#1031: Union of two Polygons results in GeometryCollection
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Reporter: brownjt | Owner: geos-devel@…
Type: defect | Status: closed
Priority: minor | Milestone: 3.10.0
Component: Default | Version: 3.8.0
Severity: Unassigned | Resolution: invalid
Keywords: |
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Comment (by mdavis):
The result is reflecting the fact that the vertices of the two polygons
are slightly different to each other. In fact polygon A has a vertex
which creates a triangle slightly outside polygon B. The difference is
so small that the triangle collapses to a line. (See attached image).
The overlay algorithm is able to compute geometry for these situations,
and optionally provide it (as a way of seeing where collapses have
occurred). As Paul said, for backwards compatibility reasons by default
the collapses are returned in the result.
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Ticket URL: <https://trac.osgeo.org/geos/ticket/1031#comment:5>
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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