[postgis-tickets] [PostGIS] #5146: ST_AlphaShape and ST_OptimalAlphaShape need more examples

[PostGIS]

#5146: ST_AlphaShape and ST_OptimalAlphaShape need more examples
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 Reporter:  robe           |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 3.3.0
Component:  documentation  |    Version:  master
 Keywords:                 |
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 I was trying to add some of the same examples that are in ST_ConcaveHull
 to ST_AlphaShape and ST_OptimalAlphaShape.

 Sadly for ST_AlphaShape all my attempts ended in Empty Geometry.

 I had much more success with ST_OptimalAlphaShape, but still not quite as
 good with the examples as ST_ConcaveHull.

 I think it's mostly my understanding of they extra arguments and the docs
 aren't clear enough (in ours or CGAL site) for me to follow.

 I also don't think these functions work with anything but Points as all my
 attempts at feeding in a polygon ended in Empty geometry.  Need a note
 about that if that is true.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5146>
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