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

[Brad Douglas]

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