Am 29.02.2012 16:07, schrieb Janko Mihelić:
Hello,
The problem with rendering transit lines right now is that the busy lines
are rendered the same as the lines that go a few times a day. Those
differences between lines should be seen right away, but we don't have that
information in the database right now.
I agree that the best solution would be to have the whole timetable for
different transit lines, but this is often not possible and very hard to
maintain. Transiki<https://github.com/SteveC/transiki> gave us some hope
that this could be manageable, but unfortunately the project was shut down.
I propose a temporary middle solution. Every bus route relation could have
a tag similar to the
opening_hours<http://wiki.openstreetmap.org/wiki/Key:opening_hours>tag.
This way we could know if a line is only active on weekends, or if it
is a night line. Or maybe it only runs in the morning and in the evening.
We could upgrade this tag, and put a number of trips in each time period.
This can be an estimate, a trip more or less a day is not much.
It would look like this:
Only ferquency:
*transport_frequency*=t5
this means that a bus route has 5 trips a day.
Only days:
*transport_frequency*=Sa-Su
this bus route only goes on weekends
Only time:
*transport_frequency*=00:00-04:00
Night line
A little more information:
*transport_frequency***=Mo-Fr 08:00-23:00 t30; Sa 08:00-22:00 t25
30 trips a day from Monday till Friday, first trip at 8 in the morning,
last at 10 in the evening. Similar for Saturday.
And so on. I added a "t" in front of the number of trips so it is easier to
see, maybe it is not needed. Or maybe this could be done in a completely
different way.
Sounds interesting. For densly populated areas, it would be better to
give a frequency per hour, or every xy minutes.
But how should the renderer treat a service by three bus lines runnig
every hour? Together they serve every 20 minutes, or arrive at the same
time to give people a chance to change the bus.
The renderer has to lock up every bus service on a road, and count them
together. This is not a simple thing with current mapnik.
Greetings,
Andre Joost
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