osi_common.proto

syntax = "proto2";

option optimize_for = SPEED;

package osi3;

//
// \brief A cartesian 3D vector for positions, velocities or accelerations or
// its uncertainties.
//
// The coordinate system is defined as right-handed.
//
// Units are m for positions, m/s for velocities, and m/s^2 for
// accelerations.
//
message Vector3d
{
    // The x-coordinate.
    //
    // Unit: m, m/s, or m/s^2
    //
    optional double x = 1;

    // The y-coordinate.
    //
    // Unit: m, m/s, or m/s^2
    //
    optional double y = 2;

    // The z-coordinate.
    //
    // Unit: m, m/s, or m/s^2
    //
    optional double z = 3;
}

//
// \brief A cartesian 2D vector for positions, velocities or accelerations or
// its uncertainties.
//
// Units are m for positions, m/s for velocities, and m/s^2 for
// accelerations.
//
message Vector2d
{
    // The x-coordinate.
    //
    // Unit: m, m/s, or m/s^2
    //
    optional double x = 1;

    // The y-coordinate.
    //
    // Unit: m, m/s, or m/s^2
    //
    optional double y = 2;
}

//
// \brief A timestamp.
//
// Names and types of fields are chosen in accordance to
// google/protobuf/timestamp.proto to allow a possible switch in the future.
// There is no definition of the zero point in time neither it is the Unix
// epoch. A simulation may start at the zero point in time but it is not
// mandatory.
//
message Timestamp
{
    // The number of seconds since the start of e.g. the simulation / system /
    // vehicle.
    //
    // Unit: s
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional int64 seconds = 1;

    // The number of nanoseconds since the start of the last second.
    //
    // Range: [0, 999.999.999]
    //
    // Unit: ns
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // is_less_than_or_equal_to: 999999999
    // \endrules
    //
    optional uint32 nanos = 2;
}

//
// \brief The dimension of a 3D box, e.g. the size of a 3D bounding box or its
// uncertainties.
//
// \image html OSI_Dimension3D.svg
//
// The dimensions are positive. Uncertainties are negative or positive.
//
// Dimension is defined in the specified reference coordinate frame along the
// x-axis (=length), y-axis (=width) and z-axis (=height).
//
message Dimension3d
{
    // The length of the box.
    //
    // Unit: m
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional double length = 1;

    // The width of the box.
    //
    // Unit: m
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional double width = 2;

    // The height of the box.
    //
    // Unit: m
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional double height = 3;
}

//
// \brief A 3D orientation, orientation rate or orientation acceleration (i.e.
// derivatives) or its uncertainties denoted in euler angles.
//
// Units are rad for orientation, rad/s for rates, and rad/s^2 for
// accelerations
//
// The coordinate system is defined as right-handed.
// For the sense of each rotation, the right-hand rule applies.
//
// The rotations are to be performed \b yaw \b first (around the z-axis),
// \b pitch \b second (around the new y-axis) and \b roll \b third (around the
// new x-axis) to follow the definition according to [1] (Tait-Bryan / Euler
// convention z-y'-x''). The preferred angular range is [-pi, pi] for roll 
// and yaw and [-pi/2, pi/2] for pitch. 
//
// Roll/Pitch are 0 if the objects xy-plane is parallel to its parent's
// xy-plane. Yaw is 0 if the object's local x-axis is parallel to its parent's
// x-axis.
//
// \f$ Rotation_{yaw,pitch,roll} =
// Rotation_{yaw}*Rotation_{pitch}*Rotation_{roll} \f$
//
// \f$ vector_{gobal coord system} := Rotation_{yaw, pitch, roll} * vector_{local coord system} +local_{origin::position} \f$
//
// \attention This definition changed in OSI version 3.0.0. Previous OSI
// versions  (V2.xx) had an other definition.
//
// \par Reference:
// [1] DIN Deutsches Institut fuer Normung e. V. (2013). <em>DIN ISO 8855 Strassenfahrzeuge - Fahrzeugdynamik und Fahrverhalten - Begriffe</em>. (DIN ISO 8855:2013-11). Berlin, Germany.
//
message Orientation3d
{
    // The roll angle/rate/acceleration.
    //
    // Unit: rad, rad/s, or rad/s^2
    //
    optional double roll = 1;

    // The pitch angle/rate/acceleration.
    //
    // Unit: rad, rad/s, or rad/s^2
    //
    optional double pitch = 2;

