[GRASS-user] a few suggestions and questions

[Dylan Beaudette]

On Wednesday 05 March 2008, Jarek Jasiewicz wrote:
> Dylan Beaudette wrote:
> > On Monday 03 March 2008, Jarosław Jasiewicz wrote:
> >> Nikos Alexandris pisze:
> >>> On Mon, 2008-03-03 at 22:52 -0300, Carlos "Guâno" Grohmann wrote:
> >>>> Hello all
> >>>
> >>> [...]
> >>>
> >>>> is plan curvature in r.param.scale broken? I can't get a map of it.
> >>>> profc works fine. Also is it possible to make r.param.scale work in
> >>>> latlong regions? (please?)
> >>
> >> it is imposible due to polinominal fitting when window is more than 3
> >
> > This may reveal my level of understanding of the r.param.scale module,
> > but why should the profile curvature be impossible to calculate when the
> > window size is > 3x3 ?
> >
> > Thanks
> >
> > Dylan
> >
> >>> Probably not! Just tested... and it says: Lat/Long location is not
> >>> supported
> >>>
> >>> Maybe check the PhD thesis:
> >>> www.soi.city.ac.uk/~jwo/phd/
> >>>
> >>>
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> >>
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>
> I analised the code of (I need that solution for some other problem).
> The module use polinominal fitting to calculate is written to work on
> rectangular grid, so program shoud be compeeltly rewriten to use
> lat-long. As far as I know - r.param scale is now development as
> Landserf maybe try this but I cant say if landserf can work on lat-long
> (I suppose - yes)

Ah- OK. It looks like the problem is with the fitting of polynomials in LL 
locations, and NT the > 3x3 grid / plan curv. problem-- that must be related 
to a bug.

I don't see a ticket for r.param.scale on the trac site.

Carlos- can you please create one with any example you might have?

Thanks,

Dylan

-- 
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341