[OSM-talk] Defective GPS trace

[Anthony]

On Fri, Jan 1, 2010 at 11:40 AM, Craig Wallace <craigw84 at fastmail.fm> wrote:

> On 01/01/2010 14:14, Steve Bennett wrote:
> > Well...ok. But in this case I have the aerial photography, so I can just
> > trace it, once I know more or less where the path goes.
>


>  Though yes, this is not really necessary if you have accurate aerial
> photography that you can trace from.
>

Of course, how can you know whether or not you have accurate aerial photos
if you're not sure of the accuracy of your GPS readings?

Aerials aren't always georectified correctly.  The more independent sources
you have, the better.
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