[Qgis-user] Manipulating DEM

[Nicolas Cadieux]

Hi,

This is where a little fill-in brush tool "À la Photoshop" would be 
nice.  On a more serious note, you could  isolate the area and use a 
flood model to fill it in. Then use raster math to stick it all back 
together.  Posting a picture of you problem could help.

Nicolas


On 2018-11-08 8:49 AM, Ulrich Kriechbaum wrote:
> Dear all!
> I investigate a Glacial-Lake Outburst Flood and try to back-calculate 
> the event using the simulation tool r.avaflow. During the event there 
> was a big trench eroded. I have a post-event DEM with a clearly 
> visible eroded trench. What i want to do now is to "flatten" out the 
> trench so that i get a pre-event DEM to start my simulation. What i 
> tried to do is to create the contour lines of the post-event DEM, 
> change them so that they would not show the trench and then create a 
> pre-event DEM out of this contour lines. I already asked the question, 
> if anyone knows how to do that, i already got some nice answers but 
> unfortunately none of the inputs really work for me....
> So now to my actual question: Does anyone know another method how to 
> "flatten" out the trench in the DEM? I would be really glad if someone 
> would have an answer, as i have ben struggling a while now with these 
> problem..
> Best regards,
> Ulli
>
>
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