gis.geos.GEOSGeometry.unary_union

GEOSGeometry.unary_union

Computes the union of all the elements of this geometry.

The result obeys the following contract:

• Unioning a set of LineStrings has the effect of fully noding and dissolving the linework.
• Unioning a set of Polygons will always return a Polygon or MultiPolygon geometry (unlike GEOSGeometry.union(), which may return geometries of lower dimension if a topology collapse occurs).