[postgis-devel] [PostGIS] #1545: ST_SimplifyPreserveTopology creates invalid geometries

[PostGIS]

#1545: ST_SimplifyPreserveTopology creates invalid geometries
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 Reporter:  strk     |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  medium   |   Milestone:  PostGIS 2.0.0
Component:  postgis  |     Version:  trunk        
 Keywords:           |  
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Comment(by strk):

 Example:
 {{{
 =# select ST_AsText(geom), ST_IsValid(geom),
 st_astext(ST_SimplifyPreserveTopology(geom,200)),
 ST_IsValid(ST_SimplifyPreserveTopology(geom, 200)) from ( select
 'LINESTRING(0 0, 5 0, 5 5, 0 0)'::geometry as geom ) as f;
 NOTICE:  Too few points in geometry component at or near point 0 0
 -[ RECORD 1 ]---------------------------
 st_astext  | LINESTRING(0 0,5 0,5 5,0 0)
 st_isvalid | t
 st_astext  | LINESTRING(0 0,0 0)
 st_isvalid | f
 }}}

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1545#comment:1>
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