What datum (reference ellipsoid) does Google Earth use?
I can't seem to find where Google Earth tells explicitly what datum they use. I need some sort of valid link.
 The default free version that you download from Google.
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According to Does Google Earth use WGS84 (G1762)?:
Google Earth itself doesnt do any projection or anything, but by convention all the data (imagry, KML etc) 'imported' into Google Earth uses WGS84.