EN ISO 20524-2:2022

• Abstract:

  This document specifies the conceptual and logical data model in addition to the physical encoding formats for geographic databases for Intelligent Transport Systems (ITS) applications and services. This document includes a specification of potential contents of such databases (data dictionaries for Features, Attributes and Relationships), a specification of how these contents are to be represented, and how relevant information about the database itself can be specified (metadata). This document further defines map data used in automated driving systems, Cooperative-ITS, and Multi-modal transport.; The focus of this document is firstly on emerging ITS applications and services, such as Cooperative-ITS and automated driving systems, and it emphasizes road, lane and relevant information on road and lane. However, ITS applications and services also require other information in addition to road and road-related information, which are provided as external databases to connect with GDF and to complement each other. Highly defined public transport databases, for instance, are indispensable in multi-modal transport applications and services in particular. Thus, this document focuses secondly on an expansion of the specification to connect with externally existing databases. It is particularly designed to connect a Transmodel (EN 12896-1 and EN 12896-2) conformant public transport database.; Typical ITS applications and services targeted by this document are in-vehicle or portable navigation systems, traffic management centres, or services linked with road management systems, including public transport systems.; The conceptual data model specified here has a broader focus than ITS applications and services. It is application independent, allowing for future harmonization of this model with other geographic database standards.

• Status: Published
• Publication Date: 20-Dec-2022
• ICS: 03.220.20 - Road transport
• ICS: 35.240.60 - IT applications in transport
• Technical Committee: CEN/TC 278 - Road transport and traffic telematics
• Drafting Committee: CEN/TC 278/WG 7 - Geographic road data (GRD)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Dec-2022
• Due Date: 06-Nov-2024
• Completion Date: 21-Dec-2022
• Directive: Not Harmonized2010/40/EU - Directive 2010/40/EU of the European Parliament and of the Council of 7 July 2010 on the framework for the deployment of Intelligent Transport Systems in the field of road transport and for interfaces with other modes of transport Text with EEA relevance
• Ref Project: SIST EN ISO 20524-2:2023 - Intelligent transport systems - Geographic Data Files (GDF) GDF5.1 - Part 2: Map data used in automated driving systems, Cooperative ITS, and multi-modal transport (ISO 20524-2:2020)

• Replaces: EN ISO 14825:2011 - Intelligent transport systems - Geographic Data Files (GDF) - GDF5.0 (ISO 14825:2011)
• Effective Date: 28-Dec-2022
• Refers: ISO 639-2:1998 - Codes for the representation of names of languages — Part 2: Alpha-3 code
• Effective Date: 25-Aug-2026
• Refers: ISO 20524-1:2020 - Intelligent transport systems — Geographic Data Files (GDF) GDF5.1 — Part 1: Application independent map data shared between multiple sources
• Effective Date: 25-Aug-2026
• Refers: EN 571-1:1997 - Non destructive testing - Penetrant testing - Part 1: General principles
• Effective Date: 28-Jan-2026
• Refers: EN ISO 11855-2:2021 - Building environment design - Embedded radiant heating and cooling systems - Part 2: Determination of the design heating and cooling capacity (ISO 11855-2:2021)
• Effective Date: 28-Jan-2026
• Referred By: CEN/TS 17268:2018 - Intelligent transport systems - ITS spatial data - Data exchange on changes in road attributes
• Effective Date: 28-Jan-2026

Overview - EN ISO 20524-2:2022 (GDF GDF5.1)

EN ISO 20524-2:2022 specifies the conceptual, logical and physical data models for Geographic Data Files (GDF GDF5.1) tailored to modern Intelligent Transport Systems (ITS). It defines the structure and encoding of map data used in automated driving systems, Cooperative ITS (C-ITS), and multi-modal transport services. The standard covers data dictionaries (Features, Attributes, Relationships), metadata definitions, and mechanisms to connect GDF to external databases (for example, Transmodel‑conformant public transport databases).

Key topics and technical requirements

• Conceptual and logical data model: An application‑independent model for features, attributes, relationships, and layers to enable harmonisation with other geographic database standards.
• Physical encoding formats: Specification of how GDF content is to be packaged and exchanged for ITS applications.
• Feature Catalogue: Definitions for road‑centric objects including road belts, lane elements, intersections, road furniture, and public transport features.
• Attribute Catalogue: Standard attribute types, units, default values, multilingual naming, and value encoding rules.
• Topology and graph modelling: Road graph topology, belt concept (road/ lane abstractions), representative lines and connection points for lane‑level routing and positioning.
• Linear referencing, time and height modelling: Support for precise position referencing along roads, temporal validity and multi‑level/height representations (important for complex infrastructures).
• Metadata and data management: Rules for dataset metadata, sections, layers and sharing to support interoperability and lifecycle management.
• External database connectivity: Guidance to link GDF with specialised external datasets (notably Transmodel public transport databases) to support multi‑modal services.

