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Drew Baden

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Jul 7, 2024, 5:34:07 PM7/7/24

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Greetings. I'm a newbie trying to learn to make an iPhone App to display bus data, using the OneBusAway API.

I first load the routes for my agency (Seattle) using the URL:

https://api.pugetsound.onebusaway.org/api/where/routes-for-agency/1.json?key=

Works fine. Then I click on a route and load the data for that route using:

https://api.pugetsound.onebusaway.org/api/where/schedule-for-route/<routeId>.json?key=

Works fine as well. I can dig out all of the stops and static arrival and departure times for stops along a particular direction.

Then, I take a particular stop id and load real-time data using:

https://api.pugetsound.onebusaway.org/api/where/arrivals-and-departures-for-stop/<stop_id>.json?key=

That also works fine. From the documentation:

https://developer.onebusaway.org/api/where/methods/arrivals-and-departures-for-stop

it says that I can get the real-time info for the route, and in particular the scheduledArrivalTime and scheduledDepartureTime in ms since unix epoch.

My question is this: when I compare the scheduledArrivalTime (scheduledDepartureTime is usually the same value) to what I get when I load the route, I get different answers. The times are not the same. Sometimes they are off by 10 minutes, which is curious.

I guess what my question really is is this: from those who've done something similar already (in javascript or Swift), what's the best method for doing this?

Thanks! Sorry if this is a dumb question that has been answered before.

Drew

Aaron Brethorst

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Jul 7, 2024, 5:45:51 PM7/7/24

to onebusaway-developers

Hey Drew - Not that I doubt your findings, but I can't say that I've noticed this discrepancy before. Can you give me an example of two API calls I can compare to see this first-hand?

Also, out of curiosity, is there any reason you're building all of this lower-level API functionality from scratch? You should be able to reuse the OBAKitCore framework from https://github.com/onebusaway/onebusaway-ios, which includes both a well tested networking stack and models. I'm happy to help you get it incorporated into your app if that ends up being a challenge. (I haven't gotten around to turning it into a Swift Package yet, unfortunately.)

cheers,

Aaron

Baden Drew

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Jul 8, 2024, 1:16:03 AM7/8/24

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Thanks, but now I have another problem that precludes me from solving the first one!

When I issue this command:

https://api.pugetsound.onebusaway.org/api/where/arrivals-and-departures-for-stop/1_75407.json?key=…

I get a json object that I decode, and I look at the arrivalsAndDepartures section. It contains 2 blocks, both have numberOfStopsAway = 9, both have predicted = false, consistent with both having 0 for predictedDeparture/ArrivalTime. And both have the closest stop at id 1_18085, which is the first stop on the 44 bus route incoming.

Here’s the json object, for what it's worth.

Also, under data there’s “entry” and “references”, but I don’t see any documentation on “references” when I look here:

https://developer.onebusaway.org/api/where/methods/arrivals-and-departures-for-stop

Thanks for your help!!!

Drew

PS. Yes, I’m not using OBAKitCore because I am a newbie iOS app developer and haven’t gotten to the point where I can plug such a thing in, so I decided to see if I can understand things from the documentation itself as a starter. But I will look into it.

