[postgis-tickets] [PostGIS] #4541: ST_ConcaveHull returns a "geometrycollection" type instead of the expected "polygon"

[PostGIS]

#4541: ST_ConcaveHull returns a "geometrycollection" type instead of the expected
"polygon"
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  Reporter:  v89461   |      Owner:  robe
      Type:  defect   |     Status:  reopened
  Priority:  high     |  Milestone:  PostGIS 2.5.5
 Component:  postgis  |    Version:  2.5.x
Resolution:           |   Keywords:
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Comment (by robe):

 @kszafran

 Which platform are you running on?  Wondering if by chance you are able to
 test the new ST_ConcaveHull.  If you are on windows I have precompiled
 builds in experimental section - https://postgis.net/windows_downloads/  -
 the 3.3.0alpha1 builds.

 The new ST_ConcaveHull will use the new native GEOS support introduced in
 GEOS 3.11 (not yet released).  At anyrate I'll try with your example later
 this week to make sure it solves your issue -
 https://postgis.net/docs//manual-3.3/ST_ConcaveHull.html

 on a related topic, there is also support for alphashapes introduced in
 PostGSI 3.3.0 SFCGAL 1.4.1

 https://postgis.net/docs//manual-3.3/ST_OptimalAlphaShape.html
 https://postgis.net/docs//manual-3.3/ST_AlphaShape.html
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4541#comment:11>
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