    // The yaw angle/rate/acceleration.
    //
    // Unit: rad, rad/s, or rad/s^2
    //
    optional double yaw = 3;
}

//
// \brief A common identifier (ID), represented as an integer.
//
// Has to be unique among all simulated items at any given time. For ground
// truth, the identifier of an item (object, lane, sign, etc.) must remain
// stable over its lifetime. \c Identifier values may be only be reused if the
// available address space is exhausted and the specific values have not been in
// use for several timesteps. Sensor specific tracking IDs have no restrictions
// and should behave according to the sensor specifications.
//
// The value MAX(uint64) = 2^(64) -1 =
// 0b1111111111111111111111111111111111111111111111111111111111111111 is
// reserved and indicates an invalid ID or error.
//
message Identifier
{
    // The identifier's value.
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional uint64 value = 1;
}

// \brief References to external objects.
//
// The external reference is an optional recommendation to refer to objects defined outside of OSI.
// This could be other OpenX standards, 3rd-party standards or user-defined objects.
//
// \note ExternalReference is optional and can be left empty.
//
message ExternalReference
{
    // The source of the external references.
    //
    // Defines the original source of an object as uniquely identifiable reference.
    // In case of using \c GroundTruth::map_reference or 
    // \c GroundTruth::model_reference, the reference can be left empty.
    // If not otherwise required, an URI is suggested. The syntax should follow 
    // \link https://tools.ietf.org/html/rfc3986 RFC 3986\endlink.
    //
    //
    optional string reference = 1;
    
    // The type of the external references.
    //
    // Mandatory value describing the type of the original source.
    //
    // For OpenX/ASAM standards it is specified as follows:
    // - net.asam.opendrive
    // - net.asam.openscenario
    //
    // For third-party standards and user-defined objects, 
    // reverse domain name notation with lower-case type field
    // is recommended to guarantee unique and interoperable identification.
    //
    optional string type = 2;    
    
    // The external identifier reference value.
    //
    // The repeated string is chosen as a common description of the external
    // identifier, because a variety of identificatier types could be
    // involved .
    //
    // For example, referencing a unique lane in OpenDRIVE requires the
    // following identifiers:
    // * RoadId: String
    // * S-Value of LaneSection: Double
    // * LaneId: Int
    // 
    // \note The detailed description of the identifiers and how they are 
    //       used for referencing external objects is given in the individual
    //       messages where the external identifier is used.
    //
    // \see EnvironmentalConditions::source_reference
    // \see Lane::source_reference
    // \see LaneBoundary::source_reference
    // \see StationaryObject::source_reference
    // \see MovingObject::source_reference
    // \see RoadMarking::source_reference
    // \see TrafficLight::source_reference
    // \see TrafficSign::source_reference
    //
    repeated string identifier = 3;
}

//
// \brief Specifies the mounting position of a sensor.
//
// Details are specified in each instance where \c MountingPosition is used.
//
message MountingPosition
{
    // Offset position relative to the specified reference coordinate system.
    //
    optional Vector3d position = 1;

    // Orientation offset relative to the specified reference coordinate system.
    //
    // \f$ Origin_{sensor} :=
    // Rotation_{yaw,pitch,roll}( \f$ \c #orientation \f$
    // )*(Origin_{\text{reference coord system}}
    // - \f$ \c #position \f$ )\f$
    //
    optional Orientation3d orientation = 2;
}

//
// \brief A spherical representation for a point or vector in 3D space.
//
// Used e.g., for low level representations of radar detections.
//
// Azimuth and elevation are defined as the rotations that would have to be
// applied to the local frame (e.g sensor frame definition in
// \c SensorDetectionHeader) to make its x-axis point towards the referenced
// point or to align it with the referenced vector. The rotations are to be
// performed \b azimuth \b first (around the z-axis) and \b elevation \b second
// (around the new y-axis) to follow the definition of \c Orientation3d. For the
// sense of each rotation, the right-hand rule applies.
//
// \f$ vector_{cartesian} :=
// Rotation( \f$ \c #elevation \f$ )*Rotation( \f$ \c #azimuth \f$ )*
// (Unit_{vector_x}* \f$ \c #distance \f$ ) \f$
//
message Spherical3d
{
    // The radial distance.
    //
    // Unit: m
    //
    // \rules
    // is_greater_than_or_equal_to: 0
    // \endrules
    //
    optional double distance = 1;

