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Help to Evaluation Digital Terrain Model (DTM)
2 messages · gianni lavaredo, 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 [[alternative HTML version deleted]]
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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