ISO 21219-19:2023

Overview

ISO 21219-19:2023 - TPEG2-WEA defines the TPEG Weather (WEA) application for delivering weather information to travellers as part of Intelligent Transport Systems (ITS). The standard specifies how to encode weather forecasts and status information for multiple time periods and for one or more linked geographic areas. Presentation is left to the receiving device HMI, so the standard focuses on information structure, not visual/audio rendering.

Keywords: ISO 21219-19:2023, TPEG2, TPEG2-WEA, weather information, intelligent transport systems, traffic and travel information.

Key topics and technical requirements

• Message structure and components: Detailed definitions for WeatherMessage, WeatherInformation, WeatherReport, WeatherItem, WeatherStatistics, WeatherWarning and related message links and containers.
• Data types and tables: Normative datatypes and lookup tables (e.g., Period, TrendItem, Direction, Visibility, UVIndex, AirQuality, WarningLevel, ElementType and many element-specific tables for rain, snow, wind, fog, temperature, etc.).
• Representation formats: Normative specifications for both TPEG binary and TPEG-ML encodings (Annex A and Annex B).
• Extendibility and versioning: Rules for application identification, version number signalling, ordered components and extensibility to accommodate future elements.
• Interoperability aids: Worked examples (Annex C) and suggested mappings to WMO SYNOP weather observation codes (Annex D).
• Safety note: WEA provides general traveller weather information; specific weather-related safety warnings for drivers are handled in TPEG2-TEC (ISO 21219-15), not in WEA.

Applications

• Real-time and forecast weather feeds for in-vehicle infotainment, mobile travel apps, public transport displays and traffic management centres.
• Multi-modal traveller services where generalized weather information is needed (road, rail, air, maritime) without prescribing HMI presentation.
• Integration with ITS services (routing, travel time estimation, travel advisories) that consume structured weather elements like wind, visibility, precipitation, UV index and air quality.

Who uses this standard

• ITS solution architects, telematics vendors and broadcast/data service providers implementing TPEG2 services.
• Automotive OEMs and infotainment platform developers integrating standardized weather feeds.
• Traffic and transport authorities, weather data providers and middleware vendors aiming for interoperable TTI (traffic and travel information) services.

Related standards

• ISO 21219 series (TPEG2 family) - other parts cover technical events and safety (e.g., ISO 21219-15 TPEG2-TEC for safety-related messages).
• WMO SYNOP mapping guidance (referenced in Annex D for interoperability with meteorological observation codes).