    // The azimuth (horizontal) angle.
    //
    // Unit: rad
    //
    optional double azimuth = 2;

    // The elevation (vertical) angle.
    //
    // Unit: rad
    //
    optional double elevation = 3;
}

//
// \brief Assignment of an object to a logical lane
//
// An object is assigned to a logical lane if it overlaps the logical lane.
// Assignment happens even if the reference point is outside the lane, and only
// a part of the object overlaps (any object overlapping the lane more than 5cm
// has to be assigned to the lane).
//
// As an exception to this, \c TrafficSign and \c TrafficLight are assigned to
// a logical lane if they control traffic on that lane. For \c TrafficSign and
// \c TrafficLight , #s_position refers to the position where the sign or light
// is valid (e.g. where vehicles should stop in case of a red traffic light),
// not the physical position (where the sign or light is in the world).
// Typically, t_position and angle_to_lane do not have any meaning in this
// case, and will be 0.
//
message LogicalLaneAssignment
{
    // ID of the LogicalLane the object is assigned to.
    //
    // \rules
    // refers_to: LogicalLane
    // \endrules
    //
    optional Identifier assigned_lane_id = 1;

    // S position of the object reference point on the lane, in the ST
    // coordinate system of the lane.
    //
    // #s_position might be outside [s_start,s_end] of the lane (and even
    // outside [startS,endS] of the reference line) if the reference point is
    // outside the lane, but the object overlaps the lane or a TrafficSign or
    // TrafficLight is assigned to a lane.
    //
    optional double s_position = 2;

    // T position of the object reference point on the lane, in the ST
    // coordinate system of the lane.
    //
    optional double t_position = 3;

    // Angle of the object relative to the lane.
    // See the ReferenceLine description how the angle is calculated.
    //
    // Unit: rad
    //
    optional double angle_to_lane = 4;
}

//
// \brief The base attributes of a stationary object or entity.
//
// This includes the \c StationaryObject , \c TrafficSign ,
// \c TrafficLight , \c RoadMarking messages.
//
// \image html OSI_BaseStationary.svg
//
// All coordinates and orientations from ground truth objects are relative to
// the global ground truth frame (see image). (All coordinates and orientations
// from detected objects are relative to the host vehicle frame (see:
// \c Vehicle vehicle reference point).)
//
message BaseStationary
{
    // The 3D dimensions of the stationary object (bounding box), e.g. a
    // landmark.
    //
    optional Dimension3d dimension = 1;

    // The reference point for position and orientation, i.e. the center (x,y,z)
    // of the bounding box.
    //
    optional Vector3d position = 2;

    // The relative orientation of the stationary object w.r.t. its parent
    // frame, noted in the parent frame. The orientation becomes global/absolute
    // if the parent frame is inertial (all parent frames up to ground truth).
    //
    // \f$ Origin_{\text{base stationary entity}} :=
    // Rotation_{yaw,pitch,roll}( \f$ \c #orientation \f$ )*
    // (Origin_{\text{parent coord system}} -
    // \f$ \c #position \f$ )\f$
    //
    // \note There may be some constraints how to align the orientation w.r.t.
    // to some stationary object's or entity's definition.
    //
    optional Orientation3d orientation = 3;

    // Usage as ground truth:
    // The two dimensional (flat) contour of the object. This is an extension of
    // the concept of a bounding box as defined by \c Dimension3d. The contour
    // is the projection of the object's outline onto the z-plane in the object
    // frame (independent of its current position and orientation). The height
    // is the same as the height of the bounding box.
    //
    // Usage as sensor data:
    // The polygon describes the visible part of the object's contour.
    //
    // General definitions:
    // The polygon is defined in the local object frame: x pointing forward and
    // y to the left.
    // The origin is the center of the bounding box.
    // As ground truth, the polygon is closed by connecting the last with the
    // first point. Therefore these two points must be different. The polygon
    // must consist of at least three points.
    // As sensor data, however, the polygon is open.
    // The polygon is defined counter-clockwise.
    //
    repeated Vector2d base_polygon = 4;
}

