[GRASS-user] r.surf.nnbathy interpolation to whole region

[Luigi Ponti]

Dear list,

I have successfully included natural neighbor interpolation in my 
mapping routine via r.surf.nnbathy: it seems slower (is that OK?) than 
v.surf.idw but sounds a lot more robust from what I have read around -- 
this is very useful if the interpolated raster is to be used for further 
analysis, beyond visualization.

Currently, the interpolated raster output I get from r.surf.nnbathy is 
confined to the convex hull delimited by the outermost input 
points/cells. Would there be a way to extend the interpolated raster to 
the whole current region as in v.surf.idw (in principle this seems 
possible: outer Voronoi cells just get bigger)?

By looking at r.surf.nnbathy code and nnbathy --help, it seems that 
nnbathy should produce a rectangular grid of <cols> by <rows>. What am I 
missing?

Thanks and regards,

Luigi