[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 mmetz):

 Replying to [comment:9 mmetz]:
 > Replying to [comment:8 kyngchaos]:
 > > 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.
 >
 > Right. Unfortunately, using sparse points as input for v.surf.bspline
 does not reduce processing time substantially, although it could be
 implemented similar to what I did for r.resamp.bspline.

 I just noticed that I did implement it, interpolation in v.surf.bspline is
 skipped if a sparse points vector is given but no sparse points fall into
 the current subregion. The advantage of the sparse points approach for
 filling NULL cells would be that more than the currently 3 cells around a
 gap are used for interpolation, providing (in theory) better results for
 larger gaps.

 Markus M

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1088#comment:10>
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