[GRASS-dev] Re: r.surf.nnbathy + v.out.ascii?
tutey at o2.pl
Sun Dec 17 20:07:34 CET 2006
Thanks for feedback!
> I've added a new -r flag and fs= option to v.out.ascii in CVS which may
> make it more appropriate than having to run v.to.rast first to make a
> raster grid.
But if the input is contour lines? Rasterising it and interpolating the
raster seems the best way to go.
> beware the -r flag (only export within current region) is 3D aware, so
> top and bottom region settings matter.
> I thought I remembered something about the input to nnbathy input
> needing to be sorted by Y value. Is this true? Does it have to be
> gridded or can in be randomly spaced?
It can be randomly spaced as you wish. Natural neighbor interpolation
is an excellent approach for gridding random, clustered input.
> r.surf.nnbaty additions:
> #% key: vect
> #% type: string
> #% gisprompt: old,vector,vector
> #% description: The 3D points vector to interpolate
Like I said - this would work only with vector points I guess. Please
correct me if I'm wrong.
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