Need help to scan a dam with a long distance

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Tony_NGUYEN
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Need help to scan a dam with a long distance

Post by Tony_NGUYEN »

Hi everyone,
I would like advices to scan a dam hydraulic that we can't approach to the dam so we have to scan from 600m with a Riegl V400i scanner. This is the fist type project that we have ever scanned so we don't know how to do it. What is the configuration of scan that we have to use (the resolution, the target type...) and how to reattach with coordinated system because we have to use the target in 100m from the scanner and there are a big difference of disance from the scanner to target and form the scanner to the dam? If you have any experience of this type of project, could you give me advices please?
Thanks you very much.
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Re: Need help to scan a dam with a long distance

Post by Ioannis »

I would think about photogrammetry with a PPK drone parallel with a Leica p50.
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Re: Need help to scan a dam with a long distance

Post by landmeterbeuckx »

Tony_NGUYEN wrote: Wed Aug 19, 2020 12:40 pm Hi everyone,
I would like advices to scan a dam hydraulic that we can't approach to the dam so we have to scan from 600m with a Riegl V400i scanner. This is the fist type project that we have ever scanned so we don't know how to do it. What is the configuration of scan that we have to use (the resolution, the target type...) and how to reattach with coordinated system because we have to use the target in 100m from the scanner and there are a big difference of disance from the scanner to target and form the scanner to the dam? If you have any experience of this type of project, could you give me advices please?
Thanks you very much.
Scan at 100kHZ with panorama 40 or 20. You can scan the targets with the detail tool and finescan then. Or use Prisms.

No need for something else, the vz400i is made for this.
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Tony_NGUYEN
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Re: Need help to scan a dam with a long distance

Post by Tony_NGUYEN »

landmeterbeuckx wrote: Wed Aug 19, 2020 1:24 pm
Tony_NGUYEN wrote: Wed Aug 19, 2020 12:40 pm Hi everyone,
I would like advices to scan a dam hydraulic that we can't approach to the dam so we have to scan from 600m with a Riegl V400i scanner. This is the fist type project that we have ever scanned so we don't know how to do it. What is the configuration of scan that we have to use (the resolution, the target type...) and how to reattach with coordinated system because we have to use the target in 100m from the scanner and there are a big difference of disance from the scanner to target and form the scanner to the dam? If you have any experience of this type of project, could you give me advices please?
Thanks you very much.
Scan at 100kHZ with panorama 40 or 20. You can scan the targets with the detail tool and finescan then. Or use Prisms.

No need for something else, the vz400i is made for this.
Thanks landmeterbeuckx but do you think that le big diffirence of the distance give a low accuracy for the result?
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Re: Need help to scan a dam with a long distance

Post by landmeterbeuckx »

These scanners are designed for these kind of measurements. Accuracy will not ne a problem.
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Tony_NGUYEN
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Re: Need help to scan a dam with a long distance

Post by Tony_NGUYEN »

Thanks alot for your answers landmeterbeuckx
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Re: Need help to scan a dam with a long distance

Post by melshy »

If you need model from pointcloud pm me.
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Re: Need help to scan a dam with a long distance

Post by ananda »

Just want to toss this in here for anyone who wants to perform some monitoring scans:
Effective monitoring range = 1/2 max spec range

This holds true for every instrument I've used, and is a great rule of thumb.
The max range specified by a mfgr is not within the precision spec of said instrument. There is a scalar of error, and it is usually in relation to the beam divergence and optics of the instrument.

The result, is that you want to have a system that is spec'd for at least 2x as far as the monitoring distance.
The optimum scanner for your 600m range would be a VZ-2000i.

The 400i could work, depending on the requirements of the project, and how large your sample sizes are...

If I had to pick one scanner for all things monitoring, it would be the VZ-4000.
The precision of that instrument at range is amazing.
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Re: Need help to scan a dam with a long distance

Post by smacl »

Another instrument to consider for monitoring would be the P50 used in conjunction with a control network of known stations for instrument position and orientation established by total station. I've also seen the MS60 used to great effect for monitoring though it is possibly too slow for a structure of this size. Also worth considering for monitoring is whether the position on which your instrument has been setup is a position that can potentially change over time which needs to be accounted for in the measure. Surveying a braced network of control points with a good total station, which includes control external to the structure under investigation, is going to be very useful here regardless of the scanner you end up using.
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