[OSM-talk] When images are not calibrated

[Mike Thompson]

The Strava Global Heatmap is a good reference.  It is the average of all of
their users who have cycled, ran, hiked, etc. on a given street or path
over the last two years.

Also, if you can get permission from your local government to use their
aerial imagery, it is generally more accurate than satellite imagery.

Mike

On Tue, Aug 17, 2021 at 7:51 AM Jeremy Harris <jgh at wizmail.org> wrote:

> On 17/08/2021 13:51, john whelan wrote:
> > I suspect 5 to 10 meters is about as good as we can reasonably expect.
>
> Here in the UK I found GPS tracks to be better than nothing but not
> "good", as a reference for aligning imagery.  No better than a couple
> of metres, even using junctions with heavy and perpendicular traffic,
> trying to eyeball a centroid.
>
> It turns out we're blessed with Land Regisitry boundaries
> which we can regard as "perfect", and comparing with fences
> (usually between gardens of suburban houses), get better than 10cm.
>
> --
> Cheers,
>    Jeremy
>
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