[postgis-tickets] [PostGIS] #2638: geography ST_Intersects bugginess with Polygon/multilinestring M

[PostGIS]

#2638: geography ST_Intersects bugginess with Polygon/multilinestring M
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 Reporter:  robe     |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  medium   |   Milestone:  PostGIS 2.0.5
Component:  postgis  |     Version:  2.1.x        
 Keywords:           |  
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Comment(by robe):

 I just realized that ST_Intersects uses the sphere distance rather than
 the default spheroid distance and we already know from #2634 , #2636 that
 using sphere distance is unstable.  So this may be a different
 manifestation of the same bug looked at a different angle.  You said 2.1
 now reads from spatial_ref_sys instead of a hard-coded sphere. I wonder if
 that is somehow adding to the perceived instability.

 anyrate it sure seems to be tripped up by the M coordinate when it
 shouldn't care.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2638#comment:7>
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