[Qgis-user] Interpolation with breaklines

[Nicolas Cadieux]

Hi again, 
Are the irregular points LIDAR? If it is comparable in point density, you could do two interpolations. One for the ground that could use a larger interpolation search window and then one for the objects that are above the ground with a very small search window (like 1m). After that,  you could make a normalized DEM and then you can add the walls to the ground model..   That would give you sharp walls feature on a smooth ground DEM.  
The PDAL library or Cloud Compare could separate buildings from the ground. 
Good luck! 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Nov 20, 2015 5:47 AM, "Neumann, Andreas [via OSGeo.org]	" <ml-node+s1560n5237598h99 at n6.nabble.com> wrote: 

	
Hi, 
At my workplace we have to generate terrain models (contour lines) from irregularly input points with heights. We also have break lines (e.g. walls) that we would like to take into account during interpolation. 
While there are quite a few interpolation available in GRASS or SAGA, I can't find any interpolation methods that also take break lines. 
I found  http://grasswiki.osgeo.org/wiki/TIN_with_breaklines   - which seems to do what I want, but is a separate module and builds on a "triangle" executable and is not distributed with GRASS. 
I have therefore two questions: 
1. Is this the only FOSSGIS option we have, if breaklines should be considerered during interpolation? Or are there alternatives? 
2. Did someone use v.traingle. this in a production environment? Does it work properly? I am just asking before I try to install it. 
3. If this works fine - can we try to distribute it with OSGeo4W? 
Thanks, 
Andreas 
  

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