fine registration in rocky terrain

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hstmp
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fine registration in rocky terrain

Post by hstmp »

Hello,
I've found myself a solution for aligning scans in very rocky terrain/caves and I want to check that I'm not wasting my time.

Software: CloudCompare

Problem: very rocky terrain and angular surfaces so a lot of occlusion so very limited overlap for auto registration.
Manual registration is a bore and not quite tight enough.
Adding targets isn't always an option either.

I'm starting with the CloudCompare recommendations for using the ICP, and manually chopping out the core overlap areas, but cos it's soo varied it's still
http://www.cloudcompare.org/doc/wiki/in ... m_lucky.29

not brilliant.
So then...

I'm doing a cloud to cloud comparison and clipping the SF and using the weight in the ICP to favour those bits of the 'data' cloud in the alignment.

Is this sensible? or a waste of time?

I could take more scans for more overlap, but I really don't want the data burden if I can avoid it.

Many thanks.
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Re: fine registration in rocky terrain

Post by stevenramsey »

Which scanner are you using.
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Re: fine registration in rocky terrain

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Re: fine registration in rocky terrain

Post by davegrrr »

Hey George - I'd love to know how you get on with Vercator - you can register your scans automatically.

Here's a link to a free trial, or we can offer an unlimited version if you prefer - we just need your computers MAC address: https://vercator.com/

Shout if you need any help :-)

Regards,
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Vercator software - fast, automatic point cloud registration • vercator.com
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hstmp
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Re: fine registration in rocky terrain

Post by hstmp »

Thanks for the replies, only just seen them!

Using a BLK360. Delightfully light and manoeuvrable which is great for what we need but... well, lets just say it's good I don't have any hair to be pulling out
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Re: fine registration in rocky terrain

Post by MajorDomo »

Caves are very suitable candidates for C2C, just get huge amounts of overlap if you can. an old cave trick is to leave a lantern on the last scanner position to see what you have in common, while placing the scanner on the next station.

Why are you not using Cyclone for that, it should be a breeze (ok, less than a breeze with
a BLK).

As for the CC methodology, it is a valid approach, but you are bound to find BLK related issues, the BLK needs to be paired with a total-station for decent results.
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