Protobuf - General Transit Feed Specification

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The contents of the file are shown inline below. For more information about using protobufs, see the <a href="https://developers.google.com/protocol-buffers/docs/overview" target="_blank" rel="noopener">Protocol Buffers Developer Guide</a>. <div class="highlight"><pre><code>// 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"; option java_package = "com.google.transit.realtime"; package 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Metadata about a feed, included in feed messages. message FeedHeader { // Version of the feed specification. // The current version is 2.0. Valid versions are "2.0", "1.0". 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional Shape shape = 6; optional Stop stop = 7; optional TripModifications trip_modifications = 8; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // Expected occupancy after departure from the given stop. // Should be provided only for future stops. // In order to provide departure_occupancy_status without either arrival or // departure StopTimeEvents, ScheduleRelationship should be set to NO_DATA. optional VehiclePosition.OccupancyStatus departure_occupancy_status = 7; // The relation between the StopTimeEvents 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. Frequency-based trips (GTFS frequencies.txt with exact_times = 0) // should not have a SCHEDULED value and should use UNSCHEDULED instead. SCHEDULED = 0; // The stop is skipped, i.e., the vehicle will not stop at this stop. // Arrival and departure are optional. SKIPPED = 1; // No StopTimeEvents are given for this stop. // The main intention for this value is to give time predictions only for // part of a trip, i.e., if the last update for a trip has a NO_DATA // specifier, then StopTimeEvents 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; // The vehicle is operating a trip defined in GTFS frequencies.txt with exact_times = 0. // This value should not be used for trips that are not defined in GTFS frequencies.txt, // or trips in GTFS frequencies.txt with exact_times = 1. Trips containing StopTimeUpdates // with ScheduleRelationship=UNSCHEDULED must also set TripDescriptor.ScheduleRelationship=UNSCHEDULED. // NOTE: This field is still experimental, and subject to change. It may be // formally adopted in the future. UNSCHEDULED = 3; } optional ScheduleRelationship schedule_relationship = 5 [default = SCHEDULED]; // Provides the updated values for the stop time. // NOTE: This message is still experimental, and subject to change. It may be formally adopted in the future. message StopTimeProperties { // Supports real-time stop assignments. Refers to a stop_id defined in the GTFS stops.txt. // The new assigned_stop_id should not result in a significantly different trip experience for the end user than // the stop_id defined in GTFS stop_times.txt. In other words, the end user should not view this new stop_id as an // "unusual change" if the new stop was presented within an app without any additional context. // For example, this field is intended to be used for platform assignments by using a stop_id that belongs to the // same station as the stop originally defined in GTFS stop_times.txt. // To assign a stop without providing any real-time arrival or departure predictions, populate this field and set // StopTimeUpdate.schedule_relationship = NO_DATA. // If this field is populated, it is preferred to omit `StopTimeUpdate.stop_id` and use only `StopTimeUpdate.stop_sequence`. If // `StopTimeProperties.assigned_stop_id` and `StopTimeUpdate.stop_id` are populated, `StopTimeUpdate.stop_id` must match `assigned_stop_id`. // Platform assignments should be reflected in other GTFS-realtime fields as well // (e.g., `VehiclePosition.stop_id`). // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string assigned_stop_id = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Realtime updates for certain properties defined within GTFS stop_times.txt // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional StopTimeProperties stop_time_properties = 6; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // The most recent moment at which the vehicle's real-time progress was measured // to estimate StopTimes in the future. When StopTimes in the past are provided, // arrival/departure times may be earlier than this value. 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; // Defines updated properties of the trip, such as a new shape_id when there is a detour. Or defines the // trip_id, start_date, and start_time of a DUPLICATED trip. // NOTE: This message is still experimental, and subject to change. It may be formally adopted in the future. message TripProperties { // Defines the identifier of a new trip that is a duplicate of an existing trip defined in (CSV) GTFS trips.txt // but will start at a different service date and/or time (defined using the TripProperties.start_date and // TripProperties.start_time fields). See definition of trips.trip_id in (CSV) GTFS. Its value must be different // than the ones used in the (CSV) GTFS. Required if schedule_relationship=DUPLICATED, otherwise this field must not // be populated and will be ignored by consumers. