[Tagging] navigational aid relation

[Florian Lohoff]

Hi,

Management Summary:
 In navigation/routing the point the router is routing to is the nearest
 point on the routable network from the poi/address we like to navigate
 to. The nearest point may not be a location where the address/poi can be
 reached from.
 I suggest a navigational aid relation hinting the link between
 geocoding and router to use a different point on the routable network.


In 2019 i already sketched a problem where the normal "Geocode Address",
"Look for the nearest road" fails miserable for some addresses. There is
a multitude of issues here. Access tag overblocking, huge industrial
complexes, or simply addresses which do not have an easy way for your
mode of transport.

So i suggest a relation like this

	type=navaid
	name=<Name of destination> - Optional
	source=<node, way, relation> - Original object we like to reach
	destination:motor_vehicle=<node> - Exakt navigation point to get to

So when the geocoder returns a node, way, relation given in the "source"
of this navaid relation, and our mode of transportation is listed in the
"destination:<modeoftransport>" we replace the location from the
geocoder with the destination from the relation.

Example 1:

This is a map i am producing weekly for parts of Germany which shows
addresses on a map when their "nearest road" has a different name. Its
not perfect but you get the idea. (Data bases on the nearest API call in 
OSRM)

https://osm.zz.de/dbview/?db=addresses-nrw&layer=namemismatch#51.98796,8.57338,17z

In this case we have the addresses 114a, and 114b which are behind a
long driveway which somebody tagged as unaccessible. The public road
has a life_gate so there is no real way to get there. But we most likely
want people get to the lift gate. So we would create a navaid relation
for 
	type=navaid
	source=<building way of 114a>
	source=<building way of 114b>
	destination=<node of the lift_gate>

Example 2:

This is the Corporate Fire Brigade within a large industrial compound.
You'll be routed to the next Motorway.

https://osm.zz.de/dbview/?db=addresses-nrw&layer=namemismatch#52.00001,8.6192,17z

	type=navaid
	source=<building way of fire_station>
	destination=<gate of industrial compound>

Possibly adding all POI and Addresses within that compound as source so
all people visiting Mitsubishi Papers in Bielefeld will be routed to the
Gate not some street around.


You may pan around the map and find solutions for all those problems.
Sometimes its just the house at the corner - i'd say - okay - no issue.
But sometimes its so utterly broken and people end up on the Motorway, 
in the middle of the Woods, on the other side of the Canal etc
with the message "You have reached your destination".


I am not really interested in discussions about necessity of this
relation, as it is obvious that this or something similiar is needed and
the problem is unfixable with data manipulation while keeping to
"Ground truth". I am more interested in people Geocoding and Routing
whether this would be a viable way to go, or if anyone can envision 
simpler solutions.
		
Flo
-- 
Florian Lohoff                                                     f at zz.de
  Any sufficiently advanced technology is indistinguishable from magic.
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