[GRASS-user] DTM/DEM to TIN

[G. Allegri]

I've just discoevered r.refine, which seems to do exactly what I need ;)
https://github.com/jontodd/r.refine

giovanni

2014-12-05 16:21 GMT+01:00 G. Allegri <giohappy at gmail.com>:

> 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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>>> grass-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>>
>>
>>
>
>
> --
> Giovanni Allegri
> http://about.me/giovanniallegri
> Twitter: https://twitter.com/_giohappy_
> blog: http://blog.spaziogis.it
> GEO+ geomatica in Italia http://bit.ly/GEOplus
>



-- 
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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