ISO 21219-21:2025
(Main)Intelligent transport systems — Traffic and travel information (TTI) via transport protocol experts group, generation 2 (TPEG2) — Part 21: Geographic location referencing (TPEG-GLR)
Intelligent transport systems — Traffic and travel information (TTI) via transport protocol experts group, generation 2 (TPEG2) — Part 21: Geographic location referencing (TPEG-GLR)
This document establishes a method of using geographic location referencing (GLR) that can be used by relevant TPEG applications. The GLR type, defined in this document, is used for defining geographic location references (points, polylines and geographical areas). The GLR method is intended to be one of the methods that can be transported inside a TPEG-Location Referencing Container (TPEG-LRC) for those TPEG applications providing information for primarily geographical locations (e.g. weather). The GLR specification is deliberately kept basic and compact, so that it can also be employed advantageously in non-navigation devices, for simple TPEG services such as weather information, safety alerts, etc. As such, the GLR location referencing method is intended to be complementary to map-related location referencing methods, where the focus is on the referencing of anthropogenic artefacts such as roads and highways. For this reason, the scope of GLR is limited to geographic locations on the Earth’s surface.
Systèmes intelligents de transport — Informations sur le trafic et le tourisme via le groupe expert du protocole de transport, génération 2 (TPEG2) — Partie 21: Information géographique (TPEG-GLR)
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International
Standard
ISO 21219-21
First edition
Intelligent transport systems —
2025-01
Traffic and travel information (TTI)
via transport protocol experts
group, generation 2 (TPEG2) —
Part 21:
Geographic location referencing
(TPEG-GLR)
Systèmes intelligents de transport — Informations sur le trafic
et le tourisme via le groupe expert du protocole de transport,
génération 2 (TPEG2) —
Partie 21: Information géographique (TPEG-GLR)
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Toolkit specific constraints. 2
5.1 Version number signalling .2
5.2 Extendibility .2
6 GLR toolkit structure . 2
6.1 General .2
6.2 Geographic bounding box location reference .5
6.3 Geographic bounding circle or sector of circle location reference .5
6.4 Geographic point location reference .7
6.5 Geographic line location reference .7
6.6 Geographic area location reference .8
7 GLR toolkit components . 9
7.1 GeographicLocationReference .9
8 GLR Datatypes . 10
8.1 GeographicAreaReference .10
8.2 GeographicAreaWithHolesReference .10
8.3 GeographicBoundingBox .11
8.4 GeographicBoundingCircleSector .11
8.5 GeographicLineReference . 12
8.6 GeographicPointReference . 12
8.7 CircleSector . 13
8.8 Coordinate . 13
8.9 HierarchicalAreaName .14
8.10 Polygon .14
Annex A (normative) TPEG application, TPEG-binary representation .16
Annex B (normative) TPEG application, tpegML representation.23
Bibliography .29
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
This first edition cancels and replaces the first edition of ISO/TS 21219-21:2018, which has been technically
revised.
The main changes are as follows:
— the document status has been changed from Technical Specification (TS) to International Standard (IS).
A list of all parts in the ISO 21219 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
0.1 History
TPEG technology was originally proposed by the European Broadcasting Union (EBU) Broadcast
Management Committee, who established the B/TPEG project group in the autumn of 1997 with a brief to
develop, as soon as possible, a new protocol for broadcasting traffic and travel-related information in the
multimedia environment. TPEG technology, its applications and service features were designed to enable
travel-related messages to be coded, decoded, filtered and understood by humans (visually and/or audibly
in the user’s language) and by agent systems. Originally, a byte-oriented data stream format, which can be
carried on almost any digital bearer with an appropriate adaptation layer, was developed. Hierarchically
structured TPEG messages from service providers to end-users were designed to transfer information from
the service provider database to an end-user’s equipment.
One year later, in December 1998, the B/TPEG group produced its first EBU specifications. Two documents
were released. Part 2 (TPEG-SSF, which became ISO/TS 18234-2) described the syntax, semantics and
framing structure which was used for all TPEG applications. Meanwhile, Part 4 (TPEG-RTM, which became
ISO/TS 18234-4) described the first application for road traffic messages.
Subsequently, in March 1999, CEN/TC 278, in conjunction with ISO/TC 204, established a group comprising
members of the former EBU B/TPEG and this working group continued development work. Further parts
were developed to make the initial set of four parts, enabling the implementation of a consistent service.
Part 3 (TPEG-SNI, ISO/TS 18234-3) described the service and network information application used by all
service implementations to ensure appropriate referencing from one service source to another.
Part 1 (TPEG-INV, ISO/TS 18234-1) completed the series by describing the other parts and their relationship.
It also contained the application IDs used within the other parts. Additionally, Part 5, the public transport
information application (TPEG-PTI, ISO/TS 18234-5), was developed. The so-called TPEG-LOC location
referencing method, which enabled both map-based TPEG-decoders and non-map-based ones to deliver
either map-based location referencing or human readable text information, was issued as ISO/TS 18234-6
to be used in association with the other applications of parts of the ISO 18234 series to provide location
referencing.
The ISO 18234 series has become known as TPEG Generation 1.
0.2 TPEG Generation 2
When the Traveller Information Services Association (TISA), derived from former forums, was inaugurated
in December 2007, TPEG development was taken over by TISA and continued in the TPEG applications
working group.
It was about this time that the (then) new Unified Modelling Language (UML) was seen as having major
advantages for the development of new TPEG applications in communities who would not necessarily have
the binary physical format skills required to extend the original TPEG TS work. It was also realized that the
XML format for TPEG described within the ISO 24530 series (now superseded) had a greater significance
than previously foreseen, especially in the content-generation segment, and that keeping two physical
formats synchronized, in different standards series, would be rather difficult.
As a result, TISA set about the development of a new TPEG structure that would be UML-based. This has
subsequently become known as TPEG Generation 2.
TPEG2 is embodied in the ISO 21219 series and it comprises many parts that cover introduction, rules, toolkit
and application components. TPEG2 is built around UML modelling and has a core of rules that contain the
modelling strategy covered in ISO 21219-2, ISO 21219-3 and ISO 21219-4 and the conversion to two current
physical formats: binary (see Annex A) and XML (see Annex B); others could be added in the future. TISA
uses an automated tool to convert from the agreed UML model XMI file directly into an MS Word document
file that forms the annex for each physic
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