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string trip_id = 1; // Service date on which the DUPLICATED trip will be run, in YYYYMMDD format. Required if // schedule_relationship=DUPLICATED, otherwise this field must not be populated and will be ignored by consumers. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string start_date = 2; // Defines the departure start time of the trip when it’s duplicated. See definition of stop_times.departure_time // in (CSV) GTFS. Scheduled arrival and departure times for the duplicated trip are calculated based on the offset // between the original trip departure_time and this field. For example, if a GTFS trip has stop A with a // departure_time of 10:00:00 and stop B with departure_time of 10:01:00, and this field is populated with the value // of 10:30:00, stop B on the duplicated trip will have a scheduled departure_time of 10:31:00. Real-time prediction // delay values are applied to this calculated schedule time to determine the predicted time. For example, if a // departure delay of 30 is provided for stop B, then the predicted departure time is 10:31:30. Real-time // prediction time values do not have any offset applied to them and indicate the predicted time as provided. // For example, if a departure time representing 10:31:30 is provided for stop B, then the predicted departure time // is 10:31:30. This field is required if schedule_relationship is DUPLICATED, otherwise this field must not be // populated and will be ignored by consumers. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string start_time = 3; // Specifies the shape of the vehicle travel path when the trip shape differs from the shape specified in // (CSV) GTFS or to specify it in real-time when it's not provided by (CSV) GTFS, such as a vehicle that takes differing // paths based on rider demand. See definition of trips.shape_id in (CSV) GTFS. If a shape is neither defined in (CSV) GTFS // nor in real-time, the shape is considered unknown. This field can refer to a shape defined in the (CSV) GTFS in shapes.txt // or a Shape in the (protobuf) real-time feed. The order of stops (stop sequences) for this trip must remain the same as // (CSV) GTFS. Stops that are a part of the original trip but will no longer be made, such as when a detour occurs, should // be marked as schedule_relationship=SKIPPED. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string shape_id = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } optional TripProperties trip_properties = 6; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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 state of passenger occupancy for the vehicle or carriage. // Individual producers may not publish all OccupancyStatus values. Therefore, consumers // must not assume that the OccupancyStatus values follow a linear scale. // Consumers should represent OccupancyStatus values as the state indicated // and intended by the producer. Likewise, producers must use OccupancyStatus values that // correspond to actual vehicle occupancy states. // For describing passenger occupancy levels on a linear scale, see `occupancy_percentage`. // This field is still experimental, and subject to change. It may be formally adopted in the future. enum OccupancyStatus { // The vehicle or carriage is considered empty by most measures, and has few or no // passengers onboard, but is still accepting passengers. EMPTY = 0; // The vehicle or carriage has a large number of seats available. // The amount of free seats out of the total seats available to be // considered large enough to fall into this category is determined at the // discretion of the producer. MANY_SEATS_AVAILABLE = 1; // The vehicle or carriage has a relatively small number of seats available. // The amount of free seats out of the total seats available 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 or carriage can currently accommodate only standing passengers. STANDING_ROOM_ONLY = 3; // The vehicle or carriage can currently accommodate only standing passengers // and has limited space for them. CRUSHED_STANDING_ROOM_ONLY = 4; // The vehicle or carriage is considered full by most measures, but may still be // allowing passengers to board. FULL = 5; // The vehicle or carriage is not accepting passengers, but usually accepts passengers for boarding. NOT_ACCEPTING_PASSENGERS = 6; // The vehicle or carriage doesn't have any occupancy data available at that time. NO_DATA_AVAILABLE = 7; // The vehicle or carriage is not boardable and never accepts passengers. // Useful for special vehicles or carriages (engine, maintenance carriage, etc…). NOT_BOARDABLE = 8; } // If multi_carriage_status is populated with per-carriage OccupancyStatus, // then this field should describe the entire vehicle with all carriages accepting passengers considered. optional OccupancyStatus occupancy_status = 9; // A percentage value indicating the degree of passenger occupancy in the vehicle. // The values are represented as an integer without decimals. 