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

GRASS GIS trac at osgeo.org
Tue Jan 27 07:55:25 PST 2015

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

Comment(by 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.

Ticket URL: <https://trac.osgeo.org/grass/ticket/2563#comment:1>
GRASS GIS <http://grass.osgeo.org>

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