[GRASS-user] DTM/DEM to TIN

[Vaclav Petras]

On Fri, Dec 5, 2014 at 6:01 AM, G. Allegri <giohappy at gmail.com> wrote:

> As far as I can see GRASS doesn't provide any ready-to-go tool to generate
> TINs from grid digital elevation models. I know I can transform a grid to a
> regular mesh somehow (probably using the Triangle lib for the last step)
> but I can't find tools to generate TINs, given a certain amount of
> tolerance, which preserve significative locations (like those obtained by
> TPI for example) and shapes (in a morphonetric sense).
>
> Does anybody has experience on this? The general aim is generating terrain
> meshes (to be further decimated for LODs) to be employed in a 3D context.
>
I'm not sure if this would fulfill your requirements but I would use
v.delaunay [1]. To get the points, you can use v.random [2, 3] or some more
clever method.

Vaclav

[1] http://grass.osgeo.org/grass70/manuals/v.delaunay.html
[2]
http://courses.ncsu.edu/mea582/common/GIS_anal_grass/GIS_Anal_grinterp1.html
[3] http://grass.osgeo.org/grass70/manuals/v.random.html


> Cheers,
> giovanni
>
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