Scanning railways

Please post any tips or advice you have in general relating to laser scanning either whilst onsite or office based.

Re: Scanning railways

Postby MalteHC » Tue Sep 09, 2014 7:06 am

Jennifer L. wrote:Hi,
3DReshaper Application has a plugin which allows to write Scripts in order to run automatic processing and also to write your own process.
A Script extracting automatically the railways from point clouds has been written with 3DReshaper for a French company working for French railroad.
http://www.3dreshaper.com/en1/En_script.htm
Unfortunately, it is not possible to find more "public" information on the internet. So if you are interested, please contact us and we will be able to show you a demo of a basic script extracting rails. We can't give you the code itself, of course.
Jennifer

Hi Jenifer

That would be perfect. How can i get in contact with you?
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Re: Scanning railways

Postby MalteHC » Tue Sep 09, 2014 7:12 am

Keep in mind that this is a university project, so i have to do it all theoretical.
The idea is to put a scanner with build in GNSS, on a trolly driven by a train. so the data itself should be good. I haven't actually done the data collection yet, because it is a theoretical project i am working on. But i have started to write the guidelines for the script (which is the most important part of this:) ).
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Re: Scanning railways

Postby Jennifer L. » Tue Sep 09, 2014 8:30 am

Great! Send me a mail at: jennifer.ludwig@hexagonmetrology.com
And we will set an online demo.
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Re: Scanning railways

Postby MalteHC » Thu Sep 11, 2014 12:11 pm

danielgadowski wrote:Hi there,
i'll throw my two cents here as a person who actually works on track.
1. I would aproach such project with a trolley kinematic scanning system in mind (Amberg GRP5000).
2. The trolley would measure your track, the scanner would pick up your balast.
3. Extract profiles from your data set. These will have the track rinning edhes on them plus a profile through the scan.
4. Use the known offsets from your running edges to get your "sleepers base surface".
5. Use the profiles to create the second surface
6. Calculate the volume.
I hope this helps.
Daniel


Thanks daniel, this is some of the same thoughts i had myself. But for the acamedic purpose i will try to see if i can use this method on a mobile scanner, which can move faster :)
MalteHC
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Re: Scanning railways

Postby danielgadowski » Mon Sep 22, 2014 9:25 am

[quote="MalteHC
Thanks daniel, this is some of the same thoughts i had myself. But for the acamedic purpose i will try to see if i can use this method on a mobile scanner, which can move faster :)[/quote]
Malte,
it's not only down to the speed of scanning, but you are also picking up the rails alignment and your "base surface" information at the same time.
Good luck with your project.
Daniel
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Re: Scanning railways

Postby Jennifer L. » Tue Sep 23, 2014 11:25 am

Hi all,
As I have been talking about it, here is a video showing rails extraction thanks to a script in 3DReshaper:
http://www.youtube.com/watch?v=o80RfNKOLrY
At the begining the script is launched and the user just has to click a first point approximately on the rail. Then points are automatically computed on top of the rail through the whole point cloud. As the script moves forward the points are chained together to create 3D polylines.
This video shows a demo script and could maybe give some ideas to some of you.
Jennifer
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Re: Scanning railways

Postby abdiman » Tue Mar 15, 2016 11:30 am

Jennifer L. wrote:Great! Send me a mail at: jennifer.ludwig@hexagonmetrology.com
And we will set an online demo.



Dear Jennifer,

is it possible that you can also send me that script?
i`m a student Geomatics in the Netherlands, and doing a research about automatic extraction of pointclouds to polylines. I am also using 3DReshaper and i wanna try this script on my research.

greetings,

Abdirahman Arraye
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Re: Scanning railways

Postby Jennifer L. » Wed Mar 16, 2016 12:05 pm

Hello Abdirahman,
Can you send me a mail so that I've got your email address?
Jennifer L.
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Re: Scanning railways

Postby sakul007 » Tue Mar 21, 2017 11:42 am

Jennifer L. wrote:Hello Abdirahman,
Can you send me a mail so that I've got your email address?


Hello, I know it's old topic but can you guys share script with me. I am playing around with some point clouds and try to figure out what are the possibilities. Thank you in advance :)
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Re: Scanning railways

Postby Jennifer L. » Wed Apr 05, 2017 9:16 am

Hello,
We do not share this script for free. You can send me some sample data so that I can run the script and test it. I'll send you the resulting polylines so that you can see if it is what you were expecting.
Jennifer
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