Bernd Wurst wrote:
Voll dafür. So lange mein proprietäres Navi mehr Infos über eine Kreuzung
liefert als wir erfassen können, läuft was schief. :)
Das war auch bei mir der Auslöser mir diese Gedanken zu machen.
Zu deinem Vorschlag vom letzten Mal:
rechts halten und links halten sollte auch noch möglich sein, für den
Fall
wenn sich eine mehrspurige Straße teilt und es kein Abbiegen nach halb-rechts
ist.
Jepp, hab ich drin.
Ebenso habe ich jetzt komplexere Kreuzungen vorgesehen, also welche, die
viele Nodes, Abbiegespuren, Überleitungen etc. haben. Ein Autobahnkreuz
läßt sich jetzt als eine Kreuzung beschreiben. Eine Kreuzung mit 6
Straßen, 9 Radwegen, 4 Fußgängertunneln und einem Zebrastreifen auch.
Wichtig wäre IMHO, dass du das was du letztes mal geschrieben hast (plus das
oben) in eine Wiki-Seite umformulierst. Ich wäre dein erster User dieser
Relation.
Erst mal hier, da bekomm ich mehr Verrisse ...ähm... Feedback ;)
Und für die Kritiker: Eine 08/15-Kreuzung, die das Navi auch korrekt aus den
Daten interpretieren kann, muss man natürlich nicht so erfassen. Nur weil das
letztes Mal gleich als das-ist-so-viel-Arbeit-Argument kam. :)
Genau. Hab ich jetzt auch oben reingechrieben.
So, hier der Entwurf. Ich muss nochmal nachschauen, ob ich Crossing
lasse, oder ob Junction o.ä. besser wäre.
=Advanced Crossing Relation
==General
The advanced crossing relation (ACR) is intended to describe all
possible transitions from one street to another that can happen at a
crossing. As such it is quite complicated, but it is not intended to
replace existing relations or tags, but to help model crossings that can
not be described correctly using these. So if a simple turn restriction
relation is enough for your crossing, just use that easier tun
restriction relation.
==About the model
The ACR sees a crossing as a number of ways that have exactly 2 ends and
a number of nodes that connect those ways. Any possible path then can be
describes as a series of ways and nodes, starting and ending with a way.
For any of those paths, the ACR describes how a human driving
(cycling/riding/walking/...) along it would experience it. Or, to name
the expected usage, what a satnav (a.k.a. GPS, a.k.a. navi) would have
to announce so the human would take that path.
==Type
The type of the relation is ACR.
==Roles
All ways and nodes belonging to the crossing (that includes the ways
that only have one end at the crossing) are included in the relation
exactly once. Their tag must be an unique (within the relation) string
containing numbers and letter only. Please note that that is a
difference to other relations that have fixed role names.
==Tags
Every tag describes one path in the crossing, that may be a complete
path through the crossing, or just one step. Generally speaking one path
corresponds to one announcement of the satnav system.
===Tag Keys
Tag keys are constructed from the role names. Again here the ACR differs
from other relations that use fixed key names.
To construct the key, concatenate the role names of all parts of the
path, separated with an underscore (_).
===Tag Values
The value describes the path. Possible values are:
no - this path cannot be taken (this is the default for all thinkable
paths that are not modeled).
auto - this path will be taken automatically by following the road. A
satnav does not need (nor should) announce anything.
straight - to take this path, you must go straight ahead, leaving the
road you're on.
right, left - turn right or left to take this path.
sharp right, sharp left - make a sharp turn. Use this only if you've
already have used up the right/left or if it would be difficult to
follow the satnav's directions with a simple left/right announcement.
half right, half left - see sharp
uturn - this is a u-turn at a position where it is allowed and possible.
Use this one for special u-turn lanes. The satnav should announce this
as a definite instruction.
possible uturn - here it is possible to turn, but there are no special
lanes or signs. The satnav should announce this with care, e.g. by
adding if possible to it's instruction. (Please note that a pedestrian
can always and everywhere do a u-turn. No need to model that...)
exit right, exit left - this is an exit from a motorway or trunk road,
or some construct that looksfeels the same.
right lane, left lane, center lane - here the driver has to chose the
right lane, that later will move away from the main body of the street.
No turning involved.
parallel lane - this is the special lane at large motorway crossings
that runs parallel to the main body and leads to the real exits. Hint:
To use such a crossing you'd need to follow exit, exit or exit,
parallel, exit.
roundabout 1, roundabout 2, etc. - this is a path leading through a
roundabout, the number says which exit from the roundabout to the, e.g.
leave the roundabout at the 3rd exit. As an exception to the
