Just musing, KML doesn’t really give you anything other than the walls? Therefore it doesn’t really matter if you use the base point for the 3D scan data and trace around the walls to whatever detail you want. Using the 3D scan data as a background image on your th2 file.
As far as I know the KML only really gives you plan data, perhaps a negligible amount of vertical data, but I’ve never really played about with it. I’ve been able to create KML by using one or two points of a .3D file in a mile (or half a mile) of passage. The introduction of less points just increases the warping of the walls. It just depends on what accuracy you want, 3D scan will give you pinpoint accuracy, how you use that is up to you. I hope you get on well with the introduction of 3D scan data :) See you soon Nick! Al. Sent from my iPhone > On 20 Jun 2019, at 20:30, kevin dixon <geospatia...@gmail.com> wrote: > > 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 > <therion@speleo.sk> 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 <geospatia...@gmail.com>: >>> >>> 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 >>> <therion@speleo.sk> 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 <her...@speleodd.sk>: >>>> >>>>> This software should do it: >>>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgeoslam.com%2Fhub%2F&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213530576&sdata=xAonwt7nb%2BlKTnV25024kZpGe0bAk2dGxC6o2%2B0S%2BNc%3D&reserved=0 >>>>> 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 <geospatia...@gmail.com>: >>>>>>> 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 <n...@pff.uk.com> 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 >>>>>>>> Therion@speleo.sk >>>>>>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213530576&sdata=K0fFnL9GqnBx%2FxkNJ5RaZyucLvu0Tqp8fMSoUgtzXGU%3D&reserved=0 >>>>>>> _______________________________________________ >>>>>>> Therion mailing list >>>>>>> Therion@speleo.sk >>>>>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213530576&sdata=K0fFnL9GqnBx%2FxkNJ5RaZyucLvu0Tqp8fMSoUgtzXGU%3D&reserved=0 >>>>>> _______________________________________________ >>>>>> Therion mailing list >>>>>> Therion@speleo.sk >>>>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213530576&sdata=K0fFnL9GqnBx%2FxkNJ5RaZyucLvu0Tqp8fMSoUgtzXGU%3D&reserved=0 >>>>> _______________________________________________ >>>>> Therion mailing list >>>>> Therion@speleo.sk >>>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213540575&sdata=N0El%2FsIWaCQ6Z5%2BuGS36ovSkVRIOuMpf326G5wPkkU8%3D&reserved=0 >>>> >>>> _______________________________________________ >>>> Therion mailing list >>>> Therion@speleo.sk >>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213540575&sdata=N0El%2FsIWaCQ6Z5%2BuGS36ovSkVRIOuMpf326G5wPkkU8%3D&reserved=0 >>> _______________________________________________ >>> Therion mailing list >>> Therion@speleo.sk >>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213540575&sdata=N0El%2FsIWaCQ6Z5%2BuGS36ovSkVRIOuMpf326G5wPkkU8%3D&reserved=0 >> >> _______________________________________________ >> Therion mailing list >> Therion@speleo.sk >> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213540575&sdata=N0El%2FsIWaCQ6Z5%2BuGS36ovSkVRIOuMpf326G5wPkkU8%3D&reserved=0 > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.speleo.sk%2Flistinfo%2Ftherion&data=02%7C01%7C%7C4a1bc8d4138e4cb217e308d6f5b5ba83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636966558213540575&sdata=N0El%2FsIWaCQ6Z5%2BuGS36ovSkVRIOuMpf326G5wPkkU8%3D&reserved=0 _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
