[GRASS-user] DEM generation with v.surf.rst and isolines
manuel.seeger at wur.nl
Thu Feb 26 10:48:46 EST 2009
I made some attempts with the attert basin, and I should have a look on
the itial parameters.
The big problem is that you need for different morphological areas also
some different parameters for the splines, so you will always have
problems when generating a DEM for all of Luxembourg.
(in Wageningen since 4 weeks!)
> -----Original Message-----
> From: grass-user-bounces at lists.osgeo.org
> [mailto:grass-user-bounces at lists.osgeo.org] On Behalf Of
> Christian Braun
> Sent: donderdag 26 februari 2009 15:53
> To: grass-user at lists.osgeo.org
> Subject: [GRASS-user] DEM generation with v.surf.rst and isolines
> 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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