{

"code" : 200,

"data" : {

"entry" : {

"arrivalsAndDepartures" : [

{

"numberOfStopsAway" : 9,

"predictedDepartureInterval" : null,

"lastUpdateTime" : 0,

"predictedDepartureTime" : 0,

"routeShortName" : "44",

"scheduledDepartureTime" : 1720415314000,

"situationIds" : [

"predictedOccupancy" : "",

"serviceDate" : 1720335600000,

"predictedArrivalTime" : 0,

"vehicleId" : "",

"frequency" : null,

"tripStatus" : {

"occupancyCapacity" : -1,

"occupancyCount" : -1,

"position" : {

"lat" : 47.667934000654007,

"lon" : -122.398323

"lastKnownOrientation" : 0,

"status" : "default",

"lastKnownDistanceAlongTrip" : 0,

"nextStopTimeOffset" : 3,

"occupancyStatus" : "",

"closestStop" : "1_18085",

"totalDistanceAlongTrip" : 8720.2389357926986,

"vehicleId" : "",

"closestStopTimeOffset" : 3,

"lastUpdateTime" : 0,

"phase" : "",

"nextStop" : "1_18085",

"predicted" : false,

"scheduleDeviation" : 0,

"scheduledDistanceAlongTrip" : 8720.2388630707283,

"vehicleFeatures" : [

"orientation" : 270,

"lastLocationUpdateTime" : 0,

"blockTripSequence" : 3,

"activeTripId" : "1_629475226",

"frequency" : null,

"serviceDate" : 1720335600000,

"distanceAlongTrip" : 0,

"situationIds" : [

]

"scheduledArrivalInterval" : null,

"arrivalEnabled" : true,

"tripId" : "1_562591026",

"blockTripSequence" : 4,

"routeLongName" : "",

"historicalOccupancy" : "",

"scheduledArrivalTime" : 1720415314000,

"status" : "default",

"scheduledTrack" : "",

"occupancyStatus" : "",

"actualTrack" : "",

"stopSequence" : 9,

"tripHeadsign" : "University Of Washington Medical Center Wallingford",

"predicted" : false,

"scheduledDepartureInterval" : null,

"stopId" : "1_75407",

"distanceFromStop" : 2979.4030910503388,

"departureEnabled" : true,

"predictedArrivalInterval" : null,

"routeId" : "1_100224",

"totalStopsInTrip" : 27

{

"numberOfStopsAway" : 9,

"predictedDepartureInterval" : null,

"lastUpdateTime" : 0,

"predictedDepartureTime" : 0,

"routeShortName" : "44",

"scheduledDepartureTime" : 1720416454000,

"situationIds" : [

"predictedOccupancy" : "",

"serviceDate" : 1720335600000,

"predictedArrivalTime" : 0,

"vehicleId" : "",

"frequency" : null,

"tripStatus" : {

"occupancyCapacity" : -1,

"occupancyCount" : -1,

"position" : {

"lat" : 47.667934252168607,

"lon" : -122.398323

"lastKnownOrientation" : 0,

"status" : "default",

"lastKnownDistanceAlongTrip" : 0,

"nextStopTimeOffset" : 1203,

"occupancyStatus" : "",

"closestStop" : "1_18085",

"totalDistanceAlongTrip" : 8720.2389357926986,

"vehicleId" : "",

"closestStopTimeOffset" : -357,

"lastUpdateTime" : 0,

"phase" : "",

"nextStop" : "1_18085",

"predicted" : false,

"scheduleDeviation" : 0,

"scheduledDistanceAlongTrip" : 8720.2108958796307,

"vehicleFeatures" : [

"orientation" : 270,

"lastLocationUpdateTime" : 0,

"blockTripSequence" : 11,

"activeTripId" : "1_562590346",

"frequency" : null,

"serviceDate" : 1720335600000,

"distanceAlongTrip" : 0,

"situationIds" : [

]

"scheduledArrivalInterval" : null,

"arrivalEnabled" : true,

"tripId" : "1_562591186",

"blockTripSequence" : 12,

"routeLongName" : "",

"historicalOccupancy" : "",

"scheduledArrivalTime" : 1720416454000,

"status" : "default",

"scheduledTrack" : "",

"occupancyStatus" : "",

"actualTrack" : "",

"stopSequence" : 9,

"tripHeadsign" : "University Of Washington Medical Center Wallingford",

"predicted" : false,

"scheduledDepartureInterval" : null,

"stopId" : "1_75407",

"distanceFromStop" : 2979.4310582414473,

"departureEnabled" : true,

"predictedArrivalInterval" : null,

"routeId" : "1_100224",

"totalStopsInTrip" : 27

}

"nearbyStopIds" : [

"1_29640"

