Overview
ISO 18750:2025 - "Intelligent transport systems - Local dynamic map (LDM)" defines the functionality, interfaces and procedures for a Local Dynamic Map used inside a bounded secured managed domain (BSMD) of an ITS station. The standard specifies the structure and behavior of LDM Data Objects (LDM‑DOs) (e.g., vehicle positions, road works, slow‑traffic sections, special weather condition sections) and the secure service access points that ITS applications use to add, query, subscribe to, and maintain map data. ISO 18750:2025 updates the 2018 edition and includes ASN.1 modules, a data dictionary and informative annexes on location/time referencing.
Key topics and technical requirements
- LDM Data Objects (LDM‑DOs): Defines general characteristics - minimum location‑referenced and time‑referenced attributes for real‑world objects stored in the LDM.
- Service Access Points & Interfaces: Specifies secure interfaces for:
- add, update and delete operations by ITS‑S application processes
- secure read/query operations
- secure subscription and notification mechanisms (time‑interval or event‑driven)
- management functions for registration, de‑registration and revocation of application processes
- Security & Privacy: Authorized access, initialization/installation procedures in the BSMD, and privacy considerations for shared LDM data.
- Procedures & Maintenance: Rules for maintaining data integrity, outdated data removal, LDM area of maintenance and archiving strategies.
- Multi‑LDM Support: Mechanisms and procedures to support several LDM instances within a single ITS station unit (ITS‑SU).
- Synchronization & Archiving: Processes for synchronizing LDMs and archiving LDM‑DOs.
- Knowledge Base & Metadata: Metadata requirements, utility functions and a formal LDM Data Dictionary; ASN.1 modules provided for implementations.
Practical applications and who uses ISO 18750
- Vehicle manufacturers and OEMs: Integrate LDMs into in‑vehicle ITS stations for cooperative perception and enhanced safety functions.
- Road operators and infrastructure providers: Publish dynamic road status (works, weather impacts) to nearby ITS stations.
- ITS platform and software vendors: Implement standardized LDM service access points, subscription/notification and data management.
- System integrators and mapping/data providers: Ensure compatibility of LDM‑DO formats and secure interfaces for multi‑application use.
- Regulators and standardization bodies: Reference for policy, compliance and interoperability testing across cooperative ITS deployments.
Related standards and references
- Developed by ISO/TC 204 (Intelligent transport systems) in cooperation with CEN/TC 278.
- Linked to cooperative ITS concepts (see ISO/TR 17465‑1) and other ITS message set standards; ASN.1 modules and a normative LDM Data Dictionary are included in annexes for implementers.
Keywords: ISO 18750, Local dynamic map, LDM, intelligent transport systems, ITS, LDM Data Objects, bounded secured managed domain, service access point, ASN.1, location‑referenced, time‑referenced.
