ISO/TS 21219-21:2018 PDF

Overview

ISO/TS 21219-21:2018 (TPEG-GLR) specifies a compact geographic location referencing (GLR) method for use with TPEG Generation 2 (TPEG2) traffic and travel information. GLR defines how geographic locations on the Earth’s surface-points, polylines, and areas-are encoded so that TPEG applications can reference purely geographic locations (for example, weather, environmental warnings, safety alerts) inside a TPEG location referencing container (TPEG‑LRC). The toolkit is intentionally lightweight so it can be used in both navigation and non‑navigation devices.

Key topics and technical requirements

• Scope: GLR is limited to geographic locations on the Earth’s surface and is complementary to map‑based (road/artefact) location referencing methods.
• Location types supported: point, geographic line (polyline), geographic area, bounding box, bounding circle/sector.
• Toolkit structure: a single GLR instance carries one location type; components and datatypes are defined for consistent encoding and decoding.
• Datatypes and components: the standard defines datatypes such as CircleSector, GeographicAreaReference, GeographicBoundingBox, GeographicLineReference, GeographicPointReference and related message components.
• Physical representations: normative annexes provide both TPEG‑binary and TPEG‑ML (XML-like) representations for implementation.
• Versioning and extendibility: GLR signals version numbers (current: major 2, minor 0) and requires decoders to skip unknown components so future extensions remain backward compatible.
• Minimal dependencies: no normative external references; GLR is self-contained within the ISO/TS 21219 series modelling approach.

Applications and who uses it

• Weather and environmental services: encode locations for forecasts, warnings, and observation points.
• Safety alert systems: broadcast geographic hazard areas and point alerts to in‑vehicle systems and consumer devices.
• Broadcast and data services: radio/TV broadcasters, mobile data providers and content aggregators using TPEG to distribute location‑referenced messages.
• Device manufacturers and ITS integrators: in‑vehicle infotainment (IVI), telematics units, roadside equipment and non‑navigation consumer devices that need simple geographic referencing.
• Service developers and system architects: designing TPEG2 applications that require a compact, interoperable geographic referencing option.

Related standards

• ISO/TS 21219 series (TPEG2): toolkit and application parts (e.g., TPEG‑LRC for location referencing containers).
• TPEG Generation 2 specifications and conversion rules (binary and TPEG‑ML) described across ISO/TS 21219 parts.

Keywords: ISO/TS 21219-21:2018, TPEG-GLR, geographic location referencing, TPEG2, intelligent transport systems, TPEG-LRC, traffic and travel information, weather alerts, safety alerts.