Applications and typical users

Who uses this standard:

• Map data producers and GIS teams creating lane‑level and high‑definition maps for ADAS and automated driving.
• Automotive OEMs and Tier‑1 suppliers integrating map data into vehicle perception, navigation and AD stacks.
• ITS and C‑ITS service providers (e.g., cooperative traffic services, V2X) requiring standardized map semantics.
• Traffic management centres, road authorities and road‑asset managers needing interoperable datasets.
• Public transport agencies and journey‑planning providers using linked GDF + Transmodel datasets for multi‑modal routing.

Practical uses:

• High‑definition lane maps for automated driving and precise positioning.
• Cooperative traffic messaging and infrastructure-to-vehicle services.
• Multi‑modal trip planning by connecting transit schedules to lane‑level road geometry.
• Interoperable data exchange between national mapping agencies, suppliers and operators.

Related standards

• Transmodel: EN 12896-1 and EN 12896-2 (public transport data model) - referenced for multi‑modal connectivity.
• Supersedes: EN ISO 14825:2011.
• Developed under ISO/TC 204 (Intelligent Transport Systems) and adopted by CEN as EN ISO 20524-2:2022.

This standard is essential for organizations building interoperable, lane‑accurate map databases and ITS services that require consistent semantics, exchange formats and connections to transit systems.

