[GRASS-user] nulls left by r.surf.nnbathy

[Robert Nuske]

> Nick Cahill wrote:
> > I'm trying to create a dem from digitized contour lines with
> > r.surf.nnbathy. I've started with vector contour lines, converted them
> > to a raster with v.to.rast, then interpolate these using r.surf.nnbathy.
> > The output looks good, except that it is speckled with random-looking
> > null cells, as in the enclosed screen shot (white are nulls)
> >
> > I can't figure out what is causing these: some are on a contour line,
> > some are between contours; I don't see an obvious pattern. Is this a
> > known issue with r.surf.nnbathy, and if so, is there a workaround?
>
> Hi Nick,
>
> Glad to see somebody using it!
>
> I haven't had such an issue on my Linux box. 

I had the same problem as Nick and couldn't figure what is causing these
speckles. While collecting cases for a report i decided not to interpolate the 
data at all. 


cheers,
  robert