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 <[email protected]>: > 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 > -- 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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