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Definition
Functional Requirements
Syntax
Semantics
Conformance Testing
Performance Assessment

1      Definition

LiDAR Scene Descriptors are a Data Type including the LiDAR Objects of a scene, their Sub-Scenes, and their arrangement in the Scene. LiDAR Scene Descriptors may be hierarchical, i.e., they may contain Objects and LiDAR Scene Descriptors.

2      Functional Requirements

A LiDAR Scene Descriptors instance must include:

  1. The LiDAR Scene Descriptors Header.
  2. The ID of the LiDAR Scene Descriptors instance.
  3. The Space/Time of the LiDAR Scene Descriptors instance.

A LiDAR Scene Descriptors instance may include:

  1. The ID of a Virtual Space (M-Instance) where it is or is intended to be located.
  2. The ID of a U-Environment (Real Space) where it is or is intended to be located.
  3. Time when this instance was produced.
  4. LiDAR Objects in the LiDAR Scene, each with their Space/Time.
  5. LiDAR Sub-Scenes in the LiDAR Scene, each with their Space/Time.
  6. A mixed array of Basic LiDAR Scene Descriptors and LiDAR Scene Descriptors.
  7. MPAI-PTF Data Exchange Metadata.
  8. Descriptive Metadata.

3      Syntax

https://schemas.mpai.community/OSD/V1.5/data/LiDARSceneDescriptors.json

4      Semantics

Table 1 – Semantics of the LiDAR Scene Descriptors Data Type

Label
Description
Header LiDAR Scene Descriptors Header – Standard “OSD‑LSD‑Vx.y”.
MInstanceID Identifier of the M-Instance (Virtual Space) where this LiDAR Scene is or is intended to be located.
UEnvironmentID Identifier of the U-Environment (Real Space) where this LiDAR Scene is or is intended to be located.
LiDARSceneDescriptorsID Unique identifier of this LiDAR Scene Descriptors instance.
LiDARSceneDescriptorsTime Time this LiDAR Scene Descriptors instance was produced.
LiDARSceneDescriptorsSpaceTime Space/Time where/when this LiDAR Scene Descriptors instance is located.
LiDARObjectCount Number of LiDAR Objects in the LiDAR Scene.
LiDARObjects[] Set of LiDAR Objects in the LiDAR Scene.
    – LiDARObjectSpaceTime Space/Time where/when this LiDAR Object is located within the LiDAR Scene.
    – ObjectIDOrObject Either the ID of a LiDAR Object or the LiDAR Object itself.
SubLiDARSceneCount Number of LiDAR Sub-Scenes in the LiDAR Scene.
SubLiDARScenes[] Set of LiDAR Sub-Scenes in the LiDAR Scene.
    – SubLiDARSceneSpaceTime Space/Time where/when this LiDAR Sub-Scene is located within the LiDAR Scene.
    – SubLiDARSceneIDOrSubLiDARScene Either the ID of a LiDAR Sub-Scene or the LiDAR Sub-Scene itself.
BasicLiDARSceneOrLiDARScene A mixed array of Basic LiDAR Scene Descriptors and LiDAR Scene Descriptors.
DataXMData MPAI-PTF Data Exchange Metadata providing provenance, authorisation, legal, security, and confidence information associated with this LiDAR Scene Descriptors instance in a trusted data exchange context.
DescrMetadata Human-readable descriptive metadata of the LiDAR Scene Descriptors instance (plain text, max 2048 characters).

5      Conformance Testing

A Data instance conforms with LiDAR Scene Descriptors (OSD‑LSD) if:

  1. The Data validates against the LiDAR Scene Descriptors’ JSON Schema.
  2. All Data in the LiDAR Scene Descriptors’ 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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