R: [GRASS-user] Profile and tangential curvatures in r.slope.aspect

[Aldo Clerici]

Thanks to Brad for the answer.
I read the paper(s) of Mitasova but they refer to Interpolation by Spline
(s.surf.tps). 
Does anybody know some paper explaining with more details the use of "..3rd
order finite difference....." in r.slope.aspect?
Many thanks again and best regards.
Aldo Clerici
 

> -----Messaggio originale-----
> Da: Brad Douglas [mailto:rez at touchofmadness.com]
> Inviato: martedì 10 ottobre 2006 22.52
> A: aldo.clerici at unipr.it
> Cc: grassuser at grass.itc.it
> Oggetto: Re: [GRASS-user] Profile and tangential curvatures 
> inr.slope.aspect
> 
> On Tue, 2006-10-10 at 16:29 +0200, Aldo Clerici wrote:
> > Dear GRASSusers.
> > Is there a paper (or manual, or tutorial) explaining how
> profile and
> > tangential curvatures (pcurv and tcurv)are computed in
> r.slope.aspect?
> > 
> > Many thanks in advance
> 
> You may refer to Helena, et. al, papers titled, "Interpolation by 
> Regularized Spline with Tension".  They can be found on Helena's page 
> (under publications):
> http://skagit.meas.ncsu.edu/~helena/gmslab/
> 
> IIRC, it uses 3rd order finite difference weighted by reciprocal of 
> squared distance implemented in a 3x3 moving window.
> 
> 
> -- 
> Brad Douglas <rez touchofmadness com>                    KB8UYR/6
> Address: 37.493,-121.924 / WGS84    National Map Corps #TNMC-3785
>