Export Google Earth to AutoCAD use Global Mapper

Step by step images ( Click to open image )

1.- Select the place and make a polygon of the area in study 

 

2.- Open the file "Kmz" of google earth and setting the proyection, zone, datum and planar units.

3.- Select online Data Source to download. The Data Aster GDEM 2 is free, but no is exact. You can use as reference

 

4.- You can generate contours in the menu "tools"

 

5.- It's possible export the draw in different formats

6.- If you export the draw in format dwg, you will see the contours with elevation