Solved: LAS point cloud import; how do I convert XY from degrees to feet?

Anonymous · ‎07-22-2015

I'm trying to bring in a .las file into Civil 3D, but it's not coming in correctly. The coordinate system of the file is WGS84. I set the projection in my drawing file to match, but when I bring in the point cloud, it seems to read the degrees of the XY maximum and minimum as feet. I cannot find where to fix this.

AllenJessup · ‎07-23-2015

Do you have a small LAS file you could share. That way we could experiment with it.

Allen

Allen Jessup
CAD Manager - Designer
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Anonymous · ‎07-23-2015

Hello Allen,

The smallest one I have is 251 MB. I'm not sure what the file size limit is here.

AllenJessup · ‎07-23-2015

Yeah. That's too big and I can't access Dropbox or anything like that. Does it happen to be public source? Is there somewhere I can download it?

Allen

Allen Jessup
CAD Manager - Designer
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Anonymous · ‎07-23-2015

I should have thought of that. Link:

https://www.dropbox.com/s/5wwxf40t7ufep5i/150409_NVPSite_points.zip?dl=0

You can download directly from the link without Dropbox.

AllenJessup · ‎07-23-2015

Unfortunately I can't. I'm blocked from anything that has Dropbox.com. Hopefully someone else will give it a try.

Allen

Allen Jessup
CAD Manager - Designer
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Anonymous · ‎07-23-2015

Thanks anyway!

gccdaemon · ‎07-23-2015

Have you tried setting the drawing units to metric? Just an idea. I can do point clouds, but don't know much about WGS location.

Andrew Ingram
Civil 3D x64 2019
Win 10 x64 Pro
Intel Xeon E5-1620
32 GB Ram

Anonymous · ‎07-23-2015

I tried that, along with changing the drawing coordinate system. The problem is that it seems to be interpreting the lat/longs as linear coordinates, so what should be about 48 acres comes in as .0061 ft. .0061 m wouldn't be any better.

gccdaemon · ‎07-23-2015

I think I know what you're talking about now. I have had the same problem with FEMA data. I think you'll have to use ARCGIS or some other GIS software to translate it into state plane coordinates. I wound up having our survey dept fix it...lol.

Andrew Ingram
Civil 3D x64 2019
Win 10 x64 Pro
Intel Xeon E5-1620
32 GB Ram

Anonymous · ‎07-23-2015

Maybe I can talk my boss into getting Spatial Analyst. ET vtools doesn't import las files.

AllenJessup · ‎07-23-2015

It looks like the LAS2LAS.exe from https://www.cs.unc.edu/~isenburg/lastools/ might do it. But it doesn't look too user friendly.

Allen

Allen Jessup
CAD Manager - Designer
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Anonymous · ‎07-24-2015

Boy, am I ever stoopid. The answer is right there in the dialog box when I import the point cloud. Set the drawing coordinate system for what it needs to be, then set the cloud coordinates for what they are, in this case WGS84 LL, then let the computer do the work.

gccdaemon · ‎07-24-2015

Glad you got it figgured out. Don't forget to mark it as an answer!

Andrew Ingram
Civil 3D x64 2019
Win 10 x64 Pro
Intel Xeon E5-1620
32 GB Ram

LAS point cloud import; how do I convert XY from degrees to feet?

LAS point cloud import; how do I convert XY from degrees to feet?

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