[GRASS-user] Re: TIN (Linear interpolation) from points

[Vincent Bain]

r.surf.nnbathy accepts three interpolation methods, among which delaunay
interpolation (alg=l). Have a look on the the add-on man page for more
information on each method.

>From your vector points, you need to produce a raster map via v.to.rast.

first, set region resolution in order to adjust raster points density to
input vector points
Then run r.surf.nnbathy on the resulting point raster map.

Vincent

Le samedi 17 mars 2012 à 08:15 -0700, TheGeographer a écrit :
> Vincent Bain wrote
> > 
> >> @Vincent: I need linear triangulation. 
> > 
> > Yes, this is what r.surf.nnbathy does. In other words, you obtain a
> > faceted surface where triangles summits meet input points.
> > 
> 
> Ok, but i use vector points as input data. And the module needs a raster
> map. 
> 
> Are the interpolation results very different between linear interpolation
> and natural neighbor?
> The r.surf.nnbathy uses only natural neighbor as interpolation method. 
> 
> 
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