0 means 0% and 100 means 100%. // The value 100 should represent the total maximum occupancy the vehicle was designed for, // including both seated and standing capacity, and current operating regulations allow. // The value may exceed 100 if there are more passengers than the maximum designed capacity. // The precision of occupancy_percentage should be low enough that individual passengers cannot be tracked boarding or alighting the vehicle. // If multi_carriage_status is populated with per-carriage occupancy_percentage, // then this field should describe the entire vehicle with all carriages accepting passengers considered. // This field is still experimental, and subject to change. It may be formally adopted in the future. optional uint32 occupancy_percentage = 10; // Carriage specific details, used for vehicles composed of several carriages // This message/field is still experimental, and subject to change. It may be formally adopted in the future. message CarriageDetails { // Identification of the carriage. Should be unique per vehicle. optional string id = 1; // User visible label that may be shown to the passenger to help identify // the carriage. Example: "7712", "Car ABC-32", etc... // This message/field is still experimental, and subject to change. It may be formally adopted in the future. optional string label = 2; // Occupancy status for this given carriage, in this vehicle // This message/field is still experimental, and subject to change. It may be formally adopted in the future. optional OccupancyStatus occupancy_status = 3 [default = NO_DATA_AVAILABLE]; // Occupancy percentage for this given carriage, in this vehicle. // Follows the same rules as "VehiclePosition.occupancy_percentage" // -1 in case data is not available for this given carriage (as protobuf defaults to 0 otherwise) // This message/field is still experimental, and subject to change. It may be formally adopted in the future. optional int32 occupancy_percentage = 4 [default = -1]; // Identifies the order of this carriage with respect to the other // carriages in the vehicle's list of CarriageDetails. // The first carriage in the direction of travel must have a value of 1. // The second value corresponds to the second carriage in the direction // of travel and must have a value of 2, and so forth. // For example, the first carriage in the direction of travel has a value of 1. // If the second carriage in the direction of travel has a value of 3, // consumers will discard data for all carriages (i.e., the multi_carriage_details field). // Carriages without data must be represented with a valid carriage_sequence number and the fields // without data should be omitted (alternately, those fields could also be included and set to the "no data" values). // This message/field is still experimental, and subject to change. It may be formally adopted in the future. optional uint32 carriage_sequence = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Details of the multiple carriages of this given vehicle. // The first occurrence represents the first carriage of the vehicle, // given the current direction of travel. // The number of occurrences of the multi_carriage_details // field represents the number of carriages of the vehicle. // It also includes non boardable carriages, // like engines, maintenance carriages, etc… as they provide valuable // information to passengers about where to stand on a platform. // This message/field is still experimental, and subject to change. It may be formally adopted in the future. repeated CarriageDetails multi_carriage_details = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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. If cause_detail is included, then Cause must also be included. 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. If effect_detail is included, then Effect must also be included. 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; NO_EFFECT = 10; ACCESSIBILITY_ISSUE = 11; } 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; // Text for alert header to be used in text-to-speech implementations. This field is the text-to-speech version of header_text. optional TranslatedString tts_header_text = 12; // Text for full description for the alert to be used in text-to-speech implementations. This field is the text-to-speech version of description_text. optional TranslatedString tts_description_text = 13; // Severity of this alert. enum SeverityLevel { UNKNOWN_SEVERITY = 1; INFO = 2; WARNING = 3; SEVERE = 4; } optional SeverityLevel severity_level = 14 [default = UNKNOWN_SEVERITY]; // TranslatedImage to be displayed along the alert text. Used to explain visually the alert effect of a detour, station closure, etc. The image must enhance the understanding of the alert. Any essential information communicated within the image must also be contained in the alert text. // The following types of images are discouraged : image containing mainly text, marketing or branded images that add no additional information. