On 02/03/2011 12:04 PM, Richard Mann wrote:
On Thu, Feb 3, 2011 at 5:40 AM, Dominik Mahrer (Teddy)<[email protected]> wrote:
I do not think it is a good idea to redefine thousands of used
railway=tram_stop.
The problem is that railway=tram_stop is used to mean a number of
different things, which have different geo-locations when you start
mapping in more detail. You are emphasising one particular meaning
(the stop area centroid), and other people emphasise another meaning
(an indicator of the boarding location). We can't know which is
dominant.
To ensure basic compatibility, I suggest all schemes should use nodes
tagged railway=tram_stop, and make them ordered members of the route
relation with role=stop (or maybe forward_stop/backward_stop). I don't
think we need to be prescriptive about where those nodes are placed,
just tell people there are two basic options (on track or either side
of the track). I think the "simplified" scheme probably _recommends_
these nodes should in due course be beside the track, and possibly on
platforms, and that something else (railway=tram_station) should go on
the centroid as a courtesy tag.
I agree that the courtesy tag probably won't hurt much if mappers decide
to use that. I would in fact tend towards using
public_transport=stop_position, as suggested by Dominik, given that it's
already being used. (While I consider that beyond the scope of the
proposal, we might still keep it in mind for a future amendment).
In fact, even if we decide on placing tram stop nodes next to the way, I
don't think the existing nodes will do much harm. They continue to be
perfectly valid - the only information they lack is which side of the
track they are on. It's the equivalent of representing a parking lot by
a single point tagged "amenity=parking", or one single way tagged
"railway=rail" going into a railway terminus of 20 or 30 platforms - not
incorrect but just not very detailed. I wouldn't start a cleaning binge
in my area, during the course of which I move all stops - I'd probably
update them "on the fly" when I'm editing in the surroundings anyway.
However, making the position of the tram stop a recommendation (on the
way is OK, but next to the way is detailed and thus preferred) sounds
like a good compromise.
Michael
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