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// Copyright 2015 The GTFS Specifications Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Protocol definition file for GTFS Realtime. // // GTFS Realtime lets transit agencies provide consumers with realtime // information about disruptions to their service (stations closed, lines not // operating, important delays etc), location of their vehicles and expected // arrival times. // // This protocol is published at: // https://github.com/google/transit/tree/master/gtfs-realtime syntax = "proto2"; package transit_realtime; option java_package = "com.google.transit.realtime"; // The contents of a feed message. // A feed is a continuous stream of feed messages. Each message in the stream is // obtained as a response to an appropriate HTTP GET request. // A realtime feed is always defined with relation to an existing GTFS feed. // All the entity ids are resolved with respect to the GTFS feed. // Note that "required" and "optional" as stated in this file refer to Protocol // Buffer cardinality, not semantic cardinality. See reference.md at // https://github.com/google/transit/tree/master/gtfs-realtime for field // semantic cardinality. message FeedMessage { // Metadata about this feed and feed message. required FeedHeader header = 1; // Contents of the feed. repeated FeedEntity entity = 2; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // Metadata about a feed, included in feed messages. message FeedHeader { // Version of the feed specification. // The current version is 2.0. required string gtfs_realtime_version = 1; // Determines whether the current fetch is incremental. Currently, // DIFFERENTIAL mode is unsupported and behavior is unspecified for feeds // that use this mode. There are discussions on the GTFS Realtime mailing // list around fully specifying the behavior of DIFFERENTIAL mode and the // documentation will be updated when those discussions are finalized. enum Incrementality { FULL_DATASET = 0; DIFFERENTIAL = 1; } optional Incrementality incrementality = 2 [default = FULL_DATASET]; // This timestamp identifies the moment when the content of this feed has been // created (in server time). In POSIX time (i.e., number of seconds since // January 1st 1970 00:00:00 UTC). optional uint64 timestamp = 3; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // A definition (or update) of an entity in the transit feed. message FeedEntity { // The ids are used only to provide incrementality support. The id should be // unique within a FeedMessage. Consequent FeedMessages may contain // FeedEntities with the same id. In case of a DIFFERENTIAL update the new // FeedEntity with some id will replace the old FeedEntity with the same id // (or delete it - see is_deleted below). // The actual GTFS entities (e.g. stations, routes, trips) referenced by the // feed must be specified by explicit selectors (see EntitySelector below for // more info). required string id = 1; // Whether this entity is to be deleted. Relevant only for incremental // fetches. optional bool is_deleted = 2 [default = false]; // Data about the entity itself. Exactly one of the following fields must be // present (unless the entity is being deleted). optional TripUpdate trip_update = 3; optional VehiclePosition vehicle = 4; optional Alert alert = 5; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // // Entities used in the feed. // // Realtime update of the progress of a vehicle along a trip. // Depending on the value of ScheduleRelationship, a TripUpdate can specify: // - A trip that proceeds along the schedule. // - A trip that proceeds along a route but has no fixed schedule. // - A trip that have been added or removed with regard to schedule. // // The updates can be for future, predicted arrival/departure events, or for // past events that already occurred. // Normally, updates should get more precise and more certain (see // uncertainty below) as the events gets closer to current time. // Even if that is not possible, the information for past events should be // precise and certain. In particular, if an update points to time in the past // but its update's uncertainty is not 0, the client should conclude that the // update is a (wrong) prediction and that the trip has not completed yet. // // Note that the update can describe a trip that is already completed. // To this end, it is enough to provide an update for the last stop of the trip. // If the time of that is in the past, the client will conclude from that that // the whole trip is in the past (it is possible, although inconsequential, to // also provide updates for preceding stops). // This option is most relevant for a trip that has completed ahead of schedule, // but according to the schedule, the trip is still proceeding at the current // time. Removing the updates for this trip could make the client assume // that the trip is still proceeding. // Note that the feed provider is allowed, but not required, to purge past // updates - this is one case where this would be practically useful. message TripUpdate { // The Trip that this message applies to. There can be at most one // TripUpdate entity for each actual trip instance. // If there is none, that means there is no prediction information available. // It does *not* mean that the trip is progressing according to schedule. required TripDescriptor trip = 1; // Additional information on the vehicle that is serving this trip. optional VehicleDescriptor vehicle = 3; // 