<div dir="ltr">Thanks for the suggestions. I already had a look at that page, but nothing seems to fulfill my requirements.<div>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.).</div><div><br></div><div>giovanni</div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-12-05 15:57 GMT+01:00 Vaclav Petras <span dir="ltr"><<a href="mailto:wenzeslaus@gmail.com" target="_blank">wenzeslaus@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Fri, Dec 5, 2014 at 6:01 AM, G. Allegri <span dir="ltr"><<a href="mailto:giohappy@gmail.com" target="_blank">giohappy@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p dir="ltr">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).</p>
<p dir="ltr">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.</p></blockquote></span><div>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.<br><br></div><div>Vaclav<br></div><div><br>[1] <a href="http://grass.osgeo.org/grass70/manuals/v.delaunay.html" target="_blank">http://grass.osgeo.org/grass70/manuals/v.delaunay.html</a><br>[2] <a href="http://courses.ncsu.edu/mea582/common/GIS_anal_grass/GIS_Anal_grinterp1.html" target="_blank">http://courses.ncsu.edu/mea582/common/GIS_anal_grass/GIS_Anal_grinterp1.html</a><br>[3] <a href="http://grass.osgeo.org/grass70/manuals/v.random.html" target="_blank">http://grass.osgeo.org/grass70/manuals/v.random.html</a><br> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<p dir="ltr">Cheers,<br>
giovanni</p><span class="">
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Giovanni Allegri<br><a href="http://about.me/giovanniallegri" target="_blank">http://about.me/giovanniallegri</a><div>Twitter: <a href="https://twitter.com/_giohappy_" target="_blank">https://twitter.com/_giohappy_</a></div><div>blog: <a href="http://blog.spaziogis.it" target="_blank">http://blog.spaziogis.it</a><br>GEO+ geomatica in Italia <a href="http://bit.ly/GEOplus" target="_blank">http://bit.ly/GEOplus</a></div></div></div>
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