[OSM-dev] How to get the order of bus stops in a bus route?

Shuyan Chen chenshuyan0221 at hotmail.com
Wed Feb 10 13:04:45 GMT 2010


Hi, Jonathan

Thanks for your comments.

>i) 1 bus stop = 1 node
>ii) 1 bus route from origin to destination = 1 relation containing : the origin->destination route way + the bus stops nodes for this route ; those stops may be a nodes of route way or nodes not contained in >the route way but close by enough.

>Are there already any similar or different implementations of i) / ii) on osm.org data ?

I just want to find a way to get ii) for a bus route in relations to implement path find algorithm. 

Regards,

Shuyan


From: Jonathan-David SCHRODER 
Sent: Wednesday, February 10, 2010 1:52 PM
To: Shuyan Chen 
Cc: dev at openstreetmap.org 
Subject: Re: [OSM-dev] How to get the order of bus stops in a bus route?


Hi,
I am designing aloud, what do you think of this : 
i) 1 bus stop = 1 node
ii) 1 bus route from origin to destination = 1 relation containing : the origin->destination route way + the bus stops nodes for this route ; those stops may be a nodes of route way or nodes not contained in the route way but close by enough.

Are there already any similar or different implementations of i) / ii) on osm.org data ?

For ii) to work in path find algorithms, the latter should assume that an ii) node separate from the route that's being considered, can be replaced by the ii) node closest to the former separate ii) node.

For example, if we just want to display a polyline / sub-way of BR route from A to B...
...here's one idea for a very simple use case where a user wants to go from bus stop A to bus stop B, A & B on a same bus route BR. 

1) starting node is A, destination node is B, directions steps is empty
   append A to directions nodes
   append B to directions nodes
2) directions finding, every following appending equals appending [A, [here,...] ,B], without touching A and B :
   if A is not part of BR's way, then make the directions finding algorithm origin point be the closest node to A on BR way that is also closest in route distance to B; end if
   same for B, make algorithm's destination point be the closest node to B on BR way that is also closest in route distance to A
3)   run directions algorithm's and append nodes if any.. calculate estimate travel duration
4) display polyline / way made up of [A,...intermediate nodes..,B]

Jonathan


2010/2/10 Shuyan Chen <chenshuyan0221 at hotmail.com>

  Dear all,

  I would like to get  the bus stops in order in a route for bus transit service ,including the bus route starting point and end point(bus station or terminus).

  Can anybody provide any ideas on how to achieve it? Thanks in advance.

  Regards,

  Shuyan



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