ISO 18750:2018

Overview - ISO 18750:2018 (Local Dynamic Map, LDM)

ISO 18750:2018 defines the Local Dynamic Map (LDM) for Co-operative Intelligent Transport Systems (C-ITS) within a Bounded Secured Managed Domain (BSMD). The standard specifies how an LDM stores, maintains and shares time‑ and location‑referenced information (LDM Data Objects, or LDM‑DOs) about real-world entities such as vehicles, road works, slow‑traffic sections and special weather condition areas. It also defines secure interfaces, management functions and procedures for LDM operation inside an ITS station (ITS‑S / ITS‑SU).

Key technical topics and requirements

• LDM Data Objects (LDM‑DOs): General characteristics for data objects stored in an LDM - minimum requirements include location‑referencing and time‑referencing.
• Security and access control: Secure add/update/delete operations, secure queries (read), secure notifications (subscriptions), and secure registration/deregistration/revocation of ITS‑S application processes.
• Service access point functions: Standardized interfaces for application processes to access LDM services (data interface, application management, security and LDM management interfaces).
• Subscriptions and notifications: Mechanisms for ITS applications to subscribe to LDM content and receive event‑driven or time‑driven notifications.
• Maintenance and integrity: Procedures and mechanisms for maintaining content integrity, outdated data management, area of maintenance, synchronization of multiple LDMs, and archiving.
• Architecture and procedures: LDM placement in ITS station architectures, support for multiple LDMs within a single ITS station unit (ITS‑SCU), metadata and utility functions.
• Standards artifacts: ASN.1 modules, an LDM Data Dictionary and informative annexes on location/time referencing and example LDM‑DOs.

Practical applications and who uses this standard

ISO 18750:2018 is intended for implementers and stakeholders in the C‑ITS ecosystem:

• Automotive OEMs and Tier‑1 suppliers designing vehicle ITS‑stations and in‑vehicle applications that publish or consume LDM data.
• Road infrastructure operators and traffic management centers deploying roadside ITS‑stations and local maps for traffic control and safety.
• C‑ITS application developers building cooperative services like vehicle‑to‑vehicle (V2V), vehicle‑to‑infrastructure (V2I), hazard warnings, and automated driving assistance that rely on shared situational data.
• Security architects and integrators responsible for authentication, authorization and lifecycle management of ITS application processes inside a BSMD. Use cases include real‑time hazard sharing, coordinated traffic management, localized map services for automated driving, and multi‑application data sharing inside ITS station units.

Related standards

• ISO 21217 (CALM architecture)
• ISO/IEC 8824‑1 and ISO/IEC 8825‑2 (ASN.1 and PER encoding referenced for LDM message modules)
• ISO/IEC 9646‑7 (conformance testing framework)
• ISO TR 17465‑1 (C‑ITS background and concepts referenced in ISO 18750)

Keywords: ISO 18750:2018, Local Dynamic Map, LDM, LDM‑DO, Co‑operative ITS, BSMD, ITS station, secure interfaces, subscriptions, time‑referenced, location‑referenced.