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. message StopTimeEvent { // 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. optional int32 delay = 1; // Event as absolute time. // In Unix time (i.e., number of seconds since January 1st 1970 00:00:00 // UTC). optional int64 time = 2; // 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. optional int32 uncertainty = 3; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features // and modifications to the spec. extensions 1000 to 1999; } // Realtime update for arrival and/or departure events for a given stop on a // trip. Updates can be supplied for both past and future events. // The producer is allowed, although not required, to drop past events. message StopTimeUpdate { // The update is linked to a specific stop either through stop_sequence or // stop_id, so one of the fields below must necessarily be set. // See the documentation in TripDescriptor for more information. // Must be the same as in stop_times.txt in the corresponding GTFS feed. optional uint32 stop_sequence = 1; // Must be the same as in stops.txt in the corresponding GTFS feed. optional string stop_id = 4; optional StopTimeEvent arrival = 2; optional StopTimeEvent departure = 3; // The relation between this StopTime and the static schedule. enum ScheduleRelationship { // The vehicle is proceeding in accordance with its static schedule of // stops, although not necessarily according to the times of the schedule. // At least one of arrival and departure must be provided. If the schedule // for this stop contains both arrival and departure times then so must // this update. SCHEDULED = 0; // The stop is skipped, i.e., the vehicle will not stop at this stop. // Arrival and departure are optional. SKIPPED = 1; // No data is given for this stop. The main intention for this value is to // give the predictions only for part of a trip, i.e., if the last update // for a trip has a NO_DATA specifier, then StopTimes for the rest of the // stops in the trip are considered to be unspecified as well. // Neither arrival nor departure should be supplied. NO_DATA = 2; } optional ScheduleRelationship schedule_relationship = 5 [default = SCHEDULED]; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features // and modifications to the spec. extensions 1000 to 1999; } // Updates to StopTimes for the trip (both future, i.e., predictions, and in // some cases, past ones, i.e., those that already happened). // The updates must be sorted by stop_sequence, and apply for all the // following stops of the trip up to the next specified one. // // Example 1: // For a trip with 20 stops, a StopTimeUpdate with arrival delay and departure // delay of 0 for stop_sequence of the current stop means that the trip is // exactly on time. // // Example 2: // For the same trip instance, 3 StopTimeUpdates are provided: // - delay of 5 min for stop_sequence 3 // - delay of 1 min for stop_sequence 8 // - delay of unspecified duration for stop_sequence 10 // This will be interpreted as: // - stop_sequences 3,4,5,6,7 have delay of 5 min. // - stop_sequences 8,9 have delay of 1 min. // - stop_sequences 10,... have unknown delay. repeated StopTimeUpdate stop_time_update = 2; // Moment at which the vehicle's real-time progress was measured. In POSIX // time (i.e., the number of seconds since January 1st 1970 00:00:00 UTC). optional uint64 timestamp = 4; // The current schedule deviation for the trip. Delay should only be // specified when the prediction is given relative to some existing schedule // in GTFS. // // 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 information in StopTimeUpdates take precedent of trip-level delay // information, such that trip-level delay is only propagated until the next // stop along the trip with a StopTimeUpdate delay value specified. // // Feed providers are strongly encouraged to provide a TripUpdate.timestamp // value indicating when the delay value was last updated, in order to // evaluate the freshness of the data. // // NOTE: This field is still experimental, and subject to change. It may be // formally adopted in the future. optional int32 delay = 5; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // Realtime positioning information for a given vehicle. message VehiclePosition { // The Trip that this vehicle is serving. // Can be empty or partial if the vehicle can not be identified with a given // trip instance. optional TripDescriptor trip = 1; // Additional information on the vehicle that is serving this trip. optional VehicleDescriptor vehicle = 8; // Current position of this vehicle. optional Position position = 2; // The stop sequence index of the current stop. The meaning of // current_stop_sequence (i.e., the stop that it refers to) is determined by // current_status. // If current_status is missing IN_TRANSIT_TO is assumed. optional uint32 current_stop_sequence = 3; // Identifies the current stop. The value must be the same as in stops.txt in // the corresponding GTFS feed. optional string stop_id = 7; enum VehicleStopStatus { // The vehicle is just about to arrive at the stop (on a stop // display, the vehicle symbol typically flashes). INCOMING_AT = 0; // The vehicle is standing at the stop. STOPPED_AT = 1; // The vehicle has departed and is in transit to the next stop. IN_TRANSIT_TO = 2; } // The exact status of the vehicle with respect to the current stop. // Ignored if current_stop_sequence is missing. optional VehicleStopStatus current_status = 4 [default = IN_TRANSIT_TO]; // Moment at which the