Jokullbase

How to track how late buses are:

• Download bus route data
• Insert raw bus positions into timescaledb/postGIS table?
  • "Fan-out" JSON responses into one DB row per datapoint.
• Download routes.
  • There is an endpoint called Timetable, which takes a route number (along with day of week etc).
  • The timetable response includes a list of stops in the route, along with the route ID.
  • There is an endpoint called BusLocationByStop, which takes a stop ID as a parameter.
    • This information has upcoming arrivals, included estimated arrival time, along with the current position of the bus.
  • Record stop info every few minutes, notably the arrivals.
• Analyze actual arrival vs what the stop endpoint said about the arrival.
  • Use PostGIS to compute "bus arrived" event: When bus is within X meters of a stop on its route, mark that as an arrival event.
  • Once we have bus arrival events, we can compare them to arrivals throughout the day.
  • We can then discard the raw bus position data, as it's not needed to store it: delete every raw data point between the last arrival and the newly computed one.