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional TranslatedImage image = 15; // Text describing the appearance of the linked image in the `image` field (e.g., in case the image can't be displayed // or the user can't see the image for accessibility reasons). See the HTML spec for alt image text - https://html.spec.whatwg.org/#alt. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional TranslatedString image_alternative_text = 16; // Description of the cause of the alert that allows for agency-specific language; more specific than the Cause. If cause_detail is included, then Cause must also be included. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional TranslatedString cause_detail = 17; // Description of the effect of the alert that allows for agency-specific language; more specific than the Effect. If effect_detail is included, then Effect must also be included. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional TranslatedString effect_detail = 18; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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. When schedule_relationship is DUPLICATED within a TripUpdate, the trip_id identifies the trip from // static GTFS to be duplicated. When schedule_relationship is DUPLICATED within a VehiclePosition, the trip_id // identifies the new duplicate trip and must contain the value for the corresponding TripUpdate.TripProperties.trip_id. 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. 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 correponds 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. // NOTE: Currently, behavior is unspecified for feeds that use this mode. There are discussions on the GTFS GitHub // [(1)](https://github.com/google/transit/issues/106) [(2)](https://github.com/google/transit/pull/221) // [(3)](https://github.com/google/transit/pull/219) around fully specifying or deprecating ADDED trips and the // documentation will be updated when those discussions are finalized. ADDED = 1; // A trip that is running with no schedule associated to it (GTFS frequencies.txt exact_times=0). // Trips with ScheduleRelationship=UNSCHEDULED must also set all StopTimeUpdates.ScheduleRelationship=UNSCHEDULED. UNSCHEDULED = 2; // A trip that existed in the schedule but was removed. CANCELED = 3; // Should not be used - for backwards-compatibility only. REPLACEMENT = 5 [deprecated = true]; // 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. Used with TripUpdate.TripProperties.trip_id, TripUpdate.TripProperties.start_date, // and TripUpdate.TripProperties.start_time to copy an existing trip from static GTFS but start at a different service // date and/or time. Duplicating a trip is allowed if the service related to the original trip in (CSV) GTFS // (in calendar.txt or calendar_dates.txt) is operating within the next 30 days. The trip to be duplicated is // identified via TripUpdate.TripDescriptor.trip_id. This enumeration does not modify the existing trip referenced by // TripUpdate.TripDescriptor.trip_id - if a producer wants to cancel the original trip, it must publish a separate // TripUpdate with the value of CANCELED or DELETED. Trips defined in GTFS frequencies.txt with exact_times that is // empty or equal to 0 cannot be duplicated. The VehiclePosition.TripDescriptor.trip_id for the new trip must contain // the matching value from TripUpdate.TripProperties.trip_id and VehiclePosition.TripDescriptor.ScheduleRelationship // must also be set to DUPLICATED. // Existing producers and consumers that were using the ADDED enumeration to represent duplicated trips must follow // the migration guide (https://github.com/google/transit/tree/master/gtfs-realtime/spec/en/examples/migration-duplicated.md) // to transition to the DUPLICATED enumeration. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. DUPLICATED = 6; // A trip that existed in the schedule but was removed and must not be shown to users. // DELETED should be used instead of CANCELED to indicate that a transit provider would like to entirely remove // information about the corresponding trip from consuming applications, so the trip is not shown as cancelled to // riders, e.g. a trip that is entirely being replaced by another trip. // This designation becomes particularly important if several trips are cancelled and replaced with substitute service. // If consumers were to show explicit information about the cancellations it would distract from the more important // real-time predictions. