[Talk-GB] National Cycle Network discrepancies between Sustrans and OSM data

[Ian Dent]

> Q: Do you see this as an aid to local mappers for direct survey/ OSM 
> edit / engagement with Sustrans, or are you looking to collect 
> discrepancies for wider discussion please?
>
Hopefully the map is a help to local mappers to aid them on where to 
focus their attention. As expected, most of the discrepancies are due to 
the Sustrans data rather than the OSM data and I'm keen to get Sustrans 
to create a process (that works!) for accepting error corrections. If 
this is successful, local mappers should be able to report their 
findings to Sustrans and get the "official" NCN changed. This isn't in 
place yet nor do I have any promises so work still to be done!

I can't do anything with specifics of local errors so I don't intend to 
collect those but, if people identify a whole new class of errors then 
I'm interested - for example, I noted that ferries and NCN routes are 
treated differently (sometimes) between OSM and Sustrans.

The map may prompt local mappers to examine an area where there have 
been NCN improvements and the OSM data needs to be updated.

>
> A quick look at the comparison across Northumberland suggests:
>
> * Most of the flagged discrepancies are down to low-polygon mapping 
> such as on corners or "wiggly routes". OSM looks more correct.
>   e.g. Blyth South Beach dunes - although it's full of dog walkers, so 
> use the Links Road path!
I'm surprised that Ordnance Survey are accepting the Sustrans data at 
the current level of resolution (i.e. which removes the "wiggly" bits) 
but this doesn't generally affect people following the route or routing 
apps so probably lowest priority for Sustrans to fix. Fixing the 
problems where the routes are different (e.g. Alwinton) is much more 
important.

At the moment people may plot a route using Ordnance Survey data from 
the Sustrans website and then try and follow the route using an app 
(e.g. Komoot) which uses the OSM data - confusion ensues and I'd hope 
Sustrans would like to avoid this.

Thanks for your input,

Ian
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