s2-tools
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A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.
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JavaScript
/**
* Timing information for a single predicted event (either arrival or
* departure).
* Timing consists of delay and/or estimated time, and uncertainty.
* - delay should be used when the prediction is given relative to some
* existing schedule in GTFS.
* - time should be given whether there is a predicted schedule or not. If
* both time and delay are specified, time will take precedence
* (although normally, time, if given for a scheduled trip, should be
* equal to scheduled time in GTFS + delay).
*
* Uncertainty applies equally to both time and delay.
* The uncertainty roughly specifies the expected error in true delay (but
* note, we don't yet define its precise statistical meaning). It's possible
* for the uncertainty to be 0, for example for trains that are driven under
* computer timing control.
*/
export class GTFSRealtimeStopTimeEvent {
/**
* Delay (in seconds) can be positive (meaning that the vehicle is late) or
* negative (meaning that the vehicle is ahead of schedule). Delay of 0
* means that the vehicle is exactly on time.
*/
delay; // 1 [int32]
/**
* Event as absolute time.
* In Unix time (i.e., number of seconds since January 1st 1970 00:00:00
* UTC).
*/
time; // 2 [int64]
/**
* If uncertainty is omitted, it is interpreted as unknown.
* If the prediction is unknown or too uncertain, the delay (or time) field
* should be empty. In such case, the uncertainty field is ignored.
* To specify a completely certain prediction, set its uncertainty to 0.
*/
uncertainty; // 3 [int32]
/**
* @param pbf - The Protobuf object to read from
* @param end - The end position of the message in the buffer
*/
constructor(pbf, end) {
pbf.readFields(this.#readstopTimeUpdate, this, end);
}
/**
* @param tag - The tag of the message
* @param stopTimeEvent - The stopTimeEvent to mutate
* @param pbf - The Protobuf object to read from
*/
#readstopTimeUpdate(tag, stopTimeEvent, pbf) {
if (tag === 1)
stopTimeEvent.delay = pbf.readSVarint();
else if (tag === 2)
stopTimeEvent.time = pbf.readSVarint();
else if (tag === 3)
stopTimeEvent.uncertainty = pbf.readSVarint();
else
throw new Error('unknown tag ' + tag);
}
}
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