[GRASS-dev] Re: [GRASS GIS] #1429: r.watershed large grids

[GRASS GIS]

#1429: r.watershed large grids
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 Reporter:  dnewcomb     |       Owner:  grass-dev@…              
     Type:  enhancement  |      Status:  new                      
 Priority:  normal       |   Milestone:  7.0.0                    
Component:  Default      |     Version:  svn-trunk                
 Keywords:  Large grids  |    Platform:  Linux                    
      Cpu:  x86-64       |  
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Comment(by mmetz):

 Replying to [ticket:1429 dnewcomb]:
 > tried r.watershed on a large elevation grid (51000 rows, 133000 columns,
 6783000000 cells)

 For larger grids, GRASS must be compiled with LFS: configure --enable-
 largefile, and quite a bit of free disk space must be available where the
 current location is living.

 Apart from that, 6783000000 cells are currently too much, see recent
 similar post in the user ml [0]. The current limit is 2^31^ - 1 =
 2,147,483,647 cells. This can be overcome in trunk, but requires quite a
 few modifications both in the segment library and in r.watershed.

 Markus M

 [0] http://lists.osgeo.org/pipermail/grass-user/2011-August/061724.html

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1429#comment:1>
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