Posted Wed, 26 May 2021 07:30:15 GMT by Mr. Ben Weir
Hello Navvis family!

question about VLX capability.
how would the vlx cope being used under a marine structure, such as a wharf?

we are able to walk some of the underside (easy part) and some from a small boat, at slow walking pace, with suitable headroom from the vlx to underside structure (appx 2-3m)

I would imagine the vlx would have issues as the floor (boat) is static, while the ceiling (underside wharf) is "moving".
SLAM issues getting lost?

appreciate the help.

Posted Wed, 26 May 2021 14:57:24 GMT by Youlin Gao
Hi Ben,

thanks for using our forum to put up questions :)

I'm not too sure about the exact structure in your scenario, but yes, if in the environment, where the floor is static and the ceiling is "moving", then the SLAM and the accurate capturing of the structure will be suffered.

Could be that the scanning can still be finished and the result doesn't have a broken structure, but I guess the "moving" structures like the ceiling might be cloudy or inaccurate. It's similar to e.g. mapping a corridor with a constantly moving door, in the end the could be the corridor is still correctly scanned but the door is not a trustworthy object.

Hope it helped a bit,
Best, Youlin
Posted Wed, 02 Jun 2021 22:05:40 GMT by Mr. Ben Weir
Hi Youlin,
thanks for the prompt reply!
I have attached a small image of the wharf in question.

My question was around the slam coping with being in a boat, so technically the "boat floor mapped area" does not change (as we are static in the boat), but the ceiling above it does, as we move slowly underneath the wharf.

would the VLX "consider" itself static, in one position in the boat, and the mapped ceiling above us appear blurry like a revolving door? we would end up with a lovely scan of the boat floor area, and a blurry ceiling  / underside of wharf?

Many thanks

Posted Fri, 04 Jun 2021 07:26:56 GMT by Youlin Gao
Hi Ben, 

thanks for the screenshot and description, I think I understood better of your scenario.

My previous reply was imagining you were on a boat and floating up & down under a wharf but without moving around much -> boat floor could be scanned well but the "ceiling" would be blurry.

From your last mail I guess you're on a small boat but moving quite a lot under the wharf, if the main structure you're capturing is the wharf, then actually what we can imagine is the wharf is static (which is true) and the VLX/mapper/boat is moving.
In an ideal case you'll get a relatively good scanning of the wharf structure, but the boat captured by the VLX will be the noise and will be like a trailing pointclouds in the final result. Similar to e.g. if you're stretching your hands during an indoor scanning you'll get a trailing pointclouds of your hand.

Sounds like a quite challenging environment and let me know if I misunderstood anything of your scenario.

Best, Youlin

Posted Wed, 09 Jun 2021 04:42:47 GMT by Mr. Ben Weir
Thank you Youlin,
we can handle a noisy boat trailing point cloud, with a realtivley good scan of the wharf. this is still leaps and bounds ahead of anyhting else on the market, which is why we have a huge list of these to do.
Do you see a means to delete / hide sections of unwanted cloud in the indoor viewer in the future, or is this too complex a scenario.

Thank you mate

speak soon.

Posted Tue, 31 Aug 2021 13:21:31 GMT by Peter Pignataro
Hi Ben, 

I'm posting to request an update to your scenario. 

Did you carry out the scan from a boat - and if so how were the results? 

I curious because I've had similar scenarios a number of times with requests to scan from a hoist or boom lift but I've always declined because I assumed the lift itself would become the static object. It sounds like your scenario would be a great experiment. 

Posted Thu, 02 Sep 2021 23:43:39 GMT by Mr. Ben Weir
Hi peter,
we expect to have the new VLX in our hands by mid october.
I can assure you we will try to find the limits of this fabulous piece of equipment as fast as possible.
we have projects coming up for large diameter water pump shafts, bridges, wharfs, historic gardens (buried ancient cooking pits) archaelogy dig sites, buildings roof cavities, factroy sites, grain silos, power substation yards and buildings, power genration service tunnels, and the list goes on.

We will post as much of this via linkedin and facebook, so be sure to keep a look out. (
happy to share success and learnings as we go.

Stay well
Posted Fri, 03 Sep 2021 03:22:12 GMT by Youlin Gao
Hi Ben & Peter,

Great to know that there're more and more scenarios that you're interested and that VLX has the potential reach to all these difficult situations.

Just found that I missed the last question from Ben, about clearing noisy pointclouds. From IVION we can do such croping of desired range of pointclouds, but only to export them:

To clean desired area of pointclouds and present it as default in IVION is still not available, a workaround is to clean the pointcloud.ply in 3rd party software before web-processing, and after web-processing it would be a cleaned version. (Of course this local step needs desktop processing SW and not our cloud processing.)

Best, Youlin


You must be signed in to post in this forum.