Geolocated cad file with point cloud

[robertovalentino]

Good morning,,
I was hoping you could help me out with a small problem that I have.

My client sent me a point cloud file, and a DWG file, a file with the point cloud linked in. 
Now, the DWG file is geolocated but the point cloud is not. 
is there a way to link the point cloud in Revit in the exact position after acquiring the coordinate system from the dwg file?

thank you in advance

Roberto

[barthbradley]

Georeferenced? Use this method first to bring the DWG into Revit:  

https://knowledge.autodesk.com/support/revit/learn/caas/CloudHelp/cloudhelp/2021/ENU/Revit-Model/fil...

Then Link the PC by Auto-Shared Coordinates.  That should work.    

[barthbradley]

Actually, I don't think it will work in this case.    I would definitely Link the DWG into Revit via Specify Coordinates at Point though.   

[robertovalentino]

Hi @barthbradley 
Thank you so much for taking the time to investigate it; I really appreciate it.
Unfortunately, the Point cloud is not georeferenced. Therefore any "link with shared coordinates" would put it in the wrong place.

I think I found the way, even though I do not like it that much.
On the CAD file, which has global coordinates (WGS84), I can select the point cloud, and I can see the coordinates (distance of the PC origin from the Autocad file Origin).
Now I link the DWG and acquire the coordinates.
Then I link the Point Cloud with "shared coordinates."

This will bring the point cloud to the wrong spot, of course, but I know how to move it because I have the coordinates (distance from the survey point).

Any comments?
Thank you!!!

[barthbradley]

Like I said before, I would bring the Geolocated DWG into Revit via Specify Coordinates at Point - not by positioning the DWG in Revit and Acquiring Coordinates.  

...the workflow is described in the link I provided above. 

[robertovalentino]

Yup I saw that 

but if I specify the coordinates I have the numbers but not the coordinate system 😉

[barthbradley]

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@robertovalentino wrote:

Yup I saw that 

but if I specify the coordinates I have the numbers but not the coordinate system 😉

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Huh? What does this mean?  "I have the numbers but not the coordinate system" 

[barthbradley]

Can you share what you were given by the client?  

[ToanDN]

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@robertovalentino wrote:

On the CAD file, which has global coordinates (WGS84), I can select the point cloud, and I can see the coordinates (distance of the PC origin from the Autocad file Origin).

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- Insert the PC in the geo CAD file

- Draw a Cross1 at the point cloud origin in AutoCAD

- Move the PC to align with CAD and copy the Cross1 with it to create Cross2, save

- Link the Geo CAD in Revit center to center

- Link the PC in Revit center to center

- Move the PC in Revit from Cross1 to Cross 2

- Acquire coordinates from CAD

[robertovalentino]

@barthbradley 

Oh sorry, I realise that was a built vague. Let me elaborate a little bit.

Using “coordinates at point” I can set the position of the survey point but I can not set the name of the coordinate system. It is just an XYZ point. If you interrogate revit about that, you will see:
Coordinate system = Unknown

I am used to set the coordinate system correctly in Civil3D (in this case UTM33 North - WGS84), and push it in Revit when I acquire coordinates.
Using Acquire Coordinates you will see the coordinate system used in the properties.

[robertovalentino]

😞
Unfortunately I can not share any file

[barthbradley · Accepted solution]

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@robertovalentino wrote:

@barthbradley 

Oh sorry, I realise that was a built vague. Let me elaborate a little bit.

Using “coordinates at point” I can set the position of the survey point but I can not set the name of the coordinate system. It is just an XYZ point. If you interrogate revit about that, you will see:
Coordinate system = Unknown

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That's because you didn't Link the DWG into Revit via Auto-Shared Coordinates afterwards. 

[robertovalentino]

Thank you so much @barthbradley 
That maks a lot of sense 😉