[GraphHopper] Suitable (for routing/turn-to-turn navigation) tagging for junction names and traffic signal names?

[Lukas Sommer]

Hey Peter.

Thanks for your response.

Indeed we didn’t want to simply “map towards the routing engine”. But we
would like to here varios opinions – if routing is possible, if rendering
is possible, and over all if it is suitable for the community (=easy to
use).

The idea of possibility 4 was to draw an area more or less there where you
find the junction on the ground.
http://www.file-upload.net/download-9283152/junction_mockup.png.html has a
picture (didn’t know where to upload elsewhere, sorry for inconvenience).
The green line is the way in OSM that forms our junction area. The blue
points are nodes that are shared between the area and the incoming/outgoing
ways (highway=*).

The reason for this idea was that is is easier to use for beginners. It is
less complex than a relation. And you do not have to duplicate information
like in possibility, so you will probably have less work to do it – and
less spelling errors in the database. Our idea was that its maybe easier to
use for routing engines that possibility 1. Is this correct or no?

Regards

Lukas

Lukas Sommer


2014-07-27 20:13 GMT+00:00 Peter <graphhopper at gmx.de>:

>  Hey Lukas,
>
> first of all, I think one should not map towards a routing engine or
> renderer although I sometimes wish it was ;). Instead I would try to make
> it how it is in reality.
>
> Of course from a programmers perspective point 2 would be the simplest.
> But point 3 would be probably closer to reality and also easy to implement.
>
> I'm not sure I understand point 4: will the area be connected to the ways
> or just 'overlap' the area where the way form the junction? Then this would
> be as complex as point 1 to implement as one would have to query some
> spatial helper datastructure, but maybe point 1 is the hardest (just
> guessing).
>
> 1 and 4 are of course not impossible, but more complex than 2 or 3.
>
> Regards,
> Peter.
>
>
> On 27.07.2014 13:23, Lukas Sommer wrote:
>
>  Hello.
>
>  There are currently some efforts to get junction names and traffic signal
> names rendered in openstreetmap-carto. The tagging for complex junctions
> isn’t yet well defined. So I would like to hear your opinion and your
> advice about which of our ideas would be suitable/best for
> routing/turn-to-turn navigation.
>
> Background:In some countries (Japan, Korea, Ivory Coast…) people orient
> themselves in the local area using the names of road junctions (like
> crossroads or roundabouts) or traffic signals rather then the names of
> streets. While street names also exist, they are not important for
> orientation. (Note: This is about orientation in the local area, thus
> different from the names of motorway junctions who’s names serve for
> orientation at large distances.)
>
> Example:
> http://wiki.openstreetmap.org/wiki/File:Junction_yes_example_2.png
>
> Possibility 1: A simple node in the middle of the junction. This node
> contains the name of the junction. The node is not connected with any of
> the ways.
>
> Possibility 2: All shared nodes (of the crossing ways) contain the name of
> the junction.
>
>  Possibility 3: A relation contains the name of the junction and has all
> shared nodes (of the crossing ways) as members.
>
>  Possiblity 4: An area contains the name of the junction. The area covers
> the outline of the physical area of the junction on the ground. The area
> shares individual nodes with all incoming and outgoing ways. (In the
> example: 8 shared nodes)
>
>  From the point of view of a developer of routing/turn-to-turn
> navigation: Which of theses solutions would be perfect, which would be
> still acceptable, and which would be a no-go?
>
> Lukas Sommer
>
>
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