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So around 30 meters depending on the zone of the earth. But thats horizontal precision vertical precision can be worst acornding with some publications up to 15m If you want to process your own model I wil recomend ASTER-GDEM But you will have to process them and deal with the voids
https://www.reddit.com/r/gis/comments/lczuab/how_accurate_is_google_earth_elevation/
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