SLOVENSKI STANDARD
01-maj-2023
Nadomešča:
SIST EN ISO 14825:2011
Inteligentni transportni sistemi - Datoteke z geografskimi podatki (GDF) - GDF5.1 -
2. del: Podatki zemljevidov, ki se uporabljajo v sistemih za avtomatizirano vožnjo,
v kooperativnem ITS in multimodalnem transportu (ISO 20524-2:2020)
Intelligent transport systems - Geographic Data Files (GDF) GDF5.1 - Part 2: Map data
used in automated driving systems, Cooperative ITS, and multi-modal transport (ISO
20524-2:2020)
Intelligente Transportsysteme - Geografische Dateien (GDF) - GDF5.1 - Teil 2:
Kartendaten, die in automatisierten Fahrsystemen verwendet werden, kooperative ITS
und multimodaler Transport (ISO 20524-2:2020)
Systèmes de transport intelligents - Fichiers de données géographiques (GDF) GDF5.1 -
Partie 2 : Données cartographiques utilisées dans les systèmes de conduite
automatisée, les ITS coopératifs et le transport multimodal (ISO 20524-2:2020)
Ta slovenski standard je istoveten z: EN ISO 20524-2:2022
ICS:
03.220.20 Cestni transport Road transport
07.040 Astronomija. Geodezija. Astronomy. Geodesy.
Geografija Geography
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20524-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 03.220.20; 35.240.60 Supersedes EN ISO 14825:2011
English Version
Intelligent transport systems - Geographic Data Files
(GDF) GDF5.1 - Part 2: Map data used in automated driving
systems, Cooperative ITS, and multi-modal transport (ISO
20524-2:2020)
Systèmes de transport intelligents - Fichiers de Intelligente Transportsysteme - Geografische Dateien
données géographiques (GDF) GDF5.1 - Partie 2 : (GDF) - GDF5.1 - Teil 2: Kartendaten, die in
Données cartographiques utilisées dans les systèmes automatisierten Fahrsystemen verwendet werden,
de conduite automatisée, les ITS coopératifs et le kooperative ITS und multimodaler Transport (ISO
transport multimodal (ISO 20524-2:2020) 20524-2:2020)
This European Standard was approved by CEN on 20 December 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20524-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20524-2:2020 has been prepared by Technical Committee ISO/TC 204 "Intelligent
transport systems” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 20524-2:2022 by Technical Committee CEN/TC 278 “Intelligent transport systems” the
secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 14825:2011.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 20524-2:2020 has been approved by CEN as EN ISO 20524-2:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 20524-2
First edition
2020-11
Intelligent transport systems —
Geographic Data Files (GDF) GDF5.1 —
Part 2:
Map data used in automated driving
systems, Cooperative ITS, and multi-
modal transport
Systèmes de transport intelligents — Fichiers de données
géographiques (GDF) GDF5.1 —
Partie 2: Partie 2 : Données cartographiques utilisées dans les
systèmes de conduite automatisée, les ITS coopératifs et le transport
multimodal
Reference number
ISO 20524-2:2020(E)
©
ISO 2020
ISO 20524-2:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 20524-2:2020(E)
Contents Page
Foreword .xi
Introduction .xii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms, symbols and notation elements . 2
4.1 Abbreviated terms . 2
4.2 Symbols and notation elements . 3
5 Overall conceptual data model . 3
5.1 Conceptual data models in GDF . 3
5.2 General data model of GDF . 4
5.2.1 Feature model. 4
5.2.2 Belt concept . 6
5.2.3 Graph topology . 7
5.2.4 Levels in GDF .13
5.2.5 Height modelling and time modelling .15
5.3 The Attribute model .16
5.4 The Relationship model .18
5.5 Linear referencing .19
5.6 The Feature representation scheme .19
5.7 Time modelling .20
5.8 Data management: organization of Feature data into Layers and Sections .21
6 Feature Catalogue .24
6.1 Generic specifications .24
6.1.1 Features and Feature Themes .24
6.1.2 Feature Class Codes .25
6.1.3 Simple and Complex Features .25
6.1.4 Feature hierarchy .25
6.1.5 Data model for the Feature Catalogue .25
6.1.6 Shareable Feature .26
6.2 Abstract Belt Feature .30
6.2.1 General.30
6.2.2 RoadBelt .33
6.2.3 RoadBeltElement .35
6.2.4 IntersectionBelt .36
6.2.5 RoundaboutBelt .38
6.2.6 LaneBeltElement.38
6.2.7 LaneBeltJoint .41
6.2.8 PotentialEvadingArea .42
6.2.9 BeltRepresentativeLine (BRL) .43
6.2.10 IntersectionConnectionPoint (ICP).45
6.2.11 LaneConnectionPoint (LCP) .45
6.2.12 BeltOptionalPoint (BOP) .45
6.2.13 BeltPartitionLine .46
6.3 Road Furniture Feature .47
6.3.1 General overview .47
6.3.2 Road Structural Component (RSC) .47
6.3.3 Road Marking-2 .48
6.3.4 Safety Fixture .50
6.4 Public Transport Feature .51
6.4.1 General overview .51
6.4.2 Public Transport Feature .53
ISO 20524-2:2020(E)
6.4.3 Public Transport Point .54
6.4.4 Public Transport Point Sequence .54
6.4.5 Public Transport Point Sequence Part .55
6.4.6 Public Transport Point Set .55
6.4.7 Public Transport Point Set Part .56
6.4.8 Public Transport Representative Point .56
6.4.9 Public Transport Zone .56
7 Attribute Catalogue .56
7.1 Generic specifications .56
7.1.1 Attribute Types.56
7.1.2 Attribute Values .57
7.1.3 Attribute Type Name .57
7.1.4 Simple Attributes, Composite Attributes and Sub-Attributes .57
7.1.5 Names in combination with a Language Code .58
7.1.6 Default Attribute Values .58
7.1.7 Default Attribute units for measures .58
7.1.8 Attribute Type Codes .58
7.1.9 User Defined Attributes .58
7.1.10 Attribute mapping to Feature Themes and Relationships .59
7.1.11 The data model for Attributes .64
7.2 Attributes .70
7.2.1 Alignment Portion Type .70
7.2.2 Applied Direction .71
7.2.3 Applied Feature Type .71
7.2.4 Applied Side Line .71
7.2.5 Approximated Curve . .71
7.2.6 Belt Overlapping .72
7.2.7 Belt Representative Line Segment Characteristic .72
7.2.8 Road Belt Element Segment Characteristic .72
7.2.9 Circular Curve Measure .73
7.2.10 Clothoid Curve Measure .73
7.2.11 Connection Type .73
7.2.12 Context Of Point .73
7.2.13 Context Of Point Set .74
7.2.14 Context Of Point Sequence .74
7.2.15 Cross-section .74
7.2.16 Design Reference .74
7.2.17 End Elevation Measure .75
7.2.18 Existence Position .75
7.2.19 Flexure Angle .75
7.2.20 Flexure Point .75
7.2.21 Gradient .76
7.2.22 Heading Angle .76
7.2.23 Height Block Characteristics .76
7.2.24 Height Block Information .77
7.2.25 Hierarchical Info .77
7.2.26 Identifier Number .77
7.2.27 Include Bicycle Lane .77
7.2.28 Intersection Category .78
7.2.29 Intersection Type .78
7.2.30 Lane Block ID .78
7.2.31 Lane Block Info .78
7.2.32 Lane Transfer Characteristic .79
7.2.33 Lane Transfer Characteristic Type .79
7.2.34 Lane Number .80
7.2.35 Lane Number Of Referencing .80
7.2.36 Lane Belt Element Segment Characteristic .80
7.2.37 Lane Width Change .81
iv © ISO 2020 – All rights reserved

