[geos-devel] Union of linestrings

Sandro Santilli strk at keybit.net
Mon Feb 29 11:10:52 PST 2016

On Mon, Feb 29, 2016 at 07:18:08PM +0100, Mateusz Loskot wrote:
> Hi,
> I've started adding tests for OverlayOp [1] and I noticed
> curious results for basic test case.
> OverlayOp(UNION) on Four segments of a sqare
> always construct a MultiLineString.
> I'd have expected a polygon, shouldn't I?

No, you shouldn't.
The union of lines do not yeld an area.
You can use the Polygonizer class to build polygons
from linework.


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