[GRASS-dev] [GRASS GIS] #397: v.clean creates polygons instead of holes

[GRASS GIS]

#397: v.clean creates polygons instead of holes
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 Reporter:  cgsbob       |       Owner:  grass-dev at lists.osgeo.org
     Type:  defect       |      Status:  new                      
 Priority:  major        |   Milestone:  6.4.0                    
Component:  Vector       |     Version:  unspecified              
 Keywords:               |    Platform:  Unspecified              
      Cpu:  Unspecified  |  
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 I'm having problems with this sequence of commands:
     r.to.vect -s input=lszone output=lszone10 feature=area
     v.clean input=lszone10 output=lszone10_clean tool=rmarea thresh=2800

 Below is the output and I've attached a jpeg to illustrate the problem.

 Overlaying lszone and lszone10_clean, I see that there are large holes
 that have been replaced with polygons.  Is this a bug?

 Btw, I've tried this with QGIS on Windows XP as well as GRASS 6.4.svn with
 the same results.

 Bob


 ======================================================================
 r.to.vect -s in=lszone out=lszone10 feature=area
 Extracting areas...
  100%
  100%
 Building topology for vector map <lszone10>...
 Registering primitives...
 50074 primitives registered
 629002 vertices registered
 Building areas...
  100%
 27613 areas built
 17107 isles built
 Attaching islands...
  100%
 Attaching centroids...
  100%
 Number of nodes: 39568
 Number of primitives: 50074
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 33886
 Number of centroids: 16188
 Number of areas: 27613
 Number of isles: 17107
 Number of areas without centroid: 11425
 r.to.vect complete.
 v.clean in=lszone10 out=lszone10_clean tool=rmarea thresh=2800
 --------------------------------------------------
 Tool: Threshold
 Remove small areas: 2.800000e+03
 --------------------------------------------------
 Copying vector lines...
 Rebuilding parts of topology...
 Building topology for vector map <lszone10_clean>...
 Registering primitives...
 50074 primitives registered
 629002 vertices registered
 Building areas...
  100%
 27613 areas built
 17107 isles built
 Attaching islands...
  100%
 Attaching centroids...
  100%
 Number of nodes: 39568
 Number of primitives: 50074
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 33886
 Number of centroids: 16188
 Number of areas: 27613
 Number of isles: 17107
 Number of areas without centroid: 11425
 --------------------------------------------------
 Tool: Remove small areas
 26251 areas of total size 9.34119e+06 removed
 --------------------------------------------------
 Rebuilding topology for output vector map...
 Building topology for vector map <lszone10_clean>...
 Registering primitives...
 4913 primitives registered
 222687 vertices registered
 Building areas...
  100%
 1362 areas built
 1127 isles built
 Attaching islands...
  100%
 Attaching centroids...
  100%
 Number of nodes: 4678
 Number of primitives: 4913
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 4185
 Number of centroids: 728
 Number of areas: 1362
 Number of isles: 1127
 Number of duplicate centroids: 3
 Number of areas without centroid: 637

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Ticket URL: <http://trac.osgeo.org/grass/ticket/397>
GRASS GIS <http://grass.osgeo.org>