Hi Ulli:

 

I would try converting the contour lines to points first, then generating a 
DEM.  We use this workflow from time to time when we do not have a high quality 
DEM to work with.  

 

Kirk

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Ulrich 
Kriechbaum
Sent: Thursday, November 08, 2018 7:10 AM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Creating DEM from Contour lines

 

Hello all!

 

I investigate a Glacial Lake Outburst Flood which eroded a lot of material. 
What i try to do is to backcalculate the event with the simulation tool 
r.avaflow. For my simulations i need a Pre-Event DEM. I have a Post-Event DEM 
where the eroded trench is clearly visible. So what i did was to project the 
Contour lines of the Post-DEM, change them so that the trench is "flattened". 
Now i try to generate a Pre-Event DEM with these Contour lines. That's the 
point at which i am struugling. I tried to interpolate the Contour lines (TIN 
and IDW) but the results were not really satisfying.

 

Does anyone have an idea how to get a nice DEM from contour lines?

 

Best regards,

 

Ulli

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