hafas-find-trips

Provide location and bearing, get the public transport vehicle you're most likely in.

Location and bearing are expected to be inaccurate because they come from a mobile device. Also, The vehicle movements from the underlying radar() API are often not the actual position, but the estimated position, based on their current delays and their track. To compensate for this, hafas-find-trips

• filters by product if you provide one,
• checks if the location is close to where vehicles have recently been or will soon be,
• takes the bearing of each vehicle into account.

Installation

npm install hafas-find-trips

Usage

Provide a track of user locations from the last ~10 seconds as GeoJSON LineString. If possible, provide a product in addition.

const findTrips = require('hafas-find-trips')
const createHafas = require('vbb-hafas')

const hafas = createHafas('my-awesome-program')

findTrips(hafas, {
	recording: {
		type: 'Feature',
		properties: {},
		geometry: { // GeoJSON LineString
			type: 'LineString',
			coordinates: [ /* … */ ]
		}
	},
	product: 'subway' // optional
})
.then((matches) => {
	for (let match of matches) {
		const m = match.movement
		console.log(match.score, m.line.name, m.direction, m.location)
	}
})
.catch((err) => {
	console.error(err)
	process.exitCode = 1
})

If you don't provide the product, it will instead apply its heuristic to all vehicles nearby.

Contributing

If you have a question or have difficulties using hafas-find-trips, please double-check your code and setup first. If you think you have found a bug or want to propose a feature, refer to the issues page.