[Tagging] relations & paths

[Andy Townsend]

On 15/05/2020 12:28, Paul Allen wrote:
> On Fri, 15 May 2020 at 03:21, Mateusz Konieczny via Tagging 
> <tagging at openstreetmap.org <mailto:tagging at openstreetmap.org>> wrote:
>
>
>     Any signed route may be mapped as a route relation.
>
>
> Depends how broadly or narrowly you define "signed route."
>
>
>     And sometimes signed route will be signed with paint markings on
>     trees,
>     or by piles of rocks or by some other method rather than be a sign.
>
>
> That's a pretty broad definition.  Which is fine by me, because it 
> definitely
> includes footpaths, bridleways, restricted byways, and BOATs in the UK.
> England and Wales have specific signs for such things:
> https://www.simplyhike.co.uk/blogs/blog/a-guide-to-footpath-signs-in-england-and-wales
> Scotland and Northern Ireland also have signs for these things, but 
> they're different
> from the ones in England and Wales.
>
It's probably worth an explanation of "BOATs etc."* for a non-local 
audience.

A "public footpath" is a particular legal designation in England and 
Wales.  It means that, in addition to any other legal rights you might 
have, you're allowed to go from A to B on foot.  These have reference 
numbers (that may actually vary from parish to parish).  An example that 
I'm familiar with is "Ilkeston FP 81" https://overpass-turbo.eu/s/U2f .  
That's made up of 22 different ways on the ground (different surfaces, 
bridges, that sort of thing). It's not in itself a "route" of any sort - 
it's just an attribute of the underlying ways.  There is no 
on-the-ground signage of "Ilkeston FP 81".

That approach to tagging works in the UK because, generally speaking, we 
don't have overlaps of either prow_refs or FWIW highway refs.  In the US 
and countries where route numbers can overlap it would make sense to map 
these as relations in OSM, but here it doesn't, because they don't.

Those 22 ways in OSM are also part of "Erewash Valley Trail" 
https://www.openstreetmap.org/relation/1458963 .  That is a route, and 
it's signed on the ground as such.  Data consumers are then able to use 
that data and present it to users in an appropriate format.  As an 
example, 
https://map.atownsend.org.uk/maps/map/map.html#zoom=17&lat=52.997594&lon=-1.30515 
:

  * Has the prow_ref in black in brackets because they're not typically
    signed
  * Has purple dots for the walking route relation
  * Has the walking route relation name not in brackets because it is signed

Best Regards,

Andy

* "byway open to all traffic"


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