Scanning railways

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

Post by MalteHC »

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

Post by MalteHC »

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

Post by Jennifer L. »

Great! Send me a mail at: [email protected]
And we will set an online demo.
Jennifer
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Re: Scanning railways

Post by MalteHC »

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 :)
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danielgadowski
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Re: Scanning railways

Post by danielgadowski »

[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

Post by Jennifer L. »

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

Post by abdiman »

Jennifer L. wrote:Great! Send me a mail at: [email protected]
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
Jennifer L.
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Re: Scanning railways

Post by Jennifer L. »

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

Post by sakul007 »

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 :)
regards

Lukas
Jennifer L.
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Re: Scanning railways

Post by Jennifer L. »

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
Jennifer
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