[Talk-transit] [Spam] Re: Multiple tracks

Richard Mann richard.mann.westoxford at googlemail.com
Wed Jun 24 13:31:03 BST 2009

Choosing not to render a point because there's something else more important
close by is relatively easy. Aggregating adjacent lines is much (much)
harder. Identifying the number of lines that are adjacent is much
(much) easier for the tagger than for the renderer.

But I seem to be repeating myself; you either believe me or you don't.


On Tue, Jun 23, 2009 at 7:52 AM, Frankie Roberto <frankie at frankieroberto.com
> wrote:

>  On Mon, Jun 22, 2009 at 5:21 PM, Peter Miller <peter.miller at itoworld.com>wrote:
>> Can I suggest that as a start you create the detailed track layout and
>> then we can look at different grouping strategies and see which ones the
>> Mapnik people and routing people will find useful. Whatever you do should
>> work for rail and trams and I see no reason for there not to be generality
>> with roads. Lets not worry too much about the wrapping until we have stuff
>> to wrap.
> I think this is a good approach.  Using a tracks=1ofX tag could end up a
> complete waste of time if renderers can use the relations to dynamically
> pick whether to draw one track or more anyway.  Mapnik seems to decide how
> many POIs to render based partly on how many it can fit on the map, so this
> doesn't seem infeasible.
> I'd like to see some discussion about strategies for tagging individual
> tracks though. I've attempted to do it in a few places, but mainly only at
> stations (where I've also drawn the platforms).
> Has anyone attempted to draw the switches where two lines meet? How about
> adding oneway=yes? Level crossings?
> Frankie
> --
> Frankie Roberto
> Experience Designer, Rattle
> 0114 2706977
> http://www.rattlecentral.com
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