Hello all,
If y'all could help me clarify once and for all what exactly is the Project Base Point, Survey Point, and how these points coordinate with Civil 3D survey plan data, that would really help clear the confusion in my workflow.
Here is what I have experimented with so far:
1) I have a Civil3D CAD plan from a civil engineer. I have little experience with site surveying, but I checked his file and saw site survey points in it. Basically, he did not just draw random lines and then called it a site plan. He actually inputted civil site data and that data is embedded in the CAD file.
2) I want this Civil3D CAD plan and its civil site plan data to actually be referenced into Revit. Meaning, I just don't want to put this CAD site plan and call it good enough. I actually want the civil survey points reflect into Revit.
3) So what I did then was: I picked a survey point in the Civil3D CAD plan and took it's N/S and W/E values and then inputted those N/S and W/E values in Revit's Project Base Point, hoping that once I link the Civil3D CAD file into Revit, the survey point in the CAD file will graphically align with Revit's Project Base Point. However, this was not the case. The CAD file was way off. I used Origin-to-Origin by the way, assuming that Revit's true origin is also (0,0,0) as is with the Civil 3D CAD file.
4) So what I did then was: in the Civil3D CAD file, I drew a large circle and centered this circle at (0,0,0) - this is for reference once link it up to Revit again. In Revit, I still left the Project Base Point as it was previously, the coordinates still matching the N/S and W/E of the survey point I picked from the Civil3D file. To just see where the (0,0,0) circle I drew in the Civil3D CAD file would show up, I re-linked the Civil3D CAD file into the Revit model. This is where it get's really interesting.
5) The reference (0,0,0) circle I drew in the Civil3D CAD file centers exactly on the Project Base Point in Revit, which still has the N/E and W/E data of the site survey point I took from the Civil3D file. I then "re-originated" the Project Base Point to N/S = 0, W/E = 0. Lo and behold the linked Civil3D CAD file moved along with it. Meaning, the reference (0,0,0) circle from the linked Civil3D CAD file moved with the Project Base Point no matter which way I move the Project Base Point. In all this time, I have not touched Revit's Survey Point, the little triangle that also takes N/S and W/E data.
6) So I then took that little triangle Survey Point and inputted the survey point N/S and W/E info from before. I re-loaded the Civil3D CAD link. The result gave me such a relief: the little triangle Survey Point in Revit actually aligned with the survey point I picked in the Civil3D CAD plan file.
So, this leads me to my question: What the hell? Can someone clarify this whole thing for me? I know that Revit has a True origin, but what then is the Project Base Point? I think I understand the Survey Point, but could someone clarify the other points for me?
Thank you advance!
Gelöst! Gehe zur Lösung
Check our 2 following videos that might help you with the coordination system between AutoCAD and Revit:
Hi,
The (2) videos seem to be out of date or terminated. I could not view the videos.
Simply put, the survey base point is a reference to real world coordinates. This data can them be used for calculations that are based on where the building is in the world.
Project base point is an internal reference for multiple model coordination and/or orientation on sheets.
I did not notice that the videos were removed.
Please recheck the following videos:
This reply has been edited by the moderation team as the videos were no longer valid.
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