Kevin, is any of those softwares able to create vector outline of projection of cloud to a plane?
Martin > 20. 6. 2019 v 12:43, kevin dixon <[email protected]>: > > Those with their own LiDAR instrument will usually have access to > their LiDAR manufacturer Software and this often includes automated > rendering of man-made surfaces - results quality depend a lot on the > LiDAR resolution and accuracy. Natural surfaces such as caves are more > difficult for Point Cloud software to deal with automatically. > > For the rest of us, you may wish to consider the following open source > software for Point Clouds: > MeshLab - lots of functionality, poor interface, I used this a decade > ago when there were few open source options > CloudCompare - nice interface, I have not used it for a while > ParaView - uses PCL (Point Cloud Library), PCL can be used direct > depending on your coding ability > PDAL - a library of point cloud tools, need to use something like QGIS > for results visualisation > Blender - more for 3D videographics > 3DTK - 3D Toolkit, not familiar with > > Other options are available. > > Kevin Dixon > > On Thu, Jun 20, 2019 at 9:36 AM Martin Sluka via Therion > <[email protected]> wrote: >> >> Isn’t it as call for nuclear aircraft carrier to kill a fly? >> >> Martin >> >> Odesláno z iPhonu >> >> 20. 6. 2019 v 9:33, Pavel Herich <[email protected]>: >> >>> This software should do it: >>> https://geoslam.com/hub/ >>> P. >>> >>> >>> Dňa 2019-06-20 09:26 Martin Sluka via Therion napísal(a): >>>> I’m curios if there is a software able to create vector map outline >>>> from cloud data automatically. >>>> Martin >>>> Odesláno z iPhonu >>>> 19. 6. 2019 v 23:13, kevin dixon <[email protected]>: >>>>> Nick, >>>>> I have both DistoX2 and LiDAR data for parts of the same cave. >>>>> All the LiDAR scans were registered to create a single model as normal >>>>> for LiDAR. >>>>> The individual scans were then decimated in the Point Cloud Software >>>>> using a suitable distance to nearest neighbour. I found Survex gets a >>>>> bit overwhelmed with millions of LiDAR data so you may have to >>>>> experiment with a suitable distance between adjacent LiDAR data. Each >>>>> decimated individual scan was then output to LibreOffice Calc and new >>>>> ranges, bearings and inclinations calculated to create single station >>>>> Survex files with lots of splays, now all orientated the same way. >>>>> Dummy traverse observations were created within Survex to link all the >>>>> LiDAR scan stations based upon the Point Cloud registration >>>>> coordinates and elevations of the scan stations. >>>>> I then manually matched the Survex output of the above LiDAR data to >>>>> some known DistoX2 observations or in your case, perhaps known show >>>>> cave outline. You can do this within Survex by having your non-LiDAR >>>>> data as another survey then using a Calibrate Compass figure (may >>>>> require up to +/-180degrees) within the LiDAR Survex data to change >>>>> the orientation so as to match the known and also setting one of the >>>>> LiDAR stations within the Dummy traverse observations to coordinates >>>>> and elevation that give a good fit with the known data. Several >>>>> iterations are needed with these. >>>>> Hope that is self explanatory. >>>>> Has worked for me - I have a DistoX2 Survex model with very detailed >>>>> LiDAR data in two large chambers - the resulting LOG file looks a bit >>>>> weird eg. >>>>> 1 8659-node. >>>>> 1 19071-node. >>>>> 1 21844-node. >>>>> 1 22774-node. >>>>> 1 23053-node. >>>>> 1 24470-node. >>>>> 1 25278-node. >>>>> As a side note, part of my project includes a Show Cave and I have not >>>>> had a problem with insitu metalwork there or on scaffolded sections of >>>>> the cave. I have always kept the DistoX2 well away from metalwork and >>>>> when the passage is narrow with metalwork, I have used an intermediate >>>>> station with DistoX2 observations to it only, never from it. >>>>> I have considered the use of turned angles to get through a serious >>>>> metaliferous section - the Leica DST360 could do this for you or a >>>>> small theodolite - use magnetic obs at each end to orientate it all. >>>>> Kevin Dixon >>>>>> On Wed, Jun 19, 2019 at 9:02 PM Nick Bairstow <[email protected]> wrote: >>>>>> Hi, Something a bit different for the clever people out there. >>>>>> I have been playing with some 3d scan data and have attempted to use it >>>>>> to create a Therion map. >>>>>> Firstly we put created an outline of the cave passage using point cloud >>>>>> software and exported as dxf. >>>>>> I turned the dxf into a background sketch and drew around it and could >>>>>> output a nice pdf of our cave. Also did a manual scaling. So far so good. >>>>>> I added a dummy station and gave it entrance coordinates, then exported >>>>>> as a KML model. When I open the output file Google Earth fly’s to the >>>>>> correct spot and shows a pin with the cave name but no cave. >>>>>> My question is , does this fail because we have no survey data, >>>>>> centreline etc and it is impossible to do this or am I missing something. >>>>>> As an alternative I can export to an esri shp file and run that though >>>>>> Qgis and get what I want but as I am going to attempt to combine the 3 >>>>>> scan data with a several normal disto surveys I would like to see >>>>>> Therion Kml output work if possible to save lots of messing around. (GIS >>>>>> makes my head hurt) >>>>>> On a side note using the point cloud software I can slice though the >>>>>> scan data on different planes and pick up lots of detail, rocks and >>>>>> boulders etc. Using the dxf/background image method I should be able to >>>>>> get a very accurate representation of the passage. I can hear you all >>>>>> saying what the hell is he doing that for when he could just survey the >>>>>> cave in the normal way! Well the cave is a show cave and absolutely >>>>>> rammed with metal walkways and cables. Disto tests showed wild >>>>>> inaccuracy’s so it was looking like the only viable option was going to >>>>>> be to use a Total Station device which we don’t have. We then had a >>>>>> very kind offer to scan the cave, this has proved to be very interesting >>>>>> but drawing a normal map is a bit of a challenge although it seems not >>>>>> impossible. >>>>>> Any help would be appreciated. >>>>>> Nick >>>>>> _______________________________________________ >>>>>> Therion mailing list >>>>>> [email protected] >>>>>> https://mailman.speleo.sk/listinfo/therion >>>>> _______________________________________________ >>>>> Therion mailing list >>>>> [email protected] >>>>> https://mailman.speleo.sk/listinfo/therion >>>> _______________________________________________ >>>> Therion mailing list >>>> [email protected] >>>> https://mailman.speleo.sk/listinfo/therion >>> _______________________________________________ >>> Therion mailing list >>> [email protected] >>> https://mailman.speleo.sk/listinfo/therion >> >> _______________________________________________ >> Therion mailing list >> [email protected] >> https://mailman.speleo.sk/listinfo/therion > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion _______________________________________________ Therion mailing list [email protected] https://mailman.speleo.sk/listinfo/therion
