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Definition
Functional Requirements
Syntax
Semantics
Conformance Testing
Performance Assessment

1      Definition

Data sent by a specific Environment Sensing Technology Scene Description AIM to the AMS’s Traffic Obstacle Avoidance AIM because it is considered to hold information to be processed urgently, hence before the full Basic Scene Descriptors Data is computed.

2      Functional Requirements

An Alert includes specific objects that are deemed to require consideration. For example, a Scene Description AIM may immediately send a suddenly unobscured traffic sign to the Traffic Obstacle Avoidance AIM for consideration.

The EST Scene Description AIM may attach an Annotation to the Object that includes the semantics of the traffic sign Object. It may also add other numerical or textual information extracted from the Object. An example of Annotation is an element of the Vienna Convention on Road Signs and Signals for which CAV-TEC V1.1 provides the sign semantics.

3      Syntax

https://schemas.mpai.community/CAV2/V1.1/data/Alert.json

4      Semantics

Table 1 – Semantics of the Alert Data Type

Label
Description
Header Alert Header – Standard “CAV‑ALT‑Vx.y”.
MInstanceID Identifier of the M-Instance (Virtual Space) associated with this Alert.
UEnvironmentID Identifier of the U-Environment (Real Space) associated with this Alert.
AlertID Unique identifier of this Alert.
AlertTime Time this Alert was produced.
AlertData[] Set of Objects deemed to require urgent consideration by the Traffic Obstacle Avoidance AIM. Each item is one of: Audio Object, LiDAR Object, RADAR Object, Speech Object, Text Object, Ultrasound Object, or Visual Object.
DataXMData MPAI-PTF Data Exchange Metadata providing provenance, authorisation, legal, security, and confidence information associated with this Alert in a trusted data exchange context.
DescrMetadata Human-readable descriptive metadata of the Alert (plain text, max 2048 characters).

5      Conformance Testing

A Data instance conforms with Alert (CAV‑ALT) if:

  1. The Data validates against the Alert’s JSON Schema.
  2. All Data in the Alert’s JSON Schema:
    1. Have the specified type.
    2. Validate against their JSON Schemas.
    3. Conform with their Data Qualifiers.

6      Performance Assessment

Not part of this specification.

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