<meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Hi,</div><div><br></div><div>I am not sure I understand but why not just use the ground points and the building points together in the same DEM?  Do you only have the ground classified points?  </div><div><br></div><div>Nicolas</div><div><br>Le 12 mai 2017 à 10:05, KevinKnoche [via <a href="http://OSGeo.org" target="_top" rel="nofollow" link="external">OSGeo.org</a>] <<a href="/user/SendEmail.jtp?type=node&node=5320362&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> a écrit :<br><br></div><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii">Hey there,

I'm currently working on a project concerning heavy rainfalls. What I'm supposed to do is an 2D numerical calculation of flooded area of a town. For this I have a special plugin for QGIS.

What this plugin needs is a precise DEM includes breaklines of buildings, walls etc.

I've already managed to build up a DEM from LIDAR Data including some breaklines with Z-Values.

What makes some trouble is the fact, that I only managed to include the breaklines for the buildings like a bowl so that they only have foundation walls and no roof. So if it would rain they will be filled up with water instead of contributing to the surface runoff.

Does somebody of you have an idea how to include roofs onto the breaklines? Plane ones would be precise enough.

<br><br>Thanks a lot :)

<br>Kevin

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