On 04/09/2010 06:53, Steve Bennett wrote:
On Fri, Sep 3, 2010 at 2:37 AM, M∡rtin Koppenhoefer
<[email protected]> wrote:
so you are talking about rendering?
Primarily, yes. But could be useful for other applications. For
example, to do public transport routing, you would want to operate at
the level of "the train line", not at the level of an individual
track.
If you mean "which train do I catch to get from A to B" the the presence
of the tracks says nothing about the route of the train services. On the
other hand if you are working for the train (infrastructure) company
planning a train path from A to B you will need to know all the details
about the individual tracks and where they connect. Multiple train
tracks are definitely conceptually different to multiple lanes on a
motorway. In a car on the motorway you can change lanes wherever you
like - all the lanes are normally equivalent to each other (exceptions
include crawler lanes, carpool lanes etc etc). Trains are only able to
change tracks where there are points/switches.
Colin
_______________________________________________
Tagging mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/tagging
