Publish Model to Google Earth
This video describe how to export Autocad objects from Model space in Civil3D to Google Earth.
1.) Setup correct Drawing units in this case Sweden coordinatesystem Sweref 99 15 00, Save file
2.) Go to To Toolbox in Civil3D Prospector or type command "EXPORTKML" than comes dialog "Export KML"
Genral - give a name for project in Google Earth
Objects - select all or these objects to publish
Geo-Reference - Drawing coordinate system transform
Nudge - heights
File - KML name
Press Export and than View!