Survey point and project base point

[jfountain]

I have several Revit projects that were started at various times over the last several years.  Unfortunately these were all started at random locations in the coordinate system with no regard to a common base point or grid system.  Is there a way I can specify a point in each Revit model that will coincide with AutoCADs 0,0 point when I export from Revit?  I want to be able to export all of these Revit models to .dwg and have them all align correctly when I reference them into autocad.  And of course have them align correctly when linking into other Revit models.  Hopefully this makes sense.  Essentially I want to specify a point in Revit to be Autocads 0,0 when I export.

Thanks for any help.

[virgilio_benedictos]

@jfountain

you have to understand the difference between Project basepoint and Survey Basepoint.

Survey basepoint serve as the origin of the survey or the (0,0,0) origin in AutoCAD system coordinate.

Project basepoint serve as the origin of the project and Project Base point has equivalent value in a Survey Base point.

When you linked CAD in a project its better you have to set it properly. 

ex.

1.  In Autocad you have to determine your project basepoint of your project (your project layout shall be in the right coordinates) . it should free on unnecessary element that very far on your layout. 

2. got to the Site view, that Project base point and Survey base point are visible and in the same location.

3. Linked CAD and use positioning Auto center to center.

4. Then move and place your Linked CAD proposed project Basepoint (autocad) to project basepoint(revit). your project basepoint in your CAD file are now aligned to your project basepoint in Revit.

5.for you to able to get the right coordinates base in autocad go to Manage tab > Project Location Panel > Coordinates > Aquire coordinates. then select the Linked CAD. then publish coordinates.

so the next time that you will linking another CAD file use Positioning Auto Shared Coordinates.

hope this will help you,.

regards,

VER