Building Facade

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MagicBrou
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Building Facade

Post by MagicBrou » Fri Jun 08, 2018 12:26 pm

Hello,

i wánt to scan a building facade with faro focus 3D, But the Building is retty high (30-40m).

Can you give me any advice how to Scan it properly? What Resolution should i choose? i cant set the Tripod High enough :/

Thanks

jaredmatthews
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Re: Building Facade

Post by jaredmatthews » Fri Jun 08, 2018 12:34 pm

Hi MagicBrou.

Ideally you would want to get as little angle as possible, so if possible of you could scan it from the rooftop or through open windows from neighbouring buildings that would be the best.

If you are scanning from the ground you will be missing a lot of the data from the top of the building because of the angle.

In terms of resolution, you could use the standard "Outdoor 20m..." preset (deselect colour if you don't need it)
If you are setup in a good location that won't be disturbed for awhile, you could use 1/1 resolution and 2x quality. This will make your scan time around 35minutes.

The resolution will give you spacing of about 1.5mm over 10 meters, so you would be looming at about 4.5mm to 6mm over 30-40meters.

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MagicBrou
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Re: Building Facade

Post by MagicBrou » Wed Jun 13, 2018 8:31 am

thank you very much,

would you recommend to register the scans with cloud to cloud or with Targets? Because its very time consuming to put all the Targets on the facade.

i could also use sphere targets on the ground, but i dont know if the accuracy is good enough.

jaredmatthews
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Re: Building Facade

Post by jaredmatthews » Wed Jun 13, 2018 2:15 pm

I would say C2C should be fine with such high resolution. I tend to stay away from using targets as they have the risk of being moved (either by the public, or by wind). The only time I would use targets is checkerboard targets to setup control also using a total station.

Spheres have a good accuracy if they aren't scanned too far away, but I don't use them because they are prone to being moved or wobble in strong enough winds.

Which software are you thinking of using to register this with?

If you are going to use Realworks, I can help you no problem.

MagicBrou
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Re: Building Facade

Post by MagicBrou » Wed Jun 13, 2018 3:27 pm

We use PointCab for registration, but i could also use Faro Scene. Pointcab offers no C2C thats the bad thing but the adjustment algorithm is much better then any software.

would you recommend using 1/1 Resolution with 1x Quality ? Scan duration would be 18minutes then. And how far would you go between the scans for a good overlapping?

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pbashiri
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Re: Building Facade

Post by pbashiri » Wed Jun 13, 2018 5:31 pm

You need to set back from the building as far as possible to minimize the angle and be able to get as much as you can. A vantage point from neighbor buildings or even an elevated tripod is useful. you can use either c2c or targets for registration.
I have done the same thing quite a lot. pm me if you need assistance.

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jaredmatthews
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Re: Building Facade

Post by jaredmatthews » Wed Jun 13, 2018 7:10 pm

And how far would you go between the scans for a good overlapping?
How big is the facade?
If you could give me the address I could look at it on google maps and give you better direction of how many scans and where to place them :-)

If you can't post the address here, PM me.
If you can't give me the address, then maybe a screenshot of the facade.
would you recommend using 1/1 Resolution with 1x Quality ? Scan duration would be 18minutes then.
Again, it depends on what you need the data for and how accurate and clear you need the data.

Resolution is basically the amount of point in a given area. i.e the spaceing between points. Its the same principle as with screen display resolution or printing on paper using DPI (dots per Inch).

The greater the resolution, the closer the points will be to each other.

Quality is basically the accuracy or "confidence of measurement" of each point.

So as an illustrative example, a quality of 1x will mean that each laser point will be measured once and that will be the recorded measurement.
The higher you go up in quality, the more measurements per point will be taken, and a more accurate "averaging" will be take between all those measurements of that point.

The trick is to find the balance between speed on site and quality of measurements.

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