[postgis-devel] [PostGIS] #1855: 'SQL/MM Spatial exception - curve not simple' exception at adding two polygons

[PostGIS]

#1855: 'SQL/MM Spatial exception - curve not simple' exception at adding two
polygons
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 Reporter:  wimned    |       Owner:  strk         
     Type:  defect    |      Status:  assigned     
 Priority:  medium    |   Milestone:  PostGIS 2.0.1
Component:  topology  |     Version:  2.0.x        
 Keywords:            |  
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Comment(by strk):

 Another example simpler to understand, and harder to fix:

 {{{
 SELECT CreateTopology('t');
 SELECT topogeo_AddLinestring('t', 'LINESTRING(0 0, 0 100)');
 SELECT topogeo_AddLinestring('t', 'LINESTRING(10 51, -100 50, 10 49)', 2);
 }}}

 The intersection points are closer than the tolerance.
 The code fails at consistently merging them into a single node.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/1855#comment:9>
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