[postgis-devel] [PostGIS] #1586: [raster] st_dumpaspolygons makes not valid polygons

PostGIS trac at osgeo.org
Mon Feb 20 10:38:28 PST 2012

#1586: [raster] st_dumpaspolygons makes not valid polygons
 Reporter:  jomarlla  |       Owner:  pracine      
     Type:  defect    |      Status:  new          
 Priority:  high      |   Milestone:  PostGIS 2.0.0
Component:  raster    |     Version:  trunk        
 Keywords:            |  

Comment(by jomarlla):

 ST_Makevalid is making st_dumpaspolygons much slower. Dont know if it is
 worth it to do it at the source. I was wondering if the algorithm can be
 changed for not making invalid polygons instead of using st_makevalid
 without a lot of work.

 I just dont like invalid polygons because they just bother me about any
 future spatial analysis about unpredictable results.
 As you said users can do it easily but in that case maybe the docs should
 point out that st_dumpaspolygons can return invalid geometries, then the
 user can take care about that.


Ticket URL: <https://trac.osgeo.org/postgis/ticket/1586#comment:4>
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