[Tagging] The direction=* tag

yo paseopor yopaseopor at gmail.com
Fri Mar 17 23:28:43 UTC 2017

>  But at present I am pretty sure that map rendering can’t use
> “direction=forward | backward”. It can (and my rendering does) use the
> compass points and/or degrees values for rotating icons in the point
> symbolizer.

As you can see Kendzi3D plug-in [1] and a style for JOSM [2] do it with
forward/backward keys.Others do too.

Salut i mapes (Health and maps)

[1] http://imgur.com/RFVKLGZ
[2] http://imgur.com/9tCwVBT

On Fri, Mar 17, 2017 at 11:24 PM, Tod Fitch <tod at fitchdesign.com> wrote:

> If micro mapping, then the stop sign is usually not in the center of the
> traveled way (though I have occasionally seen some there). For micro
> mapping, place a node for the sign where it exists on the side of the road
> and then use the compass direction to indicate how it is facing. As it is
> detached from the highway way forward and backward can have no meaning.
> The “highway=stop | give_way” tag on a node on way might be used by map
> rendering, which probably doesn’t care if it has forward or backward
> tagging. I’ve been using Mapnik XML for rendering my maps and I don’t
> recall the ability to detect the direction of a way. Or even if something
> that is being rendered by the point symbolizer can tell if the point is on
> a way. I could be wrong on that. And even if wrong, maybe some rendering
> tool chain will support that in the future. But at present I am pretty sure
> that map rendering can’t use “direction=forward | backward”. It can (and my
> rendering does) use the compass points and/or degrees values for rotating
> icons in the point symbolizer.
> I strongly suspect that tagging the stop/give way sign in the middle of
> the way is for the use of routing and route guidance. It might still be of
> use by guidance (though I am not sure the “direction=forward | backward”
> matters much in that case) but what I am hearing is that as
> implemented/specified now it is not useful for routing. Thus my comment
> about noise.
> I have been following the tagging suggested on the wiki [1] and checking
> the direction of the way in order to determine the value to put on the
> direction tag is tedious. If it is not being used, I might well forgo the
> direction tag. Fortunately the same wiki page states direction is only
> needed if the signs are closely spaced and it is not obvious which
> intersection/direction the sign is for, so the direction tag in that case
> is almost always optional per my interpretation of the wiki.
> Cheers!
> [1] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dstop#
> Tagging_minor_road_stops
> > On Mar 17, 2017, at 2:47 PM, yo paseopor <yopaseopor at gmail.com> wrote:
> >
> > I don't agree with this: marking the direction of the traffic sign is
> not noise, for a driver can be VITAL, also with the meaning of the traffic
> sign (the main purpose of a traffic sign).
> > Why? Because in a way with two directions we need to know to what
> direction traffic sign it is for. It is not the same a road cross with an
> STOP forward than backward (with micromapping it is not the same one lamp
> than two)
> > Put a key like direction is not the best option, because this
> information can be inside the key itself like traffic_sign:forward or
> traffic_sign:backward.
> > Also it is a good thing to say of what side of the way the traffic sign
> is.
> > In some countries traffic sign of a side is not the same as the other
> side specially in streets in a city.
> > e.g.
> >
> > traffic_sign:forward=ES:R2
> > highway=stop
> > side=right
> >
> > Ok, OSMR do not use that...but other tools uses this information so it
> is important to keep it at the data.
> > In a short-term, people like Mapillary or OSC will give us the
> opportunity (and the data) to map all the traffic signs in a way. Routers
> and navigation apps should be prepared for that. OSM is nowadays capable of
> show all this information. Don't make it disappear.
> >
> > Salut i mapes (Health and maps)
> > yopaseopor
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