# ibis.expr.api.GeoSpatialColumn.unary_union¶

GeoSpatialColumn.unary_union()

Aggregate a set of geometries into a union.

This corresponds to the aggregate version of the PostGIS ST_Union. We give it a different name (following the corresponding method in GeoPandas) to avoid name conflicts with the non-aggregate version.

Parameters

arg (geometry column) –

Returns

union

Return type

geometry scalar