[R-sig-Geo] Help to Evaluation Digital Terrain Model (DTM)

[Paul Hiemstra]

On 08/30/2010 03:54 PM, gianni lavaredo wrote:
> Dear Researchers,
>
> sorry for the first email but i have connection problem
>
> I am writing a code to evaluate several interpolation methods to create a
> DEM from LiDAR points. I read in bibliography several papers and methods,
> but same methods I didn't find inside the library:
>    
Hi Gianni,

I'm not sure what you tried when you looked, but you could try this in 
an R session:

??'idw'
??'spline'
??'nearest neighbor'

Or google it:

"r nearest neighbor"
"r thin plate spline"

This got me a lot of results that should be helpful to you. In addition, 
I see no kriging type interpolations, any reason to exclude them?

cheers,
Paul
> Methods
> Inverse distance weighted = library RSAGA
> completely regularised spline =  ??
> thin plate splines = library RSAGA
> splines with tension = ??
> inverse quadratic = ??
> natural neighbour = library RSAGA (there is a problem)
> Nearest Neighbour = library RSAGA
> Modifed Quadratic Shepard = library RSAGA
> Multilevel B-Spline Interpolation = library RSAGA
>
> are there another library with the missing interpolation methods?
>
> thanks in advance
> Gianni
>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 253 5773
http://intamap.geo.uu.nl/~paul
http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770