//
// \brief The base attributes of an object that is moving.
//
// This includes the \c MovingObject messages.
//
// \image html OSI_BaseMoving.svg
//
// \image html OSI_BaseMoving_Top.svg
//
// E.g. a vehicle is a base moving object.
//
// All coordinates and orientations from ground truth objects are relative to
// the global ground truth frame. All coordinates and orientations
// from detected objects are relative to the host vehicle frame
// (see: \c MovingObject vehicle reference point).
//
message BaseMoving
{
    // The 3D dimension of the moving object (its bounding box).
    //
    // \note The bounding box does NOT include side mirrors for vehicles.
    //
    optional Dimension3d dimension = 1;

    // The reference point for position and orientation: the center (x,y,z) of
    // the bounding box.
    //
    optional Vector3d position = 2;

    // The relative orientation of the moving object w.r.t. its parent frame,
    // noted in the parent frame. The orientation becomes global/absolute if
    // the parent frame is inertial (all parent frames up to ground truth).
    //
    // \f$ Origin_{\text{base moving entity}} :=
    // Rotation_{yaw,pitch,roll}( \f$ \c #orientation \f$ )*
    // (Origin_{\text{parent coord system}} -
    // \f$ \c #position \f$ ) \f$
    //
    // \note There may be some constraints how to align the orientation w.r.t.
    // to some stationary object's or entity's definition.
    //
    optional Orientation3d orientation = 3;

    // The relative velocity of the moving object w.r.t. the parent frame,
    // noted in the parent frame. The velocity becomes global/absolute if
    // the parent frame does is inertial (all parent frames up to ground truth).
    //
    // \c #position \f$ (t) := \f$ \c #position \f$ (t-dt)+ \f$ \c #velocity \f$
    // *dt \f$
    //
    optional Vector3d velocity = 4;

    // The relative acceleration of the moving object w.r.t. its parent frame,
    // noted in the parent frame. The acceleration becomes global/absolute if
    // the parent frame is inertial (all parent frames up to ground truth).
    //
    // \c #position \f$ (t) := \f$ \c #position \f$ (t-dt)+ \f$ \c #velocity \f$
    // *dt+ \f$ \c #acceleration \f$ /2*dt^2\f$
    //
    // \c #velocity \f$ (t) := \f$ \c #velocity \f$ (t-dt)+ \f$ \c #acceleration
    // \f$ *dt \f$
    //
    optional Vector3d acceleration = 5;

    // The relative orientation rate of the moving object w.r.t. its parent
    // frame and parent orientation rate in the center point of the bounding box
    // (origin of the bounding box frame), noted in the parent frame.
    // The orientation becomes global/absolute if the parent frame is inertial
    // (all parent frames up to ground truth).
    //
    // \c #orientation \f$ .yaw(t) := \f$ \c #orientation_rate \f$ .yaw(t) * dt
    // + \f$ \c #orientation \f$ .yaw(t-dt) \f$
    //
    // \c #orientation \f$ .pitch(t) := \f$ \c #orientation_rate \f$ .pitch(t) *
    // dt + \f$ \c #orientation \f$ .pitch(t-dt) \f$
    //
    // \c #orientation \f$ .roll(t) := \f$ \c #orientation_rate \f$ .roll(t) *
    // dt + \f$ \c #orientation \f$ .roll(t-dt)\f$
    //
    optional Orientation3d orientation_rate = 6;

    // The relative orientation acceleration of the moving object w.r.t. its
    // parent frame and parent orientation acceleration in the center point of
    // the bounding box (origin of the bounding box frame), noted in the parent
    // frame. The orientation becomes global/absolute if the parent frame is
    // inertial (all parent frames up to ground truth).
    //
    // \c #orientation_rate \f$ .yaw(t) := \f$ \c #orientation_acceleration \f$
    // .yaw(t) * dt + \f$ \c #orientation_rate \f$ .yaw(t-dt) \f$
    //
    // \c #orientation_rate \f$ .pitch(t) := \f$ \c #orientation_acceleration
    // \f$ .pitch(t) * dt
    // + \f$ \c #orientation_rate \f$ .pitch(t-dt) \f$
    //
    // \c #orientation_rate \f$ .roll(t) := \f$ \c #orientation_acceleration \f$
    // .roll(t) * dt +
    //  \f$ \c #orientation_rate \f$ .roll(t-dt) \f$
    //
    optional Orientation3d orientation_acceleration = 8;

