[GRASS-user] DTM/DEM to TIN

[G. Allegri]

Thanks for the suggestions. I already had a look at that page, but nothing
seems to fulfill my requirements.
Using v.random is not a solution. I should select significative points, and
significative lines, to feed Triangle. Random selection will probably miss
important locations (e.g. peaks, etc.).

giovanni

2014-12-05 15:57 GMT+01:00 Vaclav Petras <wenzeslaus at gmail.com>:

>
>
> 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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>>
>
>


-- 
Giovanni Allegri
http://about.me/giovanniallegri
Twitter: https://twitter.com/_giohappy_
blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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