[GRASS-dev] [GRASS GIS] #2550: Polygons disappear after v.generalize simplification

GRASS GIS trac at osgeo.org
Sat Jan 17 05:44:14 PST 2015

#2550: Polygons disappear after v.generalize simplification
 Reporter:  dido                                            |       Owner:  grass-dev@…              
     Type:  defect                                          |      Status:  new                      
 Priority:  major                                           |   Milestone:  6.4.5                    
Component:  Vector                                          |     Version:  6.4.4                    
 Keywords:  Polygons disappear v.generalize simplification  |    Platform:  MSWindows 7              
      Cpu:  x86-64                                          |  

Comment(by mmetz):

 Replying to [ticket:2550 dido]:
 > Polygons disappear after v.generalize simplification.
 > A large rectangular polygon dataset is used with ~14 000 features.
 > Polygons are first processed with rmarea to remove all polygons of size
 900 m2. Then a simplification is executed with v.generalize using a factor
 of 10, all other parameters defaulted.
 > After simplification several large polygons are missing from the set
 rendering it useless.

 I can confirm the problem. This is a bug in the vector libraries regarding
 topology updating and has been fixed in GRASS 7. Please wait for GRASS
 7.0.0RC2 or use a daily build.

Ticket URL: <http://trac.osgeo.org/grass/ticket/2550#comment:3>
GRASS GIS <http://grass.osgeo.org>

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