[GRASS-dev] [GRASS GIS] #2563: r.grow.distance: define max distance

[GRASS GIS]

#2563: r.grow.distance: define max distance
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  Reporter:  mlennert     |       Owner:  grass-dev@…                     
      Type:  enhancement  |      Status:  closed                          
  Priority:  normal       |   Milestone:  7.1.0                           
 Component:  Raster       |     Version:  svn-trunk                       
Resolution:  invalid      |    Keywords:  r.grow.distance maximum distance
  Platform:  Unspecified  |         Cpu:  Unspecified                     
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Changes (by mlennert):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 Replying to [comment:1 glynn]:
 > Replying to [ticket:2563 mlennert]:
 > > It would be nice if r.grow.distance allowed to define a maximum
 distance. The module could then stop calculating once this maximum
 distance is attained (e.g. similar to r.cost's max_cost option). This
 should probably accelerate the module if only short distances are needed
 from the starting points.
 >
 > It wouldn't have the slightest effect upon performance. r.grow.distance
 doesn't operate in order of increasing distance. It operates row-by-row in
 two passes, from top-to-bottom then bottom-to-top, recording the distance
 to the closest point seen so far.

 Ok, so the only way to limit the distance is to determine the smallest
 region that would include the max distance.

 Closing this as invalid.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2563#comment:2>
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