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. DELETED = 7; } optional ScheduleRelationship schedule_relationship = 4; message ModifiedTripSelector { // The 'id' from the FeedEntity in which the contained TripModifications object affects this trip. optional string modifications_id = 1; // The trip_id from the GTFS feed that is modified by the modifications_id optional string affected_trip_id = 2; // The initially scheduled start time of this trip instance, applied to the frequency based modified trip. Same definition as start_time in TripDescriptor. optional string start_time = 3; // The start date of this trip instance in YYYYMMDD format, applied to the modified trip. Same definition as start_date in TripDescriptor. optional string start_date = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Linkage to any modifications done to this trip (shape changes, removal or addition of stops). // If this field is provided, the `trip_id`, `route_id`, `direction_id`, `start_time`, `start_date` fields of the `TripDescriptor` MUST be left empty, to avoid confusion by consumers that aren't looking for the `ModifiedTripSelector` value. optional ModifiedTripSelector modified_trip = 7; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; enum WheelchairAccessible { // The trip doesn't have information about wheelchair accessibility. // This is the **default** behavior. If the static GTFS contains a // _wheelchair_accessible_ value, it won't be overwritten. NO_VALUE = 0; // The trip has no accessibility value present. // This value will overwrite the value from the GTFS. UNKNOWN = 1; // The trip is wheelchair accessible. // This value will overwrite the value from the GTFS. WHEELCHAIR_ACCESSIBLE = 2; // The trip is **not** wheelchair accessible. // This value will overwrite the value from the GTFS. WHEELCHAIR_INACCESSIBLE = 3; } optional WheelchairAccessible wheelchair_accessible = 4 [default = NO_VALUE]; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // Corresponds to trip direction_id in GTFS trips.txt. If provided the // route_id must also be provided. optional uint32 direction_id = 6; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // An internationalized image containing per-language versions of a URL linking to an image // along with meta information // Only one of the images from a message will be retained by consumers. 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. // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. message TranslatedImage { message LocalizedImage { // String containing an URL linking to an image // The image linked must be less than 2MB. // If an image changes in a significant enough way that an update is required on the consumer side, the producer must update the URL to a new one. // The URL should be a fully qualified URL that includes http:// or https://, and any special characters in the URL must be correctly escaped. See the following http://www.w3.org/Addressing/URL/4_URI_Recommentations.html for a description of how to create fully qualified URL values. required string url = 1; // IANA media type as to specify the type of image to be displayed. // The type must start with "image/" required string media_type = 2; // 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 = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // At least one localized image must be provided. repeated LocalizedImage localized_image = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Describes the physical path that a vehicle takes when it's not part of the (CSV) GTFS, // such as for a detour. Shapes belong to Trips, and consist of a sequence of shape points. // Tracing the points in order provides the path of the vehicle. Shapes do not need to intercept // the location of Stops exactly, but all Stops on a trip should lie within a small distance of // the shape for that trip, i.e. close to straight line segments connecting the shape points // NOTE: This message is still experimental, and subject to change. It may be formally adopted in the future. message Shape { // Identifier of the shape. Must be different than any shape_id defined in the (CSV) GTFS. // This field is required as per reference.md, but needs to be specified here optional because "Required is Forever" // See https://developers.google.com/protocol-buffers/docs/proto#specifying_field_rules // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string shape_id = 1; // Encoded polyline representation of the shape. This polyline must contain at least two points. // For more information about encoded polylines, see https://developers.google.com/maps/documentation/utilities/polylinealgorithm // This field is required as per reference.md, but needs to be specified here optional because "Required is Forever" // See https://developers.google.com/protocol-buffers/docs/proto#specifying_field_rules // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. optional string encoded_polyline = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // Describes a stop which is served by trips. All fields are as described in the GTFS-Static specification. // NOTE: This message is still experimental, and subject to change. It may be formally adopted in the future. message Stop { enum WheelchairBoarding { UNKNOWN = 0; AVAILABLE = 1; NOT_AVAILABLE = 2; } optional string stop_id = 1; optional TranslatedString stop_code = 2; optional