[GRASS-dev] Re: [GRASS GIS] #1088: r.fillnulls: support other interpolation methods

[GRASS GIS]

#1088: r.fillnulls: support other interpolation methods
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 Reporter:  kyngchaos    |       Owner:  grass-dev@…              
     Type:  enhancement  |      Status:  new                      
 Priority:  normal       |   Milestone:  6.5.0                    
Component:  Raster       |     Version:  svn-develbranch6         
 Keywords:  fillnulls    |    Platform:  All                      
      Cpu:  All          |  
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Comment(by kyngchaos):

 Markus, see my patch.  It's very similar to what you describe.  A couple
 notes/questions:

 I didn't completely understand the description for the sparse option, but
 it didn't look like it was needed here.  Now it looks to me like it's
 essentially a mask option, like the maskmap option in v.surf.rst.  For
 now, the mask is implied when the results are patched into the original
 raster.  I guess a mask option (if sparse is such) only makes sense if it
 reduces processing time by ignoring the masked areas.

 The description says 1 * resolution was good for regularly spaced points,
 which is what we get from a raster.  Why 2* in your method?

 For the lambda, the docs are unclear what orders of numbers have effects,
 beyond "the larger the number the more smoothing applied".  The default is
 one.  You say 0.001-0.01 work well.  I figured 1 was something like 1*, or
 no smoothing.  Can you clarify this option?

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1088#comment:8>
GRASS GIS <http://grass.osgeo.org>