[geos-devel] [GEOS] #1101: Negative buffer does not return empty geometry

[GEOS]

#1101: Negative buffer does not return empty geometry
------------------------+--------------------------
 Reporter:  uclaros     |      Owner:  geos-devel@…
     Type:  defect      |     Status:  new
 Priority:  major       |  Milestone:  3.9.2
Component:  Default     |    Version:  3.9.0
 Severity:  Unassigned  |   Keywords:
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 In specific cases of 4 sided polygons, running a specific negative buffer
 erroneously returns a polygon instead of an empty geometry.
 In shapely:

 {{{
 from shapely import wkt
 p=wkt.loads('POLYGON ((646990.625 5344959.438, 646994.486 5344963.053,
 646999.7389999999 5344957.423, 646995.9157765866 5344952.851883921,
 646990.625 5344959.438))')
 p.buffer(-4.2,0)
 # does not return empty
 p.buffer(-3.2,0)
 # correctly returns empty
 }}}

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Ticket URL: <https://trac.osgeo.org/geos/ticket/1101>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).