vehicle's position was measured. In POSIX time // (i.e., number of seconds since January 1st 1970 00:00:00 UTC). optional uint64 timestamp = 5; // Congestion level that is affecting this vehicle. enum CongestionLevel { UNKNOWN_CONGESTION_LEVEL = 0; RUNNING_SMOOTHLY = 1; STOP_AND_GO = 2; CONGESTION = 3; SEVERE_CONGESTION = 4; // People leaving their cars. } optional CongestionLevel congestion_level = 6; // The degree of passenger occupancy of the vehicle. This field is still // experimental, and subject to change. It may be formally adopted in the // future. enum OccupancyStatus { // The vehicle is considered empty by most measures, and has few or no // passengers onboard, but is still accepting passengers. EMPTY = 0; // The vehicle has a relatively large percentage of seats available. // What percentage of free seats out of the total seats available is to be // considered large enough to fall into this category is determined at the // discretion of the producer. MANY_SEATS_AVAILABLE = 1; // The vehicle has a relatively small percentage of seats available. // What percentage of free seats out of the total seats available is to be // considered small enough to fall into this category is determined at the // discretion of the feed producer. FEW_SEATS_AVAILABLE = 2; // The vehicle can currently accommodate only standing passengers. STANDING_ROOM_ONLY = 3; // The vehicle can currently accommodate only standing passengers // and has limited space for them. CRUSHED_STANDING_ROOM_ONLY = 4; // The vehicle is considered full by most measures, but may still be // allowing passengers to board. FULL = 5; // The vehicle is not accepting additional passengers. NOT_ACCEPTING_PASSENGERS = 6; } optional OccupancyStatus occupancy_status = 9; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // An alert, indicating some sort of incident in the public transit network. message Alert { // Time when the alert should be shown to the user. If missing, the // alert will be shown as long as it appears in the feed. // If multiple ranges are given, the alert will be shown during all of them. repeated TimeRange active_period = 1; // Entities whose users we should notify of this alert. repeated EntitySelector informed_entity = 5; // Cause of this alert. enum Cause { UNKNOWN_CAUSE = 1; OTHER_CAUSE = 2; // Not machine-representable. TECHNICAL_PROBLEM = 3; STRIKE = 4; // Public transit agency employees stopped working. DEMONSTRATION = 5; // People are blocking the streets. ACCIDENT = 6; HOLIDAY = 7; WEATHER = 8; MAINTENANCE = 9; CONSTRUCTION = 10; POLICE_ACTIVITY = 11; MEDICAL_EMERGENCY = 12; } optional Cause cause = 6 [default = UNKNOWN_CAUSE]; // What is the effect of this problem on the affected entity. enum Effect { NO_SERVICE = 1; REDUCED_SERVICE = 2; // We don't care about INsignificant delays: they are hard to detect, have // little impact on the user, and would clutter the results as they are too // frequent. SIGNIFICANT_DELAYS = 3; DETOUR = 4; ADDITIONAL_SERVICE = 5; MODIFIED_SERVICE = 6; OTHER_EFFECT = 7; UNKNOWN_EFFECT = 8; STOP_MOVED = 9; } optional Effect effect = 7 [default = UNKNOWN_EFFECT]; // The URL which provides additional information about the alert. optional TranslatedString url = 8; // Alert header. Contains a short summary of the alert text as plain-text. optional TranslatedString header_text = 10; // Full description for the alert as plain-text. The information in the // description should add to the information of the header. optional TranslatedString description_text = 11; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features // and modifications to the spec. extensions 1000 to 1999; } // // Low level data structures used above. // // A time interval. The interval is considered active at time 't' if 't' is // greater than or equal to the start time and less than the end time. message TimeRange { // Start time, in POSIX time (i.e., number of seconds since January 1st 1970 // 00:00:00 UTC). // If missing, the interval starts at minus infinity. optional uint64 start = 1; // End time, in POSIX time (i.e., number of seconds since January 1st 1970 // 00:00:00 UTC). // If missing, the interval ends at plus infinity. optional uint64 end = 2; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // A position. message Position { // Degrees North, in the WGS-84 coordinate system. required float latitude = 1; // Degrees East, in the WGS-84 coordinate system. required float longitude = 2; // Bearing, in degrees, clockwise from North, i.e., 0 is North and 90 is East. // This can be the compass bearing, or the direction towards the next stop // or intermediate location. // This should not be direction deduced from the sequence of previous // positions, which can be computed from previous data. optional float bearing = 3; // Odometer value, in meters. optional double odometer = 4; // Momentary speed measured by the vehicle, in meters per second. optional float speed = 5; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // A descriptor that identifies an instance of a GTFS trip, or all instances of // a trip along a route. // - To specify a single trip instance, the trip_id (and if necessary, // start_time) is set. If route_id is also set, then it should be same as one // that the given trip corresponds to. // - To specify all the trips along a given route, only the route_id should be // set. Note that if the trip_id is not known, then stop sequence ids in // TripUpdate are not sufficient, and stop_ids must be provided as well. In // addition, absolute arrival/departure times must be provided. message TripDescriptor { // The trip_id from the GTFS feed that this selector refers to. // For non frequency-based trips, this field is enough to uniquely identify // the trip. For frequency-based trip, start_time and start_date might also be // necessary. optional string trip_id = 1; // The route_id from the GTFS that this selector refers to. optional string route_id = 5; // The direction_id from the GTFS feed trips.txt file, indicating the // direction of travel for trips this selector refers to. This field is // still experimental, and subject to change. It may be formally adopted in // the future. optional uint32 direction_id = 6; // The initially scheduled start time of this trip instance. // When the trip_id corresponds to a non-frequency-based trip, this field // should either be omitted or be equal to the value in the GTFS feed. When // the trip_id corresponds to a frequency-based trip, the start_time must be // specified for trip updates and vehicle positions. If the trip corresponds // to exact_times=1 GTFS record, then start_time must be some multiple // (including zero) of headway_secs later than frequencies.txt start_time for // the corresponding time period. If the trip corresponds to exact_times=0, // then its start_time may be arbitrary, and is initially expected to be the // first departure of the trip. Once established, the start_time of this // frequency-based trip should be considered immutable, even if the first // departure time changes -- that time change may instead be reflected in a // StopTimeUpdate. // Format and semantics of the field is same as that of // GTFS/frequencies.txt/start_time, e.g., 11:15:35 or 25:15:35. optional string start_time = 2; // The scheduled start date of this trip instance. // Must be provided to disambiguate trips that are so late as to collide with // a scheduled trip on a next day. For example, for a train that departs 8:00 // and 20:00 every day, and is 12 hours late, there would be two distinct // trips on the same time. // This field can be provided but is not mandatory for schedules in which such // collisions are impossible - for example, a service running on hourly // schedule where a vehicle that is one hour late is not considered to be // related to schedule anymore. // In YYYYMMDD format. optional string start_date = 3; // The relation between this trip and the static schedule. If a trip is done // in accordance with temporary schedule, not reflected in GTFS, then it // shouldn't be marked as SCHEDULED, but likely as ADDED. enum ScheduleRelationship { // Trip that is running in accordance with its GTFS schedule, or is close // enough to the scheduled trip to be associated with it. SCHEDULED = 0; // An extra trip that was added in addition to a running schedule, for // example, to replace a broken vehicle or to respond to sudden passenger // load. ADDED = 1; // A trip that is running with no schedule associated to it, for example, if // there is no schedule at all. UNSCHEDULED = 2; // A trip that existed in the schedule but was removed. CANCELED = 3; } optional ScheduleRelationship schedule_relationship = 4; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // Identification information for the vehicle performing the trip. message VehicleDescriptor { // Internal system identification of the vehicle. Should be unique per // vehicle, and can be used for tracking the vehicle as it proceeds through // the system. optional string id = 1; // User visible label, i.e., something that must be shown to the passenger to // help identify the correct vehicle. optional string label = 2; // The license plate of the vehicle. optional string license_plate = 3; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // A selector for an entity in a GTFS feed. message EntitySelector { // The values of the fields should correspond to the appropriate fields in the // GTFS feed. // At least one specifier must be given. If several are given, then the // matching has to apply to all the given specifiers. optional string agency_id = 1; optional string route_id = 2; // corresponds to route_type in GTFS. optional int32 route_type = 3; optional TripDescriptor trip = 4; optional string stop_id = 5; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // An internationalized message containing per-language versions of a snippet of // text or a URL. // One of the strings from a message will be picked up. The resolution proceeds // as follows: // 1. If the UI language matches the language code of a translation, // the first matching translation is picked. // 2. If a default UI language (e.g., English) matches the language code of a // translation, the first matching translation is picked. // 3. If some translation has an unspecified language code, that translation is // picked. message TranslatedString { message Translation { // A UTF-8 string containing the message. required string text = 1; // BCP-47 language code. Can be omitted if the language is unknown or if // no i18n is done at all for the feed. At most one translation is // allowed to have an unspecified language tag. optional string language = 2; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; } // At least one translation must be provided. repeated Translation translation = 1; // The extensions namespace allows 3rd-party developers to extend the // GTFS Realtime Specification in order to add and evaluate new features and // modifications to the spec. extensions 1000 to 1999; }