Introduction
This section discusses the Track Distribution Protocol.
Contents
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Each message includes a header of 6 bytes followed by a variable length payload. The header includes the protocol version, message type and payload size enabling the client software to reliably decode the payload data as required.
Field | Type [Size] | Description |
|---|---|---|
Version | uint8_t [1] | Protocol version – indicates the revision of the protocol messages |
Message Type | uint8_t [1] | Message type – indicates the type of the payload |
Payload Length | uint32_t [4] | The length, in bytes, of the main body of the message |
Track Distribution Message
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syntax = "proto3";
package TrackProtobuf;
message DistributionTrack {
string uniqueid = 1;
int32 trackid = 2;
int64 senderid = 3;
uint32 channelid = 4;
double speedmps = 5;
double coursedegrees = 6;
int32 classification = 7;
double classificationprobability = 8;
double xposition = 9;
double yposition = 10;
double latitude = 11;
double longitude = 12;
string tag = 13;
double sizeinaz = 14;
double sizeinrange = 15;
uint32 seen = 16;
int32 coasts = 17;
int64 laneuserid = 18;
int64 sectionuserid = 19;
string carriagewayname = 20;
} |
Protobuf Fields
Field | Description |
|---|---|
UniqueId | A string representation of a GUID that represents the unique Id of the track |
TrackId | User friendly numeric Id for each track. Note that this Id is not unique across the system |
SenderId | User friendly numeric Id of the radar which generated the track. This value represents the User Id which is configured in the Witness software |
ChannelId | This is the index of tracking channel from which the track was generated. Typically in ClearWay, this will represent the channel use for each carriageway |
SpeedMps | The speed of the track in metres / second |
CourseDegrees | The course of the track in degrees |
Classification | The track classification Id. Options are:
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ClassificationProbability | The confidence level of the classification represented as a value between 0 and 1. |
XPosition | X coordinate of the track based on the local Witness site coordinate system |
YPosition | Y coordinate of the track based on the local Witness site coordinate system |
Latitude | Latitude coordinate of the track based on WGS84 datum |
Longitude | Longitude coordinate of the track based on WGS84 datum |
Tag | User friendly name / description of the track. Typically not used in ClearWay |
SizeInAz | The size of the track along the azimuth |
SizeInRange | The size of the track along the range |
Seen | Number of sightings of the track |
Coasts | Monitors the number of times a target is perceived to be coasting |
LaneUserId | User friendly numeric Id for each carriageway lane |
SectionUserId | User friendly numeric Id of the section |
CarriagewayName | Name of the carriageway |
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