software to work(registration) with a large number of scans

3DVEM, Leica Cyclone Register 360, FARO Scene, LFM Suite, Autodesk ReCAP, Riegl RiScan Pro, Trimble RealWorks, Etc.
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bialekwojtek
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software to work(registration) with a large number of scans

Post by bialekwojtek »

Hello
Our company will work with very big project to scanning half of city center:) We using Faro Facus 120s and 330 and usually Faro Scene software (sometimes also Ascan software). In this case i think Scene will not help us (It will be about 1,500-2000 scans)
So which software you choose to work with a large number of scans?
Leica Cyclone will do it right?
Also we need to make it with geodetic coordinate system and with good accuracy.
If someone have experience with this kind of project it would be great.
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Matt Young
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Re: software to work(registration) with a large number of sc

Post by Matt Young »

Cyclone will do it alright, but you would still want to keep individual registrations to 100 to 150 scans each.

As for the geodetic coordinate system - you may want to consider breaking your data into blocks. As soon as you start bringing curved earth into the equation you will be seeing errors across your scan registrations, due to the short distances involved in the scanning.
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Re: software to work(registration) with a large number of sc

Post by Simon Judd »

Scene will also cope very well.

We have 5 Faro scanners (X330 HDR) and our projects regularly have in excess of 1000 scans.

Our largest is nearly 3000, all registered successfully in Scene.

SImon
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Re: software to work(registration) with a large number of sc

Post by bialekwojtek »

Thanks for response,
Simon,
We just got upgrade of Scene to 6.2, before this we used 5.2 so in that versions it is imposible for sure. In this kind of large project, what precision do you get?
Matt,
So Cyclone can register several individual blocks of scans to the geodetic point? From experience can you tell me what precision we can get between two blocks? Unfortunately earth is not flat:)
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Re: software to work(registration) with a large number of sc

Post by Matt Young »

No, the Earth is not flat, but imagine that laser scanning thinks it is. Registering scans over large distances and attaching them to an adjusted control network will give rise to errors. I can't tell you what those errors will be I'm afraid.
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Re: software to work(registration) with a large number of sc

Post by bialekwojtek »

Yes I know this problem what laser nad software thinks, it was just wishful thinking:)
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Re: software to work(registration) with a large number of sc

Post by cfoster »

bialekwojtek wrote:Thanks for response,
Simon,
We just got upgrade of Scene to 6.2, before this we used 5.2 so in that versions it is imposible for sure. In this kind of large project, what precision do you get?
Matt,
So Cyclone can register several individual blocks of scans to the geodetic point? From experience can you tell me what precision we can get between two blocks? Unfortunately earth is not flat:)
I registered 1800 scans in 5.2. Needless to say there were some hiccups, but it worked just fine.
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Re: software to work(registration) with a large number of sc

Post by richard_m »

In my personal experience Cyclone handles big regs far better than Scene but I've no experience of the latest Scene versions.

I've done several hundred scans in a single Reg but to be honest it was regretted and driven only by scope-creep. I have a practical limit of 500 scans/Reg.

The traditional scalefactor adjustment for curved-earth systems doesn't really bear thinking about for scanning. By all means use a total station (with 1.0 scale) from survey control (that has 0.99xx scale) to measure targets in an area and register the scans for such areas serarately. As long as these areas are not too big then the few millimeters of scale factor error will be lost in the overall comibined reg when you fit these sub-regs together and the overall site will fit relatively well to your scaled system. Check your given specs beforehand and document you intend to do this to avoid fallout after delivery.

Personally I'd much rather agree an overall site system with 1.0 scale and try hard to talk sense into Clients. Its easy when you say things like "you're aware that if I model a 500m pipe system in your proposed scaled data and dimension it for replacement/fabrication then the length will be too short? Probably."

Good luck

Richard
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Re: software to work(registration) with a large number of sc

Post by Simon Judd »

We have been registering large scanning projects in Scene since version 4.

Each version has successfully handled large data sets and generally any hiccups are due to mis-management in the field rather than the software.

As already discussed, keeping the clusters to manageable sizes and good geometrical coverage in terms of your artificial reference objects is paramount in keeping control of the registration.

Conventional Survey control is also also an essential part of our workflow allowing us to check overall registration fit and is always scale factor 1.0 for the reasons that others have described.

Think of clusters as mini projects all adding to the overall solution.

In theory Clustering correctly and good quality control checks should allow any number of scans to be registered with Processing power being the weak link.

Simon
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Re: software to work(registration) with a large number of sc

Post by Matt Young »

I still don't know why we don't have a like button on this website :)
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