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://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 <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://mailman.speleo.sk/listinfo/therion >>> _______________________________________________ >>> Therion mailing list >>> Therion@speleo.sk >>> https://mailman.speleo.sk/listinfo/therion >> _______________________________________________ >> Therion mailing list >> Therion@speleo.sk >> https://mailman.speleo.sk/listinfo/therion > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://mailman.speleo.sk/listinfo/therion _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