TranslatedString stop_name = 3; optional TranslatedString tts_stop_name = 4; optional TranslatedString stop_desc = 5; optional float stop_lat = 6; optional float stop_lon = 7; optional string zone_id = 8; optional TranslatedString stop_url = 9; optional string parent_station = 11; optional string stop_timezone = 12; optional WheelchairBoarding wheelchair_boarding = 13 [default = UNKNOWN]; optional string level_id = 14; optional TranslatedString platform_code = 15; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. message TripModifications { // A `Modification` message replaces a span of n stop times from each affected trip starting at `start_stop_selector`. message Modification { // The stop selector of the first stop_time of the original trip that is to be affected by this modification. // Used in conjuction with `end_stop_selector`. // `start_stop_selector` is required and is used to define the reference stop used with `travel_time_to_stop`. optional StopSelector start_stop_selector = 1; // The stop selector of the last stop of the original trip that is to be affected by this modification. // The selection is inclusive, so if only one stop_time is replaced by that modification, `start_stop_selector` and `end_stop_selector` must be equivalent. // If no stop_time is replaced, `end_stop_selector` must not be provided. It's otherwise required. optional StopSelector end_stop_selector = 2; // The number of seconds of delay to add to all departure and arrival times following the end of this modification. // If multiple modifications apply to the same trip, the delays accumulate as the trip advances. optional int32 propagated_modification_delay = 3 [default = 0]; // A list of replacement stops, replacing those of the original trip. // The length of the new stop times may be less, the same, or greater than the number of replaced stop times. repeated ReplacementStop replacement_stops = 4; // An `id` value from the `FeedEntity` message that contains the `Alert` describing this Modification for user-facing communication. optional string service_alert_id = 5; // This timestamp identifies the moment when the modification has last been changed. // In POSIX time (i.e., number of seconds since January 1st 1970 00:00:00 UTC). optional uint64 last_modified_time = 6; // 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } message SelectedTrips { // A list of trips affected with this replacement that all have the same new `shape_id`. repeated string trip_ids = 1; // The ID of the new shape for the modified trips in this SelectedTrips. // May refer to a new shape added using a GTFS-RT Shape message, or to an existing shape defined in the GTFS-Static feed’s shapes.txt. optional string shape_id = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // A list of selected trips affected by this TripModifications. repeated SelectedTrips selected_trips = 1; // A list of start times in the real-time trip descriptor for the trip_id defined in trip_ids. // Useful to target multiple departures of a trip_id in a frequency-based trip. repeated string start_times = 2; // Dates on which the modifications occurs, in the YYYYMMDD format. Producers SHOULD only transmit detours occurring within the next week. // The dates provided should not be used as user-facing information, if a user-facing start and end date needs to be provided, they can be provided in the linked service alert with `service_alert_id` repeated string service_dates = 3; // A list of modifications to apply to the affected trips. repeated Modification modifications = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. // Select a stop by stop sequence or by stop_id. At least one of the two values must be provided. message StopSelector { // 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 = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } // NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future. message ReplacementStop { // The difference in seconds between the arrival time at this stop and the arrival time at the reference stop. The reference stop is the stop prior to start_stop_selector. If the modification begins at the first stop of the trip, then the first stop of the trip is the reference stop. // This value MUST be monotonically increasing and may only be a negative number if the first stop of the original trip is the reference stop. optional int32 travel_time_to_stop = 1; // The replacement stop ID which will now be visited by the trip. May refer to a new stop added using a GTFS-RT Stop message, or to an existing stop defined in the GTFS-Static feed’s stops.txt. The stop MUST have location_type=0 (routable stops). optional string stop_id = 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; // The following extension IDs are reserved for private use by any organization. extensions 9000 to 9999; } </code></pre></div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type="button" class="md-top md-icon" 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Protobuf - General Transit Feed Specification