[postgis-tickets] [PostGIS] #4763: Docs that use ST_BuildArea are wrong but they are more beautiful than the right docs would be

PostGIS trac at osgeo.org
Mon Oct 5 15:08:32 PDT 2020


#4763: Docs that use ST_BuildArea are wrong but they are more beautiful than the
right docs would be
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.0.3
 Component:  postgis  |    Version:  3.0.x
Resolution:           |   Keywords:
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Comment (by strk):

 Ok I think I got it: the non-noded input in the documentation would have
 resulted in only 2 polygons out of Polygonizer, and the iterative
 symdifference would result in the given image.

 Now, with the new algorithm, you just never get that result from that
 input with ST_BuildArea.
 But you can get it with ST_MakeValid, if the input is an invalid
 MULTIPOLYGON

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4763#comment:3>
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