    // Usage as ground truth:
    // The two dimensional (flat) contour of the object. This is an extension of
    // the concept of a bounding box as defined by \c Dimension3d. The contour
    // is the projection of the object's outline onto the z-plane in the object
    // frame (independent of its current position and orientation). The height
    // is the same as the height of the bounding box.
    //
    // Usage as sensor data:
    // The polygon describes the visible part of the object's contour.
    //
    // General definitions:
    // The polygon is defined in the local object frame: x pointing forward and
    // y to the left. The origin is the center of the bounding box.
    // As ground truth, the polygon is closed by connecting the last with the
    // first point. Therefore these two points must be different. The polygon
    // must consist of at least three points. As sensor data, however, the
    // polygon is open.
    // The polygon is defined counter-clockwise.
    //
    repeated Vector2d base_polygon = 7;
}

//
// \brief The StatePoint definition
//
// A reference to a time and pose.  Typically used in a repeated field to define
// a trajectory.
//
// \note The StatePoint definition does not define mandatory fields.
// The context defines how and what fields are used.  For example, in some cases
// only the pose variables are relevant and the timestamp is ignored.
//
message StatePoint
{
    // The timestamp of a StatePoint.
    //
    // \note Zero time does not need to coincide with the UNIX epoch.
    //
    optional Timestamp timestamp = 1;

    // Position in the global coordinate system.
    //
    // \note Remark: The definition of the reference point follows the
    // specification of the \c BaseMoving message, if not specified otherwise
    // in the message the StatePoint is used in.
    //
    optional Vector3d position = 2;

    // Orientation in the global coordinate system.
    //
    optional Orientation3d orientation = 3;
}

//
// \brief Detailed WavelengthRange message.
//
// Defines the start (minimum) and the end (maximum) values of the wavelength.
// Additionally, the number of samples within this range is defined in this message.
//
message WavelengthData
{
    // The start, or the minimum wavelength value.
    //
    // Unit: m
    //
    optional double start = 1;

    // The end, or the maximum wavelength value.
    //
    // Unit: m
    //
    optional double end = 2;

    // Number of samples to be considered within the defined wavelength range.
    // The number of samples includes the start and the end values that are defined in this message, starting from the "start" value.
    // \note This defines the number of wavelengths to be computed during simulation, not to be confused with samples_per_pixel.
    //
    optional double samples_number = 3;
}

//
// \brief Definition of a spatial signal strength distribution
// for an emitting / transmitting / receiving entity
// with a horizontal and a vertical angle
// and the corresponding signal strength in dBm (decibels per milliwatt).
//
message SpatialSignalStrength
{
    // Horizontal angle (azimuth) of emission / transmission / reception
    // in the entity's coordinate system.
    //
    // Unit: rad
    //
    optional double horizontal_angle = 1;

    // Vertical angle (elevation) of emission / transmission / reception
    // in the entity's coordinate system.
    //
    // Unit: rad
    //
    optional double vertical_angle = 2;

    // Emitted / transmitted /received signal strength
    // of the emitting / transmitting / receiving entity
    // at the previously defined horizontal and
    // vertical angle for one specific wavelength.
    // The value for the signal strength
    // is given in dBm (decibels per milliwatt).
    //
    // Unit: dBm
    //
    optional double signal_strength = 3;
}

//
// \brief The description of a color within available color spaces.
//
// ColorDescription represents the visual, non-semantic appearance of an object, structure or feature within various available color spaces.
//
// Depending on the context, this may define the color of an object or structure a priori (e.g. GroundTruth objects)
// or describe a perceived color (e.g. CameraDetections).
//
message ColorDescription
{
    // Greyscale color model
    //
    optional ColorGrey grey = 1;

    // RGB (Red, Green, Blue) color model
    //
    optional ColorRGB rgb = 2;

    // RGBIR (Red, Green, Blue, Infrared) color model
    //
    optional ColorRGBIR rgbir = 3;

    // HSV (Hue, Saturation, Value) color model
    //
    optional ColorHSV hsv = 4;

    // LUV (Luminance, U-coordinate, V-coordinate) color model
    //
    optional ColorLUV luv = 5;

    // CMYK (Cyan, Magenta, Yellow, Key) color model
    //
    optional ColorCMYK cmyk = 6;
}

//
// \brief Greyscale color model
//
// ColorGrey defines a greyscale.
//
message ColorGrey
{
    // Definition of a greyscale
    //
    // Range: [0,1]
    //
    optional double grey = 1;
}

//
// \brief RGB color model
//
// ColorRGB provides values for red, green and blue.
//
message ColorRGB
{
    // Red ratio
    //
    // Range: [0,1]
    //
    optional double red = 1;

