I do not know. I have in the past hand cranked a result by plotting LiDAR data 2D (whole dataset or sub-slices) and manually selecting outer points to create an outline or cross section but that was circa ten years ago.
An 'automated' approach will need some sort of fractal control - coastline length problem. Kevin On Thu, Jun 20, 2019 at 6:56 PM Martin Sluka via Therion <[email protected]> wrote: > > 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 _______________________________________________ Therion mailing list [email protected] https://mailman.speleo.sk/listinfo/therion
