[PostGIS] #6136: ST_MakeValid merges polygons in a MultiPolygon.

PostGIS trac at osgeo.org
Tue Sep 29 12:42:36 PDT 2026


#6136: ST_MakeValid merges polygons in a MultiPolygon.
--------------------------------+---------------------------
  Reporter:  Lars Aksel Opsahl  |      Owner:  pramsey
      Type:  defect             |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.6.5
 Component:  postgis            |    Version:  3.6.x
Resolution:                     |   Keywords:
--------------------------------+---------------------------
Comment (by Lars Aksel Opsahl):

 In the input polygon there is one this

 {{{
 NOTICE:  00000: Self-intersection at or near point 8.6679318543637205
 59.6015148042639
 }}}

 The intersection is very small and is not visible under normal conditions.

 However, this causes all polygons to be merged into a single polygon that
 are connected, even those that are not related to the point
 8.6679318543637205 59.6015148042639 ,

 With the parameters below, the problem remains the same.

 'method=structure keepcollapsed=false' and 'method=structure
 keepcollapsed=true'
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/6136#comment:1>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.


More information about the postgis-tickets mailing list