[Qgis-user] Interpolation with breaklines

[Alex Mandel]

On 11/20/2015 02:56 AM, Neumann, Andreas 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 

https://grass.osgeo.org/grass70/manuals/addons/v.surf.icw.html

"Inverse cost weighting is like inverse distance weighted (IDW)
interpolation, but uses cost instead of shortest Euclidean distance. In
this way solid barriers and molasses zones may be correctly taken into
account."


There may also be a way in R, or a more general method that could be
achieved with existing tools used in a slightly different way as
described here
http://gis.stackexchange.com/a/33678

-Alex