After the online map data has been set and the coordinate system chosen, drawing line from (0,0,0) to a corner of the project and then zooming to extents exposes the entire coordinate system. On this case, UTM 40S is the coordinate system that is used.
Here is the island on which the project is located.
Shown here is a closeup of the project outline.
This is the shape of the outline as seen in Revit.
What we would like now is for Revit to share the same coordinate system as the Civil 3D file. Right Mouse Click (RMC) on the tool for exporting a shared reference point for Autodesk Revit and “Execute”.
Select a first and second point that defines a vector.
Typically, we would like the elevation of the survey point in Revit to be at 0 m (sea level), so make sure the polyline is also at zero.
Click OK and proceed to export the file to XML format.
Now one must set the shred coordinates of the Revit file from the Civil 3D exported XML file.
For the origin select the same point on the boundary that was used to export the shared coordinates from Civil 3D.
And the endpoint similarly. Note how the instructions indicate that the “y” direction is supposed to be “Up”. In this case it was not found to be necessary. What is important is that the start and end of the vector that is indicated are consistent with how it was defined in Civil 3D for the XML export.
Choose the relevant XML file to set the Shared Coordinates.
Open the location dialogue.
Make the current coordinate system the one shared in from the XML file.
The elevation is zero. This is what is necessary for the Revit Levels to report their height above sea level if required.
Note that True North corresponds to the Civil 3D model.
This can be seen clearly in a 3D view.
Another take on this (Infraworks, Revit, Civil 3D and Navisworks) is given by John Sayre in the following link:
Please contact Micrographics if you require assistance using Shared Coordinates on your BIM project.