Tilt-Turn target questions

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shannig
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Tilt-Turn target questions

Post by shannig » Wed Sep 12, 2018 12:12 am

Hello all,

I am a land surveyor with some prior experience with a Faro X330 and Scene. In the past I've only done cloud-cloud registrations.

I'm planning to add scanning to the surveying services I'm offering. For the time being, I have access to a Faro X330. I will be using Register 360 to create the cloud, and C3D with Cloudworx to extract linework when needed. Since I will likely need to combine scan data with conventional survey data, scans will need to be georeferenced onto a local coordinate system. So I'll need targets.

I'm considering the Leica 4.5 or 6" black and white tilt/turn targets, but have a few questions. Targets are expensive and I want to buy them once.

1. I understand that Register 360 will correctly detect the B/W tilt/turn targets?
2. Will an X330 correctly scan the targets so that R360 can use them?
3. In the future, it's possible that I'll purchase my own Leica C-10 or P-series scanner for outdoor survey-quality work. Are the B/W targets the correct ones for targeting with these scanners? For traversing, etc?
4. Leica also has (had?) blue targets with a white dot. Are these interchangeable with the B/W targets? Specifically, will they work with the X330 and R360 workflow?

Thanks in advance for your help!

-Steve

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Matt Young
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Re: Tilt-Turn target questions

Post by Matt Young » Wed Sep 12, 2018 11:54 am

As far as I know, the tilt and turn B/W targets are ok with the Faro. Just take care with the distances your acquiring them at. At lower resolutions you won't want them too far away.
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Re: Tilt-Turn target questions

Post by Strider3D » Wed Sep 12, 2018 6:34 pm

You are better off with the black and white targets. The target poles with the Blue-Dot are specific to the C-10 and earlier models. I have successfully used black and white targets collected with the faro Focus 120 and M70 scanners in Register 360. Targets were autodetected on import. There is also a file that is installed with Leica Cyclone that you can print paper targets to use as intermediate targets. I think you would want at least 2 tilt and turn targets. The size difference determines the range at which they can be successfully detected.
P40 Black&amp;White target.pdf
HDS Black&amp;White target.pdf
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shannig
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Re: Tilt-Turn target questions

Post by shannig » Wed Sep 12, 2018 7:41 pm

Thanks for the info.

You're right, I could probably get away with two targets if my survey control is properly distributed throughout the project. 1-2 control points on each side of a building, for example. I do have access to a variety of spheres for registration purposes.

I'm leaning toward purchasing two 6" B/W targets. Do you know if the C10 will read the B/W targets, or will it only work with the blue dot targets?

Thanks!

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Re: Tilt-Turn target questions

Post by Strider3D » Thu Sep 13, 2018 2:18 am

The C-10 will work with the Black and White (actually the grey and white ones). If you are considering a C-10 purchase then get the tilt and turn grey and white for that unit. C-10 does not like the black color. The other scanners will read the grey and white, or you could take a look at the new Leica RTC360, this is an amazing unit that makes registration a breeze.

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Re: Tilt-Turn target questions

Post by Daniel Wujanz » Thu Sep 13, 2018 3:32 pm

Dear Steve,

just a general remark: Most manufacturers recommend to use targets of this size up to a certain reach, usually 50 - 70 metres. That leads to a rather odd situation since the reach of most scanners is a lot larger. If you would scan for instance an object that is 300 metres away while registering it by targets that are a lot closer, you'll most likely get extra-polative (leverage) effects.

Thus, it is recommended to use overlapping regions between adjacent point clouds such as ICP-algorithm(s) or geometric feature-based approaches (e.g. planes or 3D-lines) in this case in order to fully exploit the inherent redundancy.

Cheers

Daniel

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