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

[Christian Braun]

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