topic Re: Is Classification of Point Cloud possible in C3D? in Civil 3D Forum

Is Classification of Point Cloud possible in C3D?

tesfaye_kebede — Thu, 26 Mar 2020 09:49:36 GMT

Hi,

I have a point cloud file (*.las) not classified (filtered).

Is there a method to make the classification in ReCap or in C3D? I tried but not possible in my test!

Do you have any suggestion for an Autodesk or free download application to make unclassified scan data (las) to classify it (create filter like Ground, Building, etc.?

Regards

Tesfaye Kebede

Trimble Civil Engineering and Construction

Re: Is Classification of Point Cloud possible in C3D?

Pointdump — Thu, 26 Mar 2020 10:01:01 GMT

Tesfaye,
I highly recommend the free >>>LAStools<<<.
Please post your LAS file. If the zipped size is over 75MB, then you can use Autodesk Drive, WeTransfer, or DropBox, etc.
Dave

Re: Is Classification of Point Cloud possible in C3D?

rl_jackson — Thu, 26 Mar 2020 11:53:39 GMT

With the current workflow Autodesk is promoting, the classification is done in Infraworks prior to import to C3D.

The workflow goes Recap - Infraworks - C3D.

Download Dotsoft Lidar Tools from the appstore and you'll get the classification functions back.

Re: Is Classification of Point Cloud possible in C3D?

TerryDotson — Thu, 26 Mar 2020 12:15:42 GMT

The question is what logic would one classify by?

Here is an approach to consider. We have a way of accessing approximate elevations based on DEMs pretty much across the globe. If a person had unclassified lidar (on a known system) it seems reasonable that software could compare the lidar point elevation to the grid cell and potentially separate existing ground (class 2) from the rest. That of course would assume no significant disturbance has taken place.

Re: Is Classification of Point Cloud possible in C3D?

tesfaye_kebede — Thu, 26 Mar 2020 12:44:14 GMT

Customer has no Infraworks only Recap and C3D.

Re: Is Classification of Point Cloud possible in C3D?

tesfaye_kebede — Thu, 26 Mar 2020 13:04:45 GMT

How do you create a surface in C3D with unclassified point cloud and export as DEM?

And DEM export function works well in the US country kit.

In Norwegian kit not possible to set the Correct CRS. See the attached Image.

Re: Is Classification of Point Cloud possible in C3D?

TerryDotson — Thu, 26 Mar 2020 14:56:41 GMT

Sorry I was talking theory (thinking out loud) in my previous post.

Your best choice today is the LasGround tool in the LasTools posted by PointDump above (#2).

Re: Is Classification of Point Cloud possible in C3D?

lynn_zhang — Tue, 31 Mar 2020 03:35:19 GMT

Hello @tesfaye_kebede ,

Just checking to see if your problem has been solved. Did the above response from Terry help answer your question? Let us know if you still need help.