Technology
Typically Journey Planners use an efficient in-memory representation of the network and timetable to allow the rapid searching of a large number of paths. Database queries may also be used where the number of nodes needed to compute a journey is small, and to access ancillary information relating to the journey.
A single engine may contain the entire transport network, and its schedules, or may allow the distributed computation of journeys using a distributed journey planning protocol such as JourneyWeb or Delfi Protocol.
A Journey Planner engine may be accessed by different front ends, using a Software Protocol or Application Program Interface specialised for journey queries, to provide a User Interface on different types of device.
The development of Journey Planning engines has gone hand in hand with the development of data standards for representing the stops, routes and timetables of the network, such as TransXChange, NaPTAN as well as such as Transmodel that ensure that these fit together.
Read more about this topic: Journey Planner
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