[Talk-transit] a little idea for new public transport shema

[viw at freenet.de]

Hi,
 
I think there are two advantages if you use segments from one to the next step only.
The first is you can use the segements later for routes that don´t fit in the hole segment.
If the bus run form A to D and than  to F instead of E. Now you have two segments for almost the same way  between A and D or you change all routes using the segment A to E.
And the secound one is that you can  find the exakt stop position as start or end of a segment without any  further tags for this points.
 
And last but not least I think this shema would better fit into other standards like GTFS or HAFAS and so on.
 
regards Jan
-----Ursprüngliche Nachricht-----
 Von: "Jo" [winfixit at gmail.com]
 Gesendet: Do. 26.12.2013 17:04
 An: "Public transport/transit/shared taxi related topics" [talk-transit at openstreetmap.org]
 Betreff: Re: [Talk-transit] a little idea for new public transport shema

Since I'm the one who proposed this initially, I'm going to add some more detail.

Stops on opposing sides of a street are hardly ever, exactly opposite one another, so usually there are 2 stop_positions. This means there will usually be pairs of route_segment relations, one for each direction.
 
For stops near a crossing, where some bus lines go to the right, others straight on and others to the left, the (high)way up to the crossing can become member of up to 6 relations. But that's still better than to have them as members of all route relations and their variations for a line.
 
Having a route_segment for each sequence of highways between two stops, is a possibility, but there I don't see a reason why a segment couldn't describe how the bus goes from A to E passing B, C and D.
 
Unfortunately, one of the advantages of the Oxomoa scheme (being able to oversee immediately that a route is continuous in the relation editor) would be lost with the use of subrelations. This can be fixed, given support is programmed for it in the relation editor (thinking mostly of JOSM here).
 

The biggest advantage is that now it's the route_segments wich become broken instead of. It's a lot easier to fix those segments once instead of fixing tens of route relations which would otherwise be present on those highways.
 
Lastly I want to add that in some cases (around bus stations which are mapped in full detail for example), there would still be a need to add (high)ways to the route relations themselves in some cases.Polyglot

2013/12/26  <viw at freenet.de>
 Hi,

i have read some mails about problems with too much relations for public transport lines.
Also I see a problem with stoppoints and platforms specaly by bus and tram lines.
 And maintain with other Data maybe not very easy esp. GTFS data.

In most systems I know there are stored segemts between two stops and these segments together are a lineroute.
These segemnts, I think, have some advantages:
 - only one relation for each direction on the between most stops
- no need for stoppoints because the relation starts and ends at a stoppoint near the platform
- easy to ad new lines because the can use existing segments
 - most flexibility because small segments ( this may be a disadvantage too because it need much work at the start)

regards Jan
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