Line marking / Road marking from Point Cloud

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WillieM
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Line marking / Road marking from Point Cloud

Post by WillieM » Fri Apr 04, 2014 1:09 pm

Good afternoon!
I have used a C10 indoors for a while now, but the project I work at is moving to a new stage. I did several scans of the area surrounding our building and I would like to speed up the identification of the road/line marking.
I started selecting points of the cloud along the line, converting them to vertexes and exporting them to cad. But, is there any faster way to do it? Or even better, is there any way to identify the lines automatically?
Thanks a lot for your time!

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Re: Line marking / Road marking from Point Cloud

Post by WillieM » Fri Apr 04, 2014 1:11 pm

I forgot to mention. I use Cyclone 8 and Autocad 2009. Just in case it helps.

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Re: Line marking / Road marking from Point Cloud

Post by jcoco3 » Fri Apr 04, 2014 1:29 pm

Hi William,

There are a handful of tools out there to extract features from roadway, but I don't know of any for AutoCAD 2009. Maybe somebody else will have more information for you. My personal favorite is Bentley Descartes. The 3D line following tool can semi automatically create lines for the road stripping. It uses the intensity contrast between the pavement and stripes with some hints from you to find and extract them. We have used it on many projects and once you set it up right it works like magic. You have to get it started on each line, but then it anticipates and automatically extracts the rest of the line! To make the tool work properly with terrestrial scans I have found that it helps to homogenize the density of the point cloud through spatial filters.

youtu.be/

Hope this helps :)

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Re: Line marking / Road marking from Point Cloud

Post by WillieM » Fri Apr 04, 2014 5:14 pm

jcoco3,
Thanks for the tip. I will have a look to the software.
Do you think the process would work as well forthe joints on the concrete floor? I attached a couple of pictures were you can see both the line marks and the joints in the concrete. The joints were wet when the scan was done and that is the reason for such a clear contrast against the grey concrete. Normally they are seen just as a dark line 25 mm wide.
The joints are 10 mm deeper than the surrounding concrete (as average).
Thanks
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Re: Line marking / Road marking from Point Cloud

Post by bwx100 » Fri Apr 04, 2014 7:32 pm

WillieM wrote: I started selecting points of the cloud along the line, converting them to vertexes and exporting them to cad. But, is there any faster way to do it? Or even better, is there any way to identify the lines automatically?
Thanks a lot for your time!
Willie,

There are lots of ways to do this in Cyclone and/or CloudWorx. One of the simplest approaches is to either draw polylines in Cyclone and export as DXF or draw line/polylines in AutoCAD using CloudWorx. If my post works correctly, here is a movie that David Langley made for us (thanks Dave), that shows both methods.


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Re: Line marking / Road marking from Point Cloud

Post by bwx100 » Fri Apr 04, 2014 7:33 pm

OK, my posting skills suck. Here is a link to the movie

http://scansw.leica-geosystems.com/publ ... nework.mp4

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Re: Line marking / Road marking from Point Cloud

Post by Chris T » Fri Apr 04, 2014 8:26 pm

If you do the process in Cyclone you can customize shortcuts so you dont have to use the drop downs all the time as well. We use CloudWorx and fly thru striping. Cyclone II Topo is also a Leica product that can find striping as well I believe.

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Re: Line marking / Road marking from Point Cloud

Post by jcoco3 » Fri Apr 04, 2014 8:44 pm

William,

I don't think those joints would be a problem for the 3D line follow tool. You just need to tweak the high/low intensity setting. If all else fails and the joints are fairly straight you could always just draw a straight line above them then use the "drape line" tool, but I would try the 3D line follow first.

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Re: Line marking / Road marking from Point Cloud

Post by colhum1 » Fri Apr 04, 2014 9:19 pm

Hi William,

Pre scanning days, we always produced RTC scenes as 2D plans for Courts, Coroner and the like.
This has been great for the past decade or so but in the past 2 years we were introduced to laser scanning.
3D point clouds are extremely useful, detailed and I don't mind saying some are beautiful to look at.

However, the outside world hasn't caught up to the progress we've made and time and time again we get ' can I have a plan please' :?

I use LSS Elite and Bentley Powerdraft with our Topcon kit and Cyclone with the C10.

I don't have access to any 'automatic' processes......

The quickest way for me to convert scan data to a line plan is to use Cyclone.

I open the layers box, create a new layer calling it 'kerb' or similar, set as current, give it a colour.
Return to the screen and using 'multi-pick' tool, select my kerb or whatever.
Hit ctrl+P.
Repeat this time add another new layer, label it accordingly etc and set that as current and repeat the process until youre finished.

When your done return to the layers dialogue box and turn off everything apart from your newly created layers.
At this point I turn the cloud on and off...checking I've got all the bits I need.

Export as dxf and import into your cad package...as I said for me that's LSS or Bentley, where I apply my own line Legend.

Sounds long winded but it is really quick in practice.

I do have this as a PDF document with screen grabs that I can forward if interested.

Colin
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Re: Line marking / Road marking from Point Cloud

Post by johnhalifax » Sat Apr 05, 2014 12:20 pm

Hi William,
We use TOPODOT, the best thing I have ever seen for point cloud to CAD, great for road makings. You can get a 30 day trial and the guys at Certainty 3D will get you up and running, one to one tuition you won't regret it.
Image

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