#974: Union of Polylines results in additional segments ------------------------+------------------------------ Reporter: jerryfaust | Owner: geos-devel@… Type: defect | Status: new Priority: minor | Milestone: Component: Default | Version: 3.4.2 Severity: Unassigned | Keywords: UNION UNARYUNION ------------------------+------------------------------ Hello.
Hopefully I'm overlooking something simple. I am selecting a group of roads. I want to Union and Buffer them in order to search within the resulting polygon. However, when I get back the union, there are additional line segments that did not exist in the original set. I've tried individually Union'ing them, I've tried UnaryUnion of a multi- part polyline (MultiLineString). I've also clipper calls. And I always get a similar result. I've tried reording the lines as I union them [[Image()]]so that each union operation always involves line segments that touch eachother. I'm hoping that there is something that I'm simply overlooking, or not understanding, or not using properly. I'm attaching a snapshot of the circle used to 'select' the streets. I'm expecting a result something like a '#' sign, or tic-tac-toe. But I get additional diagonal lines in the result set. Thank you for any feedback. Regards. Jerry. -- Ticket URL: <https://trac.osgeo.org/geos/ticket/974> GEOS <http://trac.osgeo.org/geos> GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).
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