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

[PostGIS]

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

Comment(by dustymugs):

 So for a simple bow-tie situation, ST_DumpAsPolygons returns two polygons

 {{{
 WITH foo AS (
         SELECT
                 ST_SetValue(
                         ST_SetValue(
                                 ST_AddBand(
                                         ST_MakeEmptyRaster(2, 2, 0, 0, 1,
 1, 0, 0, 0)
                                         , '8BUI'::text, 0, 0
                                 )
                                 , 1, 1, 1
                         )
                         , 2, 2, 1
                 ) AS rast
 )
 SELECT
         ST_AsText((ST_DumpAsPolygons(rast)).geom)
 FROM foo
 }}}

 Need to find an example of a raster dumping invalid polygons.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1586#comment:9>
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.