    // Green ratio
    //
    // Range: [0,1]
    //
    optional double green = 2;

    // Blue ratio
    //
    // Range: [0,1]
    //
    optional double blue = 3;
}

//
// \brief RGBIR color model
//
// ColorRGBIR provides values for red, green, blue and infrared.
//
message ColorRGBIR
{
    // Red ratio
    //
    // Range: [0,1]
    //
    optional double red = 1;

    // Green ratio
    //
    // Range: [0,1]
    //
    optional double green = 2;

    // Blue ratio
    //
    // Range: [0,1]
    //
    optional double blue = 3;

    // Infrared
    //
    // Range: [0,1]
    //
    optional double infrared = 4;
}

//
// \brief HSV color model
//
// ColorHSV provides values for hue, saturation and value/brightness.
//
message ColorHSV
{
    // Hue
    //
    // Unit: deg
    // Range: [0,360[
    //
    optional double hue = 1;

    // Saturation
    //
    // Range: [0,1]
    //
    optional double saturation = 2;

    // Value
    //
    // Range: [0,1]
    //
    optional double value = 3;
}

//
// \brief LUV color model
//
// ColorLUV provides values for luminance, U- and V-coordinate.
//
message ColorLUV
{
    // Luminance
    //
    // Range: [0,1]
    //
    optional double luminance = 1;

    // U-coordinate
    //
    // Range: [0,1]
    //
    optional double u = 2;
    
    // V-Coordinate
    //
    // Range: [0,1]
    //
    optional double v = 3;
}

//
// \brief CMYK colors model
//
// ColorCMYK provides values for cyan, magenta, yellow and key/black.
//
message ColorCMYK
{
    // Cyan ratio
    //
    // Range: [0,1]
    //
    optional double cyan = 1;

    // Magenta ratio
    //
    // Range: [0,1]
    //
    optional double magenta = 2;

    // Yellow ratio
    //
    // Range: [0,1]
    //
    optional double yellow = 3;

    // Black ratio
    //
    // Range: [0,1]
    //
    optional double key = 4;
}

//
// \brief A description for the positions of the pedals.
//
message Pedalry
{
    // Position of the acceleration pedal.
    // Range: 0-1 (Unpressed - fully pressed)
    //
    optional double pedal_position_acceleration = 1;

    // Position of the brake pedal.
    // Range: 0-1 (Unpressed - fully pressed)
    //
    optional double pedal_position_brake = 2;

    // Position of the clutch pedal.
    // Range: 0-1 (Unpressed - fully pressed)
    //
    optional double pedal_position_clutch = 3;
}

//
// \brief A description of the steering wheel.
//
message VehicleSteeringWheel
{
    // Angle of the steering wheel. 
    // Zero means the steering wheel is in its center position. A positive value
    // means the steering wheel is turned to the left. A negative value
    // means the steering wheel is turned to the right of the center position.
    //
    // Unit: rad
    //
    optional double angle = 1;

    // Angular speed of the steering wheel. 
    // Zero means the steering wheel stays in its position. A positive value
    // means the steering wheel is turned to the left. A negative value
    // means the steering wheel is turned to the right.
    //
    // Unit: rad/s
    //
    optional double angular_speed = 2;

    // Torque of the steering wheel to the hand.
    // Zero means there is no force from the steering wheel to the hand of the driver.
    // A positive value means that the steering wheel would turn to the left without driver intervention.
    // A negative value means that the steering wheel would turn to the right without driver intervention.
    //
    // Unit: N*m
    //
    optional double torque = 3;
}

//
// \brief The geodetic position of an object, that is, the center of the 3D bounding box.
//
message GeodeticPosition
{
    // Longitude in decimal degrees regarding WGS84.
    //
    // Unit: Degree
    // Range: [-180; 180]
    //
    optional double longitude = 1;

    // Latitude in decimal degrees regarding WGS84.
    //
    // Unit: Degree
    // Range: [-90; 90]
    //
    optional double latitude = 2;

    // Height above sea level regarding EGM96.
    //
    // Unit: m
    // Range: [-300; 10000]
    //
    optional double altitude = 3;
}

//
// \brief Generic key-value pair structure
//
// A generic key-value pair structure which can be used to capture information
// which is opaque to the general OSI interface.
//
message KeyValuePair
{
    // A generic string key.
    //
    optional string key = 1;

    // A generic string value.
    //
    optional string value = 2;
}