How to create the toposurface by importing 3D data from sketchup pro

I need a toposurface for the property I want to work on. I downloaded trial version of sketchup pro and selected the property by add location tab.
When I imported it as a 3D model in revit to create the toposurface for the property it was showing location terrain rather than google earth terrain when I tried to make a toposurface by selecting the imported file.
How can I get the google earth terrain from sketchup pro for my project which can act as a toposurface for the property.