[Tagging] Using destination_sign relations for pedestrian navigation

[Antoine Riche]

Hello.

We are working with SNCF, the french railway company, to provide 
pedestrian navigation inside and around railway stations in the Greater 
Paris area. A dedicated routing engine, which provides indoor/outdoor 
navigation and supports area routing, has been developed – this will be 
presented during SOTM in Heidelberg.

In order to improve the user experience, we want to provide walking 
instructions such as "take the exit 'Rue de Londres'" or "Walk through 
the gate labelled 'Northern lines'" rather than "Walk 75 metres then 
turn left". Our problem is that such waypoints may have a different name 
depending on the direction you cross them. The solution we used is to 
create, when there is such an ambiguity, two destination_sign relations 
pointing to the same 'intersection' member, one for each direction with 
the 'from' and 'to' members swapped. Here is an example at Juvisy 
station : the entrance named 'Accès Danton' when walking in 
(https://www.osm.org/relation/9471596) is named 'Quartier Seine' when 
walking out (https://www.osm.org/relation/9471597).

I wish to amend the Wiki to explain that destination_sign relations can 
also be used for pedestrian and indoor routing, not just at 
"crossroads". Does that require opening a discussion in the discussion 
page, or may I just go ahead ?

Now since the routing engine supports area routing, we need to loosen 
some constraints on the members, that are documented on the wiki and 
enforced by the JOSM validator :
1/ allow areas for the 'from' and 'to' members, as in this example : 
https://www.osm.org/relation/9722912
2/ allow multiple 'intersection' members, so that multiple doors can be 
referenced by a single relation – example in Gare Montparnasse : 
https://www.osm.org/relation/9823029
3/ allow multiple 'to' members, so that the same relation can point to 
both a line and an area, and cover linear and area routing (no example 
but I could create one).

Are there objections to this proposal ? Do you recommend to open this 
subject on the Discussion page or is it best discussing it on this list ?

Regards,
Antoine.

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