[GRASS-user] face to DEM?

[Vincent Bain]

Hello Adam,
hope I understood what you mean to do. If I had to cope with your
problem, I would import the source file as points, then run v.to.rast,
and r.surf.nnbathy with the "l" interpolation method.
The risk for this solution is the triangulation performed by
r.surf.nnbathy be different from your source TIN...

Good luck,
Vincent.

Le samedi 14 février 2009 à 16:42 -0800, Adam Dershowitz a écrit :
> I have some 3-d vector faces.  They were defined in a text file like  
> this:
> F 10
> 1 2 1
> 2 2 2
> ...
> ...
> etc.
> 
> I imported them into grass like this:
> v.in.ascii -zn input=faces.txt out=faces format=standard
> and all seems fine.
> 
> I can see the faces, and if I click on points around the edges I can  
> get a height as well.
> I can't figure out how to generate a raster DEM from these faces.   
> Essentially I would like to know the approximate elevation at each  
> raster point inside the faces.
> I tried v.to.rast but then I get "Column parameter missing"
> For v.to.rast3 I get  "Unable to get layer info for vector map"
> I also tried v.extrude but I see all 0s (ie Number of areas: 0 etc.)
> 
> Did I do something wrong on my import?  Did I miss some other way to  
> do the conversion?
> I want to be able to do some mapcalcs with the heights of an these  
> faces compared to another raster map, but I can't figure out how to  
> convert these faces to something that I can work with.
> 
> Thanks much,
> 
> --Adam
> 
> 
> 
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