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<p class="MsoNormal">Hi Ulli,</p>
<p class="MsoNormal">If the trench is narrow (in terms of pixels), you can run a smoothing filter over that part of the DEM. Then replace the original trench pixels with those from the smoothed DEM using a conditional statement (gdal_calc with a ‘where’ statement).</p>
<p class="MsoNormal">Regards, Rick</p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Qgis-user <qgis-user-bounces@lists.osgeo.org> on behalf of Ulrich Kriechbaum <ulrichkriechbaum@gmx.at><br>
<b>Sent:</b> Thursday, November 8, 2018 5:49:12 AM<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> [Qgis-user] Manipulating DEM</font>
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<div>Dear all!</div>
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<div>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....</div>
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<div>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..</div>
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<div>Best regards,</div>
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<div>Ulli</div>
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