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 <[email protected]>: > > > On Fri, Dec 5, 2014 at 6:01 AM, G. Allegri <[email protected]> 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 >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> 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
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