[Talk-transit] Proposal for a new transport tag

[Janko Mihelić]

2012/3/1 Erik Johansson <emj at kth.se>

> On Wed, Feb 29, 2012 at 16:07, Janko Mihelić <janjko at gmail.com> wrote:
>
> The interpretation of what a low volume line is and isn't seems hard,
> and probably differ a lot between different areas.
>
> How do I do the decision that:
>  "transport_frequency=Mo-Fr 08:00-23:00 t30; Sa 08:00-22:00 t25"
> means
>  render as low volume
>
> Do you have code for this?
>

I have no code for now, only ideas.

I think that a gradual change of frequency would be better than a cut off
at a number of trips. The change would be visualised with hues of blue and
red.  It would be best if the number for low and high volume would be
picked differently for each operator. For example, take the lowest and
highest frequency of one operator, those are blue and red, purple in the
middle.

This can't be done only with the renderer, there should be a pre-render
re-factoring of the planet file.

"transport_frequency=Mo-Fr 08:00-23:00 t30; Sa 08:00-22:00 t25"
This one would be ( 30/24 + 25/24 ) / 2 = 1.146 trips per hour

It leaves out starting and ending time of the line, but I think that's
enough information for a map with one layer.

Janko
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