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Thanks for the detailed instructions. Initially, I tried with a huge point cloud scene but it was getting difficult to visualize so then I sampled a small subset out of it. The subset is having a valley sort of and hence it was expected to produce steep triangles. All the experimental results are in the attached zip file. The experiments were done for Release 0.3.3 <https://github.com/phma/perfecttin/releases/tag/0.3.3>, 0.3.6 <https://github.com/phma/perfecttin/releases/tag/0.3.6> and 0.4.0rc1 (master). As mentioned, the spikes are visible in 0.3.3 but it gets pretty smooth and smaller in 0.3.6 and 0.4.0rc1. Please check it. I have also added some screenshots for visual comparison. Not sure about the attachment size on the mailing list, so the results can also be accessed here <https://drive.google.com/drive/folders/1D9fAAooisQCO5BH_Ir12pyLe84Cqmy0z?usp=sharing> . I hope of not missing out on anything. Please let me know if I did. I would love to see Dr Steer's reply; he is really point cloud heavy and I have been following his articles lately. :) Kind regards, Rajat On Sat, Apr 18, 2020 at 3:37 PM Rajat Shinde <rajatshinde2...@gmail.com> wrote: > Thanks for the detailed instructions. > Initially, I tried with a huge point cloud scene but it was getting > difficult to visualize so then I sampled a small subset out of it. The > subset is having a valley sort of and hence it was expected to produce > steep triangles. All the experimental results are in the attached zip file. > The experiments were done for Release 0.3.3 > <https://github.com/phma/perfecttin/releases/tag/0.3.3>, 0.3.6 > <https://github.com/phma/perfecttin/releases/tag/0.3.6> and 0.4.0rc1 > (master). > > As mentioned, the spikes are visible in 0.3.3 but it gets pretty smooth > and smaller in 0.3.6 and 0.4.0rc1. Please check it. I have also added some > screenshots for visual comparison. > > Not sure about the attachment size on the mailing list, so the results can > also be accessed here > <https://drive.google.com/drive/folders/1D9fAAooisQCO5BH_Ir12pyLe84Cqmy0z?usp=sharing> > . > > I hope of not missing out on anything. Please let me know if I did. > I would love to see Dr Steer's reply; he is really point cloud heavy and I > have been following his articles lately. :) > > Kind regards, > Rajat > > On Sat, Apr 18, 2020 at 1:57 AM Pierre Abbat <p...@bezitopo.org> wrote: > >> On Friday, April 17, 2020 2:57:13 PM EDT Rajat Shinde wrote: >> > Hi Pierre, >> > >> > I would be very happy to do it. My PhD thesis involves LiDAR Point Cloud >> > processing and these days I am fully covered up with LAS/LAZ files. >> Though, >> > I have not used PerfectTIN till now, but I can see the earlier releases >> > available at https://github.com/OSGeo/perfecttin/releases. >> > >> > Please suggest me on how to proceed. >> >> Thanks! Here are the steps: >> >> Clone the repo (the latest commit should be on 2020-04-07 or later). >> >> Check out 0.3.3 and run it on some point clouds, looking for some where >> the >> TIN has big spikes (most likely in holes). >> >> Check out later commits and run them on the same clouds. The spikes >> should >> become smaller in horizontal area (they may be less than a millimeter >> thick) >> and then disappear. Thin spikes may appear in places they weren't before >> (I've >> seen them in falsely rough asphalt that is an artifact of photogrammetric >> processing of pine needle shadows), but should disappear by the latest >> commit. >> >> Also, would you like to contribute a translation? >> >> Pierre >> -- >> gau do li'i co'e kei do >> >> >> >> _______________________________________________ >> Discuss mailing list >> Discuss@lists.osgeo.org >> https://lists.osgeo.org/mailman/listinfo/discuss > >
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