[geos-devel] Union of linestrings

Mateusz Loskot mateusz at loskot.net
Tue Mar 1 05:52:32 PST 2016

On 29 February 2016 at 20:10, Sandro Santilli <strk at keybit.net> wrote:
> 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.


What about constructing a single LineString from connected
segments, instead of a MultiLineString?

What are the criteria in such case?

Best regards,
Mateusz Łoskot, http://mateusz.loskot.net

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