[GRASS-dev] [GRASS GIS] #1865: WinGrass v.buffer memory issue

[GRASS GIS]

#1865: WinGrass v.buffer memory issue
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 Reporter:  feppink   |       Owner:  grass-dev@…              
     Type:  defect    |      Status:  new                      
 Priority:  blocker   |   Milestone:  6.4.4                    
Component:  Vector    |     Version:  6.4.3 RCs                
 Keywords:  v.buffer  |    Platform:  MSWindows 7              
      Cpu:  x86-64    |  
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Comment(by neteler):

 Replying to [ticket:1865 feppink]:
 > System: Windows 7 64-bit Home Basic, GRASS 6.4.3-RC2, core i7 3612QM,
 8Gb RAM.

 Here Linux, GRASS 6.4.svn (r59970), 8 GB RAM.

 > I have a vector map with a 30,131 primitives and well over 700,000
 vertices. I want to create buffers of 50,000 map units (meters) around the
 centroids of the primitives. If I do this, memory usage of v.buffer
 steadily creeps up and at some point GRASS runs out of memory and
 terminates v.buffer.

 I have made a test with the current v.buffer (which itself now uses GEOS),
 no (more?) memory issues:

 {{{
 # buffer polygons
 GRASS 6.4.4svn (eu_laea):~ > v.buffer clc2000_E45N25 out=buf distance=100
  100%
  100%
  100%
 Breaking polygons...
  100%
  100%
 Removing duplicates...
  100%
 Breaking boundaries...
 date%
  100%
 Removing duplicates...
  100%
 Cleaning boundaries at nodes
  100%
 Building topology for vector map <buf>...
 Building areas...
  100%
 200514 areas built
 16651 isles built
 Number of nodes: 239757
 Number of primitives: 641559
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 641559
 Number of centroids: 0
 Number of areas: 200514
 Number of isles: 16651
 Number of areas without centroid: 200514
 Removing dangles...
  100%
 Removing bridges...
  100%
 Attaching islands...
 Building topology for vector map <buf>...
 Attaching islands...
  100%
 Number of nodes: 239757
 Number of primitives: 641559
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 641559
 Number of centroids: 0
 Number of areas: 200514
 Number of isles: 16651
 Number of areas without centroid: 200514
 Calculating centroids for all areas...
  100%
 Generating list of boundaries to be deleted...
  100%
 Deleting boundaries...
  100%
 Calculating centroids for areas...
  100%
 Building topology for vector map <buf>...
 Registering primitives...
 1479 primitives registered
 10551 vertices registered
 Building areas...
  100%
 4 areas built
 4 isles built
 Attaching islands...
  100%
 Attaching centroids...
  100%
 Number of nodes: 1479
 Number of primitives: 1479
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 1478
 Number of centroids: 1
 Number of areas: 4
 Number of isles: 4
 Number of areas without centroid: 3
 }}}

 And
 {{{
 # buffer centroids
 GRASS 6.4.4svn (eu_laea):~ > v.buffer test out=buf2 distance=50
 type=centroid
 Buffering features...
  100%
 Cleaning buffers...
 Building parts of topology...
 [...]
 Attaching centroids...
  100%
 Number of nodes: 39266
 Number of primitives: 39266
 Number of points: 0
 Number of lines: 0
 Number of boundaries: 19674
 Number of centroids: 19592
 Number of areas: 19592
 Number of isles: 19592
 }}}

 Please try again.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/1865#comment:4>
GRASS GIS <http://grass.osgeo.org>