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 an Offline Data Format used by a CAV should consider the features of data formats such as:

  1. 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.
  2. SharedStreets Referencing System calls itself a global non-proprietary system for describing streets.

3       Syntax

4       Semantics

Label Size Description
Header N1 Bytes
·         Standard 9 Bytes The characters “CAV-OLM-V”
·         Version N2 Bytes Major version – 1 or 2 Bytes
·         Dot-separator 1 Byte The character “.”
·         Subversion N3 Bytes Minor version – 1 or 2 Bytes
OffLineMapSourceID N4 Bytes Identifier of Offline Map.
OffLineMapDataFormatID N5 Bytes Format ID of Offline Map Data
OffLineMapData N7 Bytes Offline Map Data.
DescrMetadata N11 Bytes Descriptive Metadata.

5       Data Formats

Several Data Formats are used in practice.

6       To Respondents

Respondents are requested to:

  1. Comment on the functional requirements of the Offline Map Data Format to support the most common offline map formats.
  2. Propose Data Formats and Attributes for use in the future Technical Specification: Data Types, Formats, and Attributes (MPAI-TFA).