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Smoothing Lidar Data
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Rachael Hay



Joined: 23 Apr 2013
Posts: 2

Western Australia, Australia

PostPosted: Tue 23 Apr, 2013 2:05 pm    Post subject: Smoothing Lidar Data Reply with quote

Hi there,
Just wondering if there's a process for smoothing contours in 12d. I have tiles of data in .xyz format that i'm importing into 12d. Have tried the vertex filter to weed out points but am still not getting nice smooth contours. Am looking for another way to do it. Thanks,

Rachael Hay
Proteus EPCM Engineers
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Scott McKinnon



Joined: 17 Dec 2008
Posts: 286

New South Wales, Australia

PostPosted: Tue 23 Apr, 2013 2:09 pm    Post subject: Reply with quote

I gather you're creating contours via TIN - Contours - Coutour, Smooth & Label?

First tab in the dialogue box ('Contours') there's a 'smooth' box to flag.
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Rachael Hay



Joined: 23 Apr 2013
Posts: 2

Western Australia, Australia

PostPosted: Tue 23 Apr, 2013 2:21 pm    Post subject: Reply with quote

yeah i have this checked but hasn't made a real difference. There may not be another way to do this but wanted to check if anyone knew.
Thanks
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Ed Wilson



Joined: 11 Oct 2005
Posts: 1675

New South Wales, Australia

PostPosted: Wed 15 May, 2013 1:05 pm    Post subject: Reply with quote

I think that contour smooth ticbox did nothing much on lidar data becuase the numberr of points (trias) is massive so mathematically doing some averaging over many points close together doesnt do much.

Using v10 I expect (well think) that one of the grid tin options would do what you want
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Owen Thornton



Joined: 04 Oct 2005
Posts: 4081

Queensland, Australia

PostPosted: Wed 15 May, 2013 3:55 pm    Post subject: Reply with quote

The smooth tick-box works by creating data (extra vertices on the contour strings), whereas I think Rachael is looking to smooth by removing noise from the source data.

As Ed has already said, the Grid Tin could well offer a good solution here, as (if I recall correctly) it samples the data around each grid point.

Edit: I appear to have recalled incorrectly. The grid tin does not currently sample the data around each grid point.
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louren cohen



Joined: 05 Mar 2014
Posts: 1

Western Australia, United States of America

PostPosted: Wed 05 Mar, 2014 7:27 pm    Post subject: Reply with quote

I am also confused how we can smooth the contours in 12d. I am a new user here and just learning things. Can any of you guys share me a link to get the manual; I guess a manual can make things easier.




Thanks
LOURENE
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Matthew Monk



Joined: 21 Oct 2005
Posts: 1883

Victoria, Australia

PostPosted: Thu 06 Mar, 2014 4:55 am    Post subject: Reply with quote

You can get the basic training manuals from the 12d website- http://12d.com/aus/resource_portal/learning_tools/v10-documentation/

You can also find some videos on the Youtube channel:

The official 12d channel:
http://www.youtube.com/user/12dModelSoftware

A channel by a 12d distributor, EXDS:
http://www.youtube.com/user/12dTrainer

Although, none of those actually cover the smoothing of contours. For V10, you can create a grid tin upon import or create a grid of points (Tins->Utilities->Grid DTM) as previously mentioned.
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david owens



Joined: 21 Oct 2005
Posts: 96

Queensland, Australia

PostPosted: Tue 11 Mar, 2014 3:11 pm    Post subject: Reply with quote

Hi everyone,
Where i work at Brisbane City Council we have a macro that filters the noise out of Lidar data and dramatically reducing the size of the finished tin while at the same time keeping the integrity of the data as much as possible.

The side effect is that contours produced from the filtered data are a good bit smoother than what you will get out of raw lidar data.

We are happy to email a copy of it if anyone is interested
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Matthew Monk



Joined: 21 Oct 2005
Posts: 1883

Victoria, Australia

PostPosted: Tue 11 Mar, 2014 11:36 pm    Post subject: Reply with quote

David- does your macro do anything different to the grid points/grid tin options available when importing?
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david owens



Joined: 21 Oct 2005
Posts: 96

Queensland, Australia

PostPosted: Wed 12 Mar, 2014 9:13 am    Post subject: Reply with quote

it sure is different
the way it works is that it drapes strings over the original lidar tin
then filters them
you then make a tin out of the filtered data
the filter tolerance and sampling rates are user definable but the defaults generally work well
i can email it to you or whoever else wants it

we checked the results by doing tin to tin volume calcs
then comparing the volume to the area of the tin

i am getting differences less than 0.1% and when you consider that lidar data is generally less accurate than that in the first place.....
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Glenn Allen



Joined: 11 Oct 2005
Posts: 2

Northern Territory, Australia

PostPosted: Thu 22 May, 2014 12:18 pm    Post subject: Reply with quote

Hi David, I'd certainly be interested in your macro if you are able to provide a copy. I've tried filtering the input data by z to drop out points that are within say 0.05m of a set interval, but haven't had success.
cheers,
Glenn
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david owens



Joined: 21 Oct 2005
Posts: 96

Queensland, Australia

PostPosted: Fri 23 May, 2014 9:15 am    Post subject: Reply with quote

no worries
can i get your email address?
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Glenn Allen



Joined: 11 Oct 2005
Posts: 2

Northern Territory, Australia

PostPosted: Fri 23 May, 2014 10:35 am    Post subject: Reply with quote

Thanks for the reply David, I have emailed you my contact details.
cheers,
Glenn
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Marc Jaspers



Joined: 02 Apr 2013
Posts: 11

New Zealand

PostPosted: Mon 04 May, 2015 10:52 am    Post subject: Reply with quote

thanks for the heads up on the Tin Grid command, fixed a little problems pretty well
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Alexander Todd



Joined: 21 Oct 2005
Posts: 108

New Zealand

PostPosted: Wed 16 Nov, 2016 8:09 am    Post subject: Reply with quote

Hi, is the offer of this Lidar filtering macro still available?

We have a few drone survey point clouds that i would be good to smooth out the contours from a presentation point of view?

Alternatively are there any new options in 12d V12 that i am not aware of yet?

Cheers
Alex
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