#603: r.neighbors with an output reference map
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 Reporter:  frankie      |       Owner:  [email protected]
     Type:  enhancement  |      Status:  new                      
 Priority:  normal       |   Milestone:  6.4.0                    
Component:  default      |     Version:  6.4.0 RCs                
 Keywords:               |    Platform:  All                      
      Cpu:  Unspecified  |  
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 If r.neighbours accepted a reference mask to compute convolution only on
 non masked points, it could reduce significantly computing time on large
 datasets and/or large window sizes. Of course that could be done after the
 whole map computation, but computing time would change significantly.
 Note that this is different from having an ordinary MASK applied to the
 input map, because the input raster is not masked out at all at
 convolution time.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/603>
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