[GRASS-dev] Re: [GRASS GIS] #399: Added "backlink" functionality to r.walk, r.cost & r.drain

GRASS GIS trac at osgeo.org
Thu Mar 12 14:08:05 EDT 2009

#399: Added "backlink" functionality to r.walk, r.cost & r.drain
  Reporter:  cnielsen     |       Owner:  grass-dev at lists.osgeo.org
      Type:  enhancement  |      Status:  new                      
  Priority:  major        |   Milestone:  6.4.0                    
 Component:  Raster       |     Version:  unspecified              
Resolution:               |    Keywords:                           
  Platform:  All          |         Cpu:  All                      
Comment (by dylan):

 Just re-compiled GRASS with Colin's recent patches to r.cost, r.drain, and
 r.walk. Compiles fine against develbranch_6 on linux, with visibly
 different results. Using the output direction update to r.cost/r.drain
 does not appear to differ much from the original implementation. The
 results from r.walk/r.drain using the output direction patch results in
 considerably differences-- that appear to be non-optimal in this terrain.
 Code and resulting output posted here:


 Thanks for the work on these modules. I wonder if using more than the
 cardinal directions would result in a more realistic "direction map".

Ticket URL: <http://trac.osgeo.org/grass/ticket/399#comment:19>
GRASS GIS <http://grass.osgeo.org>

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