This kind of videos are quite misleading, modern scanners like RTC do colour scans in 2-3 min and usually colours are not used so it's more like 1-2 mins per scan. It would take less than 1 hour.GeorgSchroth wrote: ↑Tue Dec 01, 2020 9:34 am Shane and Dennis from LSF but for sure many many others outside the LSF have already done extensive accuracy evaluations of the VLX (thank you for that). But not everyone had the chance to compare the VLX scans against a ground truth scan.
As you know building a reliable ground truth is not a quick scan, and the team working on this project realized that as well:
To get a reference, we first scanned a hallway at NavVis with a TLS (that many of us own) and used cloud to cloud registration. However, the resulting point cloud showed clear artifacts from incorrect registrations.
So we decided to go an get the most precise scanner out there (afaik) and used a total station to precisely position the scans with respect to each other (which took us a full day overall together with a trusted surveying customer of ours)
The result of the comparison is pretty good I would say Actually a lot better than the VLX accuracy spec. This is not too surprising since we made and will continue to add quite a few enhancements to our algorithms & software. So all the devices out there are getting better and better with every release.
But have a look for yourself and let me know what you think or would need in addition (point clouds can be downloaded here https://navv.is/2HS4LM0 )
youtu.be/dzCFEkd9GzQ
In many cases surveying control point network can be the most difficult part of work, sometimes even crew of 2-3 is needed. I guess with mobile scanners you need to pay even more attention to control points as drift can occur and digital imu perfomance doesn't match compensator (noticed on RTC). Having precise elevation is usually required at least on our indoor projects, so P40 would win this comparison
For floor area calculations we have some standards in Finland and mobile scanners don't exceed those requirements.
VLX is still a great product, specially for topographic surveys or fast scans on renovation projects.