2010/1/2 Anthony <[email protected]>: > This seems like somewhere that the wisdom of crowds actually applies. I > think I'd trust the average of a bunch of independent GPS traces to a single > orthorectified aerial - especially in an area which isn't extremely flat. > But I guess I might be convinced otherwise, if I'm actually shown the > "sub-metre accuracy" claim, which presumably outlines the methods utilized > to ensure such accuracy.
Average sub-metre error would still allow for a place or two with 50m error especially over a big area such as Australia, and Steve might have visited one of these places. It would be best to just go there again and see if on the second survey the error is siginificantly lower (or there's still error but the the vector is opposite direction). For example based on GPS traces I can say with some confidence that Yahoo is on average < 3m off in my city even though there is a couple of places that are badly mangled. Cheers _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
