[Proj] Google Earth Accuracy

Thomas Knudsen knudsen.thomas at gmail.com
Sun Nov 30 10:08:15 EST 2008

2008/11/30 Ethan Alpert <ealpert at digitalglobe.com>

> How come no ones questioning the accuracy of the sensors that collected
> the imagery in Google Maps? I happen to know that satellite imagery is
> not very accurate unless you have decent ground control and a DEM. Even
> then it's not that great. It seems pointless to try to determine
> accuracy in Google Maps unless you understand where the imagery came
> from and how it was produced.

At least where I live (Copenhagen, Denmark), the high resolution
layers of Google Maps come from very high precision
photogrametrically derived orthophotos, which should certainly
have an accuracy way better than the "few meters with occational
ten meter blunders" quoted earlier in this thread.
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