[postgis-devel] [PostGIS] #845: ST_Intersects() precision error - returns false instead of true

[PostGIS]

#845: ST_Intersects() precision error - returns false instead of true
------------------------+---------------------------------------------------
 Reporter:  cdestigter  |       Owner:  pramsey      
     Type:  defect      |      Status:  new          
 Priority:  medium      |   Milestone:  PostGIS 2.0.0
Component:  postgis     |     Version:  1.5.X        
 Keywords:              |  
------------------------+---------------------------------------------------

Comment(by strk):

 I've tried switching point_in_polygon to use the crossing pt_in_ring_2d
 and got failures with within and contains:

 {{{
 --- regress_ogc_expected        2011-01-04 09:54:58.000000000 +0100
 +++ /tmp/pgis_reg_12408/test_39_out     2011-02-24 14:04:39.000000000
 +0100
 @@ -10,9 +10,9 @@
  crosses|f
  crosses|t
  within100|t
 -within101|f
 +within101|t
  within102|f
 -within103|f
 +within103|t
  within104|f
  within105|t
  within106|t
 @@ -45,9 +45,9 @@
  intersects155|t
  intersects156|f
  contains100|t
 -contains101|f
 +contains101|t
  contains102|f
 -contains103|f
 +contains103|t
  contains104|f
  contains105|t
  contains106|t
 }}}

 Those tests might need a double-check for correctness, but anyway both
 'within' and 'contains' make a distinction between _inside_ and
 _on_the_boundary_, which pt_in_ring_2d doesnt' do.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/845#comment:16>
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.