[Talk-transit] Modelling complex stations

[Peter J Stoner]

In message <2DF974A3-16C4-4B43-9737-B743718DC11C at gmail.com>
          Peter Miller <peter.miller at itoworld.com> wrote:


> On 26 Feb 2009, at 09:24, Frankie Roberto wrote:

>> Nice find. Digesting now.
>>
>> One of the problems with the unified stoparea proposal is that it
>> suggests mapping one way per tram/rail track, which currently looks
>> a bit of a mess in the default renderers.
>>
>> Going forward, we'll have to address this somehow. Either we have a
>> way per track, and leave renderers to somehow figure out how to draw
>> a single line through the middle, or have a way per track except at
>> stations, or have a way per track plus a way down the middle for the
>> 'line' (though this'd be a bit confusing when editing).

> I do think we need to spend a bit more time bottoming this out at this
> stage before coding lots of interchanges. As we are aware the
> professional community has also looked at these same issues and we can
> learn from them and borrow from them as appropriate.

> With railways the decision seems to be to have a way per track and
> then use relations to bind these together for some rendering styles.
> This same approach can be used for dual carriageways and complex
> junctions, even though no one has actually done such a rendering to my
> knowledge.

> Knowing what I do about train enthusiasts and public transport
> enthusiasts I think we are going to end up with every set of tracks
> and points in the entire world in OSM! We might start with a single
> way through a station and ignore the fact that there are three
> platforms and six or more actual sets of tracks, but the coding will
> get more and more detailed as more fanatical people get hold of it!

> And it will be great if they do. It will follow the pattern of OSM
> generally where first people did roads, then major buildings, then
> every building and then addresses for buildings and probably are
> considering mapping every plant in every garden next!

> What we need for transport interchanges is a method to do everything
> from the simple overview model where a station is a point feature to
> interchanges that are modelled in great detail.

The potential to add great detail will be useful in coming years.

We currently use the road centre line and it is of course possible to 
show a public transport route offset from the centre line in the 
direction of travel and we can pick up the direction round roundabout 
etc.

However bus stops are usually in one direction only and so are the 
links between pairs of bus stops.  Therefore I can envisage in the 
future wanting to deliver to mapping and navigation systems the exact 
track between two bus stops.

In addition with many buses already equipped with GPS devices there is 
the possibility that at some point this data could be released so it 
would be good if there was a good home for it.




>>
>>
>> Frankie
>>
>> On Thu, Feb 26, 2009 at 8:23 AM, Peter Miller <peter.miller at itoworld.com
>>> wrote:
>>
>> I have been catching up on this great proposal to unify bus/tram/rail
>> interchange modelling....
>> http://wiki.openstreetmap.org/wiki/Proposed_features/unified_stoparea
>>
>> Here is a CEN standards document that has lots of great diagrams of
>> all sorts of transport interchanges from the very large to very small
>> from pages 42 to 66 on this document and proposes how they should be
>> modelled by the professional community in the EU. It is a very new
>> standard, not yet signed off, that covers everything that NaPTAN does
>> not cover.
>> http://www.naptan.org.uk/ifopt/
>>
>> It is worth looking at for ideas about modelling and for suitable
>> terminology. The example interchanges would be good resources against
>> which to test our proposed modelling against before doing loads of
>> coding of actual places.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Peter
>>
>>
>> _______________________________________________
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>> Talk-transit at openstreetmap.org
>> http://lists.openstreetmap.org/listinfo/talk-transit
>>
>>
>>
>> --
>> Frankie Roberto
>> Experience Designer, Rattle
>> 0114 2706977
>> http://www.rattlecentral.com
>>


-- 
Peter J Stoner
UK Regional Coordinator
Traveline                       www.travelinedata.org.uk

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