[GRASS-user] DEM generation with v.surf.rst and isolines

[M S]

I found this link from the GRASS wiki to be quite helpful.

http://skagit.meas.ncsu.edu/~helena/grasswork/interpgen.html


Mark

On Thu, Feb 26, 2009 at 9:52 AM, Christian Braun
<christian.braun at tudor.lu>wrote:

> Dear list members,
>
> I am currently working on the generation of a hydrologic correct DEM.
> As base data I have isolines on a 20k scale and 60000 fix height points for
> whole Luxembourg (approx. 2500km^2)
> I tried first v.surf.rst with the isoline input and it generates in the
> region of valleys and plateaus artificial artifacts where it isn't able to
> gather enough data in range of the isolines. It is clearly visible that
> these represent the segmentation windows of the algorythm.
> Because of the processing time (>20h for a small area) I shifted to
> v.to.points in combination with v.surf.rst and try to include also the fix
> height points for the interpolation.
> Can you tell me some suitable parameters to start with for v.surf.rst in
> context of using isolines as input. In areas with higher slope I have plenty
> of representation but I don't have data in flat areas like valleys and
> plateaus.
>
> Thanks in advance and greetings from Luxembourg,
> Christian
>
> ------------------------------------------------------------
> Dipl. Geogr. Christian Braun
> Tel: +352- 425991-608
> Mobil: +49-179-6845896
> Mail: christian.braun at tudor.lu
>
> Resource Centre for Environmental Technologies,
> Public Research Centre Henri Tudor,
> Technoport Schlassgoart,
> 66 rue de Luxembourg,
> P.O. BOX 144,
> L-4002 Esch-sur-Alzette, Luxembourg
>
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