[GRASS-dev] A better r.fillnulls

[Andy Wickert]

Hi GRASS-dev,

When I use r.fillnulls, I am often faced with the problem that it breaks
the domain up into blocks, thus (1) creating discontinuities and/or (2)
having problems in regions where there is insufficient data. (2) is
important because I am often trying to just create some smooth variation
between two datasets or fill in less-important regions to have a full grid
to be able to run a utility or model.

My workaround as of now is this:

r.to.points in=map out=map type=point column=attrcol
v.surf.bspline in=map raster_output=mapSplines column=attrcol
# But the spline fit makes the real data blurry too, so patch the spline fit
# in-between the data points
r.patch in=map,mapSplines out=mapFilled

I find this to be preferable for both the reasons stated above, and was
wondering if it would be worthwhile to think about including multiple
methods for r.fillnulls so one could do something like this too.

Andy
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