Hi, If you want to see your TIN as raw data, without interpolation and conversion to gridded format, best to have it supported as a "mesh layer": https://docs.qgis.org/3.4/en/docs/user_manual/working_with_mesh/mesh_properties.html
To add support for it, you need to have it in MDAL: https://github.com/lutraconsulting/MDAL/ There are processing tools to convert it to regular vector or raster (at user-defined resolution), but you should be able to work with the native nodes/edges/surfaces directly from QGIS. Regards Saber On Fri, 4 Oct 2019 at 18:09, Falk Huettmann <fhuettm...@alaska.edu> wrote: > Hi, > I agree with Barend and Nicolas here. > > It's a typical and essential question that we get all the time, like, > can we re-grid and subsample pixels ? > =>You can, technically, but you stay just within the same data, > and thus, create nothing new or meaningful. > > In other words, it should not be done. > > There is a lot wrong with re-sampling, gridding, within DEMs, with merging > grids, > reprojecting and interpolation surfaces. And GIS techs are pretty guilty > of that, > so are their supervisors. > The tools we provide should point that out clearly and not allow for it. > > Key to those questions remain 'ethics', metadata of course (!) and then > always a comparison as a benchmark for > accuracy and to see the actual gain of such re-samplings. > > (but let's agree that TINs are only one way of getting a surface, often > not the best one, > when compared to the 'truth'. Playing around with them for best output is > not a bad idea) > > Very best > Falk Huettmann > > > > > On Fri, Oct 4, 2019 at 4:00 AM Nicolas Cadieux < > nicolas.cadi...@archeotec.ca> wrote: > >> Hi, >> >> You cannot invent new data between point without doing an interpolation. >> Your choice of interpolation will determine the quality of this data. The >> only way I can think of is to create a raster from this TIN. Then, >> resample (re-interpolated) this raster with a finer pixel and then make a >> new TIN. This may create a finer TIN but this will significantly alter the >> original data. You would need to evaluate the results and keep a backup of >> the old files. >> >> Alternative, I would try with Mesh Lab. It’s open source and probably >> has Mesh densification methods that would be more adapted. Cloud Compare >> also has interesting algorithms. >> Nicolas >> >> > Le 4 oct. 2019 à 03:40, joolek <joole...@gmail.com> a écrit : >> > >> > Hi Experts, >> > >> > I've tried so many software's without success. >> > Is it possible to upsample existing TIN? What I mean is for example >> divide each triangle into two for example. Not interpolation but somehow... >> subdivide or add more vertices between existing one? >> > Thank you for all your time >> > J >> > _______________________________________________ >> > Qgis-user mailing list >> > Qgis-user@lists.osgeo.org >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Saber Razmjooei www.lutraconsulting.co.uk +44 (0)7568 129733
_______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user