Underwater Laser Scanning

Discuss all Underwater Scanning related issues here.
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Formula1982
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Underwater Laser Scanning

Post by Formula1982 » Wed Nov 09, 2016 4:13 pm

When I noticed there weren't any topics in this section yet, I couldn't resist getting the first one in!

So for anyone who hasn't come across underwater scanning before, it's very impressive in terms of the speed of data capture, the accuracy of the data and the data clarity (especially compared to what it used to be, or sonar solutions).

A few images below of one of our projects scanning 10" pipework on the seabed. Get in touch if you'd like to know anything more.
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Re: Underwater Laser Scanning

Post by Matt Young » Wed Nov 09, 2016 4:33 pm

Having worked with some underwater data this year I can say that I was also very impressed with what can be achieved now. we worked on a project where the underwater data was joined with data we captured above the water. The accuracy was amazing!

I would love to tell more about the project, but it's really not my place to say.
matty@warnerlandsurveys.com
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Re: Underwater Laser Scanning

Post by Poux » Wed Nov 09, 2016 5:49 pm

Looks awesome !

Talking about accuracy, what can you expect from your experience for a well conducted underwater project (precision per point, noise, range, ...) ? Do you georeference such point clouds or work locally ?

First time I see such examples, very very nice !
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Re: Underwater Laser Scanning

Post by Formula1982 » Wed Nov 09, 2016 6:02 pm

Matt Young wrote:Having worked with some underwater data this year I can say that I was also very impressed with what can be achieved now. we worked on a project where the underwater data was joined with data we captured above the water. The accuracy was amazing!

I would love to tell more about the project, but it's really not my place to say.
Matt,
The work you've done is sonar based isn't it? Some good sonar based systems out there. We've done a few small test projects on canals and damns where we were joining terrestrial scanning data with the underwater scans, it's a great application.

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Re: Underwater Laser Scanning

Post by Formula1982 » Wed Nov 09, 2016 6:07 pm

Poux wrote:Looks awesome !

Talking about accuracy, what can you expect from your experience for a well conducted underwater project (precision per point, noise, range, ...) ? Do you georeference such point clouds or work locally ?

First time I see such examples, very very nice !
As you'd expect, the water is a more challenging environment to work in than air. Both logistically, physically conducting the survey, but also technically. The accuracy is affected by the water itself - clarity and particulates in the water in particular can cause an issue and reduce the clarity of the final data. Range is dependent on the water clarity too. If it's fast moving currents, you have to consider the stability of your scanning deployment method. For most projects we would be working locally, but in some cases georeferencing is necessary. There are a couple of different methods of achieving this, depending on the survey location (and water depth).

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Re: Underwater Laser Scanning

Post by JDicken » Thu Nov 10, 2016 11:29 am

It looks really nice.

I would be interested to learn more on this topic. Such as what equipment is out there etc. I imagine it can't come cheap? :lol:

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Re: Underwater Laser Scanning

Post by Backface » Thu Nov 10, 2016 12:42 pm

Hi Guys

Also a field im interested in though have not had any experience in it, thought this article might interest you if you have not seen it already.
http://lidarnews.com/press-releases/wor ... -printing/

Regards
Jason

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Re: Underwater Laser Scanning

Post by savante » Thu Mar 23, 2017 12:08 am

Hello, afraid I have not been particularly active on this forum, but my company Savante has been performing subsea and underwater laser metrology (scanning, making 3D models in general) since 2003/2004 and we've been using it in much the same way as the construction and forensic world. 3D scenes, point clouds and then onto measurements really.

I thought I would just say my hello but importantly put to present a link to our website at www.savante.co.uk

I would of course be delighted if you'd visit, perhaps subscribe to our newsletter and hopefully we can share some of our knowledge. In short, laser scanning works well underwater; although you need to plan your scans to accommodate the absorptive and scattering properties of water.

If I can, I have some really interesting case studies which I'd like to post, but if you would like to know more and can't get enough info from the site (still evolving), I pretty much blog on a daily basis on Linkedin. I'm a member of the laser scanning forum linkedin page- hunt me down from there !!!

Best Regards,

Grant Thomson, Managing Founder / Foundering Manager @ Savante Subsea

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Re: Underwater Laser Scanning

Post by Nadalchukwu » Thu Mar 23, 2017 8:27 am

savante wrote:Hello, afraid I have not been particularly active on this forum, but my company Savante has been performing subsea and underwater laser metrology (scanning, making 3D models in general) since 2003/2004 and we've been using it in much the same way as the construction and forensic world. 3D scenes, point clouds and then onto measurements really.

I thought I would just say my hello but importantly put to present a link to our website at http://www.savante.co.uk

I would of course be delighted if you'd visit, perhaps subscribe to our newsletter and hopefully we can share some of our knowledge. In short, laser scanning works well underwater; although you need to plan your scans to accommodate the absorptive and scattering properties of water.

If I can, I have some really interesting case studies which I'd like to post, but if you would like to know more and can't get enough info from the site (still evolving), I pretty much blog on a daily basis on Linkedin. I'm a member of the laser scanning forum linkedin page- hunt me down from there !!!

Best Regards,

Grant Thomson, Managing Founder / Foundering Manager @ Savante Subsea
hunting you immediately

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Re: Underwater Laser Scanning

Post by tomcard » Fri Mar 24, 2017 2:32 pm

Hi,

Very interesting stuff, we've done a lot of underwater scanning sonar but not laser yet. Is there any issue with water clarity? I would imagine that reasonable visibility is required. Also, do you use scanning sonar to provide the overall location of items, as per the last image?

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