Elevator shaft scanning

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jcoco3
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Elevator shaft scanning

Post by jcoco3 » Sat Jan 06, 2018 3:26 am

It has been a very long week, and I think we have walked at least a vertical mile up and down stairs scanning from floor to floor in an attempt to scan some very tall (430 feet or so) evelator shafts. We have some previous experience with this odity, but this one is different.
https://laserscanningforum.com/forum/vi ... tor#p64342

I would not say we have perfected this method, but we were able to cover alot of ground scanning every few floors.
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We chose the funny sideways backwards facing position of the scanner to aid with cloud to cloud registration back to the elevator lobby scans, but we turn of the inclionmeter in registration on all the sideways scans and rely soley on the lobby scans for level. We do have a serious amount of survey control all over this building to help, but that is another story.

Now, the real fun began today, and it was a long Friday. Scan some elevator shafts that only open on the first and then again on the 18th and above...sure no problem! Pretty much a vertical tunnel 200' tall. It took some planning, but even with all our proactive head scratching we still had to go through 3 or 4 configurations and tuning before we were ready to send the scanner down the hole.
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The platform was surprising stable. We taped an inspection beam flashlight with a very circular profile to the rig and pointed it down-shaft so we could observe the edge of the beam ensuring there was no motion prior to scanning...a laser pointer would have been better, but most of this rig was built on the 18th floor in the cold dark with scraps, and a laser pointer was not in the treasure chest. Our success reminded me of a line in a movie I like, although I would not say we are at the Tony Stark level with our caveman scanning aparatus.

Bridges did his part:
https://youtu.be/9foB2z_OVHc

youtu.be/9foB2z_OVHc
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Re: Elevator shaft scanning

Post by jedfrechette » Sat Jan 06, 2018 6:43 am

*Like*
Jed

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Re: Elevator shaft scanning

Post by tsjerkdezwart » Sat Jan 06, 2018 2:46 pm

Amazing how you manage to find well working solutions for all kind of challanges Jonathan!
I've done some scanning with my X130 in stairways in same position as you did. I found some misallignment in the scans and thought this could be caused by tolerances in de rotating part of the scanner shaft drive. Did you experience a similar effect?

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Re: Elevator shaft scanning

Post by jcoco3 » Sat Jan 06, 2018 3:14 pm

Thanks Jed :D

Tsjerk,

I am not sure we have been able to isolate or separate any mechanical errors introduced from using the scanner sideways from the precarious bracketry used to get it into that position, but we assume there will be some seam overlap error in any case. My guess is that the errors we have experience are from vibrations and flexibility in the "platform" and not the scanner's axis of rotation, but I have no good way to sort this out.

Knowing there will be some error we planned to compensate for it by scanning with only about 30 foot separation between scans and supplementing the registration with lots of survey control. We also mount the scanner with the begining and end of the seam along the short distance to the side of the shafts and not top to bottom of the shaft (which would have a tendancy to magnify the seam error). Lastly we are distance base filtering the scans to about 100 feet.

Just to be clear, none of those efforts truely compensate for the error, it is more of an effort to make them more managable by directing the seam to areas of the scan that have less impact on the registration.

We know that we could run these scans through a newer version of Scene in an effort "massage" the error out through "angular compensation", but that can also be a bit of the same placebo if the error that occured was not an actual calibration issue, but was instead motion or tilting during the scan...not to mention the rest of this project is old and the upgrade process would waste too much time, so we will be stuck in 5.3 for the remainder of this project.

Just re-read what I just wrote...man this stuff is still so complicated and my explanation so simplified :?

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Re: Elevator shaft scanning

Post by Scott » Sat Jan 06, 2018 5:02 pm

jcoco3 wrote:
Sat Jan 06, 2018 3:14 pm
Just re-read what I just wrote...man this stuff is still so complicated and my explanation so simplified :?
Jonathan, thanks for this interesting post -it's a nice start to the New Year! You've got a nice 'box of parts' (and a brain to match) -Tony Stark would be proud. Well done!

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Re: Elevator shaft scanning

Post by jcoco3 » Sun Jan 07, 2018 12:30 am

Thanks for the nice words Scott.

I just hope that someday somebody else will find the information in this post when they need it and build something even better.

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Re: Elevator shaft scanning

Post by pbashiri » Sun Jan 07, 2018 12:52 am

We have built a custom made bracket to scan a vertical shaft.
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Re: Elevator shaft scanning

Post by bdawood » Sun Jan 07, 2018 6:51 am

I am wondering if the elevator is working, if it is the case, then can you set the scanner as normal inside the elevator and extend the scanner through the roof and scan at every floor level.

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Re: Elevator shaft scanning

Post by richard_m » Mon Jan 08, 2018 8:10 am

Wow.

Have to say, its refreshing to read a post from someone who knows what they're doing. For my money the critical part of this project was the survey control, for most readers that's going to be the witchcraft part - could you give any more information on how you approached that?

What was your objective for this scanning / deliverable? I've been asked to scan all sorts of things but never a lift shaft.

My mouse-hand was beginning to sweat as I look at some of those pictures of your scanner in that shaft.. :shock:

Thanks

RIchard.

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Re: Elevator shaft scanning

Post by tbwester » Mon Jan 08, 2018 3:32 pm

yall need a raise :D

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