[postgis-tickets] [PostGIS] #3464: ERROR: lwt_ChangeEdgeGeom could not construct face X, on the left of edge Y

[PostGIS]

#3464: ERROR: lwt_ChangeEdgeGeom could not construct face X, on the left of edge Y
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS Future
 Component:  topology  |    Version:  trunk
Resolution:            |   Keywords:  robustness
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Comment (by strk):

 When adding the second component of the 4 components in which the original
 line is split, the algorithm in trunk (and 2.2) fails to find it crossing
 an existing edge.
 In PostGIS-2.2.1 it is actually found crossing (SQL/MM Spatial exception -
 geometry crosses edge 2).

 It occurs to me that the "crossing" could actually be determined by
 looking at the left/right faces as computed looking at the starting node
 and at the ending node. I might finally got to understand the concept of
 "side-location conflict" that's often thrown by GEOS/JTS.

 Dr Martin are you listening ? :)

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3464#comment:10>
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