1 Definition
An Offline Map or HD map or 3D map is a roadmap with cm-level accuracy and a high environmental fidelity reporting the positions of pedestrian crossings, traffic lights/signs, barriers etc. at the time the Offline Map has been created.
2 Functional Requirements
The features of Offline Map used by a CAV should consider the features of data formats such as:
- Navigation Data Standards calls itself “The Environment wide standard for map data in automotive eco-systems”. Their NDS specification covers data model, storage format, interfaces, and protocols.
- SharedStreets Referencing System calls itself a global non-proprietary system for describing streets.
3 Syntax
https://schemas.mpai.community/CAV2/V1.0/data/OfflineMap.json
4 Semantics
Label | Size | Description |
Header | N1 Bytes | Input Offline Map Header |
– Standard | 9 Bytes | The characters “CAV-IOM-V” |
– Version | N2 Bytes | Major version – 1 or 2 characters |
– Dot-separator | 1 Byte | The character “.” |
– Subversion | N3 Byte | Minor version – 1 or 2 characters |
MInstanceID | N4 Bytes | ID of the Virtual Space. |
InputOffline MapID | N5 Bytes | ID of Input Offline Map. |
Offline MapSensorID | N6 Bytes | ID of Offline Map Sensor. |
InputOffline Map | Ny Bytes | Set of Input Offline Map |
– InputOffline MapQualifier | N12 Bytes | The Qualifier of Input Offline Map |
– InputOffline MapPayload | N13 Bytes | The Payload of Input Offline Map |
– InputOffline MapDataLength | N14 Bytes | The Length of Input Offline Map Data in Bytes |
– InputOffline MapDataURI | N15 Bytes | URI of Input Offline Map Data |
DescrMetadata | N16 Bytes | Descriptive Metadata |
5 Data Formats
Several Sub-Types. Formats, and Attributes are required..
6 To Respondents
Respondents are requested to:
- Comment on the functional requirements of the Offline Map.
- Propose Sub-Types. Formats, and Attributes for use in the future Technical Specification: Data Types, Formats, and Attributes (MPAI-TFA).