[postgis-devel] [PostGIS] #1046: Invalid geography polygons: BOOM! Could not generate outside point!

PostGIS trac at osgeo.org
Tue Jun 21 08:19:44 PDT 2011


#1046: Invalid geography polygons: BOOM! Could not generate outside point!
----------------------------+-----------------------------------------------
 Reporter:  mwtoews         |       Owner:  pramsey      
     Type:  defect          |      Status:  new          
 Priority:  medium          |   Milestone:  PostGIS 2.0.0
Component:  postgis         |     Version:  1.5.X        
 Keywords:  geography boom  |  
----------------------------+-----------------------------------------------

Comment(by pramsey):

 No, it is a different issue. The point-in-polygon test in geography
 involves generating a point that is definitively outside the area, then
 counting the number of times the boundary intersects with the maybe-inside
 point. As you can imagine, the weakness is being to generate a point that
 is definitively outside of an arbitrary area on the sphere.

 This is more computational geometry and the work of ages.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1046#comment:2>
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