"stopId" : "1_75407",

"situationIds" : [

]

"references" : {

"stops" : [

{

"parent" : "",

"id" : "1_75407",

"code" : "75407",

"locationType" : 0,

"lon" : -122.361046,

"routeIds" : [

"1_100224"

"staticRouteIds" : [

"1_100224"

"direction" : "SE",

"lat" : 47.667099,

"name" : "NW Market St & 3rd Ave NW",

"wheelchairBoarding" : "ACCESSIBLE"

{

"parent" : "",

"id" : "1_18085",

"code" : "18085",

"locationType" : 0,

"lon" : -122.398415,

"routeIds" : [

"1_100224"

"staticRouteIds" : [

"1_100224"

"direction" : "S",

"lat" : 47.667934000000002,

"name" : "32nd Ave NW & NW Market St",

"wheelchairBoarding" : "ACCESSIBLE"

{

"parent" : "",

"id" : "1_29640",

"code" : "29640",

"locationType" : 0,

"lon" : -122.361328,

"routeIds" : [

"1_100224"

"staticRouteIds" : [

"1_100224"

"direction" : "NW",

"lat" : 47.667763000000001,

"name" : "NW Market St & 3rd Ave NW",

"wheelchairBoarding" : "ACCESSIBLE"

}

"trips" : [

{

"routeId" : "1_100224",

"blockId" : "1_7253369",

"timeZone" : "",

"id" : "1_562591026",

"tripShortName" : "",

"serviceId" : "1_11248",

"shapeId" : "1_20044006",

"directionId" : "1",

"peakOffpeak" : 0,

"routeShortName" : "",

"tripHeadsign" : "University Of Washington Medical Center Wallingford"

{

"routeId" : "1_100224",

"blockId" : "1_7253369",

"timeZone" : "",

"id" : "1_629475226",

"tripShortName" : "",

"serviceId" : "1_11248",

"shapeId" : "1_11044004",

"directionId" : "0",

"peakOffpeak" : 0,

"routeShortName" : "",

"tripHeadsign" : "Ballard Wallingford"

{

"routeId" : "1_100224",

"blockId" : "1_7253368",

"timeZone" : "",

"id" : "1_562591186",

"tripShortName" : "",

"serviceId" : "1_11248",

"shapeId" : "1_20044006",

"directionId" : "1",

"peakOffpeak" : 0,

"routeShortName" : "",

"tripHeadsign" : "University Of Washington Medical Center Wallingford"

{

"routeId" : "1_100224",

"blockId" : "1_7253368",

"timeZone" : "",

"id" : "1_562590346",

"tripShortName" : "",

"serviceId" : "1_11248",

"shapeId" : "1_11044004",

"directionId" : "0",

"peakOffpeak" : 0,

"routeShortName" : "",

"tripHeadsign" : "Ballard Wallingford"

}

"situations" : [

"stopTimes" : [

"routes" : [

{

"url" : "https:\/\/kingcounty.gov\/en\/dept\/metro\/routes-and-service\/schedules-and-maps\/044.html",

"agencyId" : "1",

"color" : "",

"id" : "1_100224",

"longName" : "",

"shortName" : "44",

"description" : "Ballard - Montlake",

"nullSafeShortName" : "44",

"textColor" : "",

"type" : 3

}

"agencies" : [

{

"phone" : "206-553-3000",

"url" : "https:\/\/kingcounty.gov\/en\/dept\/metro",

"lang" : "EN",

"id" : "1",

"disclaimer" : "",

"timezone" : "America\/Los_Angeles",

"email" : "",

"fareUrl" : "https:\/\/kingcounty.gov\/en\/dept\/metro\/fares-and-payment\/prices",

"name" : "Metro Transit",

"privateService" : false

}

]

}

"text" : "OK",

"version" : 2,

"currentTime" : 1720414797520

}

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