About Positioning Linked Topography

When you link topography to the Revit model, the topography is placed in the Revit model using automatic positioning.

• If they use the same coordinate system, the topography is positioned using shared coordinates.

  That is, the World Coordinate System (WCS) origin of the linked topography is aligned to the Revit model using real-world coordinates specified for the survey point or the project base point. See Specify Coordinates Before Linking Site Data.

• If they use different coordinate systems or if topography coordinates are not defined, the topography is positioned center to center with the model. Move the topography to the desired location, and pin it in place.

If the Revit model uses different coordinates from the topography, a dialog asks whether you want to do the following:

• Align: Use coordinates from the topography to define the geolocation of the Revit model.

  You can then check to confirm the coordinates of the project base point and the survey point. You can also click Manage tabProject Location panel (Location) to see the newly assigned latitude and longitude for the model.

• Position center to center: Position the topography center to center with the model.

  You must then move the topography to the desired location, and pin it in place.

Note: You cannot use the Publish Coordinates tool to push coordinates from the Revit model to the linked topography. Instead, provide grid coordinates to the civil engineer and ask them to update the original topography file. When the engineer publishes the surfaces again and you reload the topography into the Revit model, it is automatically positioned using shared coordinates.