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Now we can Create contour lines from Google Earth on auto cad with many method from this method i present this method explained in the link below
http://www.cadingenuity.com///create-contour-lines-from-google-earth.html
I looked at web page, it is not exited. So i will talk generally about answer of above question.
The answer, there error rate between theoretical and practical method depends on Precision and accuracy of measurement and transformation data from google earth to autocad, also error results from user error and other error types.
I hope to send me method that you used to transform from google earth to autocad, to give you specific answer.
Good Day
oui c possible le bien c'est prendre le levé en lui même et il y'a autre site plus pratique que GOOGLE EARTH , merci