union
Calculates the union of a collection of geometries. The union combines those parts of the input geometries which overlap into a single geometry.
If the collection contains geometries of differing dimensionality, the geometry with the higher dimensionality is returned. For example, a polygon is returned if the given a collection contains polygons, polylines, and points.
Supports true curves.
Return
The union of all the geometries in the given collection, or null if the geometries do not have equivalent spatial references.
Since
200.1.0
Parameters
geometries
A collection of geometries.