will be calculated as 3 requests.