[postgis-tickets] [PostGIS] #4389: ST_SimplifyPreserveTopology doesn't always preserve topology with inner holes

[PostGIS]

#4389: ST_SimplifyPreserveTopology doesn't always preserve topology with inner
holes
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  Reporter:  pnorman  |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.5.3
 Component:  postgis  |    Version:  2.5.x
Resolution:           |   Keywords:
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Comment (by mdavis):

 This is a  known bug in the original JTS implementation (see
 [http://locationtech.github.io/jts/javadoc/org/locationtech/jts/simplify/TopologyPreservingSimplifier.html
 Javadoc] ).

 As mentioned there, the workaround is to simply remove holes which lie
 outside the polygon shell.  But of course this needs to be implemented in
 GEOS (and JTS too ideally).  There should be a GEOS ticket created for
 this.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4389#comment:1>
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