[GRASSLIST:10827] Re: other methods for calculate profile and plan curvature

[Carlos "Guâno" Grohmann]

Here are some images of it:

www.igc.usp.br/pessoais/guano/tempo/srtm.krig.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.krig.aspect.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.krig.slope.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.krig.profile.curv.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.krig.tangent.curv.jpg

www.igc.usp.br/pessoais/guano/tempo/srtm.rst.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.rst.aspect.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.rst.slope.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.rst.profile.curv.jpg
www.igc.usp.br/pessoais/guano/tempo/srtm.rst.tangent.curv.jpg


Carlos


On 3/8/06, Carlos Guâno Grohmann <carlos.grohmann at gmail.com> wrote:
> Hello all.
>
> I have just resampled a SRTM DEM using krigging (in R) and did the
> same with RST. The maps are very similar. When I resampled
> (interpolated) the DEM with RST, I can choose to derive maps for plan
> and tangencial curvature (among others) at the same time, and so I
> did.
> For the map interpolated with krigging, I have to derive curvatures
> using r.slope.aspect.
> While the DEMs are very similar, derivative maps don't. Curvature maps
> calculated with r.slope.aspect have lots of artifacts, while those
> from rst are much more smooth.
>
> So, I want to ask how I can calculate these curvatures in another way
> (r.mapcalc?)? I'd like to use the same method over both DEMs.
>
> thanks
>
> Carlos
>
>
> --
> +-----------------------------------------------------------+
>               Carlos Henrique Grohmann - Guano
>   Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
> Linux User #89721  - carlos dot grohmann at gmail dot com
> +-----------------------------------------------------------+
> _________________
> "Good morning, doctors. I have taken the liberty of removing Windows
> 95 from my hard drive."
> --The winning entry in a "What were HAL's first words" contest judged
> by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
>


--
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke