2010/1/2 Aun Johnsen <li...@gimnechiske.org>:
> Even if you have access to good arial photography, remember that it might be
> out of alignment, it can be a good advise to gather some good fixes to check
> the alignment of your photos, this can be several GPS tracks along your
> trail.

I'm pretty sure the imagery he's refering to is nearmap.com, which I'm
not sure how they manage it exactly but they seem to be about
sub-metre accuracy...

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