ISO 20524-2:2020(E)
7.2.38 Line Code .81
7.2.39 Line Name .82
7.2.40 Line Segment Information .82
7.2.41 Linear Portion Measure .82
7.2.42 Marking Type .82
7.2.43 Maximum Tolerance .83
7.2.44 Minimum Tolerance .83
7.2.45 Number Of Lanes in Lane Section .83
7.2.46 Number Of Lane Section Block Info .83
7.2.47 Number Of Slope Measure .84
7.2.48 PEA Limitation .84
7.2.49 Public Transport Operator .84
7.2.50 Road Alignment .84
7.2.51 Road-facing Side .85
7.2.52 Road Marking Common Attribute .85
7.2.53 Road Marking Individual Attribute .85
7.2.54 Road Marking Individual Characteristics .86
7.2.55 Road Structural Component Common Attribute .86
7.2.56 Road Structural Component Individual Attribute .86
7.2.57 Road Structural Component Individual Characteristics .86
7.2.58 Safety Fixture Common Attribute .87
7.2.59 Safety Fixture Individual Attribute .87
7.2.60 Safety Fixture Individual Characteristics .87
7.2.61 Segment Direction .87
7.2.62 Slope Measure .88
7.2.63 Sub Feature Class Code (Road Furniture) .88
7.2.64 Start Elevation Measure.88
7.2.65 Traffic Restriction .88
7.2.66 Traffic Restriction Item .89
7.2.67 Traffic Restriction Type Code .89
7.2.68 Traffic Restriction Value .89
7.2.69 Transport Mode .89
7.2.70 Traverse Point Location .90
7.2.71 Transverse Slope .90
7.2.72 Type Of BeltRepresentativeLine .91
7.2.73 Type Of Public Transport Point .91
7.2.74 Type Of Public Transport Point Sequence .92
7.2.75 Type Of Public Transport Point Set .92
7.2.76 Without Road shoulder .93
7.2.77 Zone Description .93
7.2.78 Zone Name .93
8 Relationship Catalogue .93
8.1 Generic specifications .93
8.1.1 Feature and their Relationships .93
8.1.2 Relationship Types .108
8.1.3 Relationship Type Codes .108
8.1.4 Arity of a Relationship.109
8.1.5 Roles and partners of a Relationship .109
8.1.6 Homogeneous Relationships and their constraints .109
8.2 Relationship Types .110
8.2.1 Belt Representative Line Associated With Intersection Connection Point .110
8.2.2 Belt Representative Line Associated With Lane Connection Point .111
8.2.3 Belt Representative Line Characteristic.111
8.2.4 Road Belt Element Associated With Intersection Belt .112
8.2.5 Road Belt Element Ownership Of Belt Representative Line.112
8.2.6 Road Belt Element Segment Characteristic .113
8.2.7 Intersection Belt Ownership Of Belt Representative Line .114
8.2.8 Lane Belt Element Associated With Lane Belt Joint .114
ISO 20524-2:2020(E)
8.2.9 Lane Belt Element Ownership Of Belt Representative Line .115
8.2.10 Lane Belt Element Segment Characteristic .115
8.2.11 Lane Belt Joint Associated With Intersection Belt .116
8.2.12 Lane Section .116
8.2.13 Multi Public Transport Point Assignment .117
8.2.14 PEA Ownership Of Belt Representative Line .118
8.2.15 Public Transport Point In Correspondence With Road Element .118
8.2.16 Road Belt Associated With Intersection Belt .119
8.2.17 Road Belt Ownership Of Belt Representative Line .119
8.2.18 Road Furniture Along Road Belt Element .120
8.2.19 Road Furniture Along Belt Representative Line .121
8.2.20 Road Furniture Along Intersection Belt .121
8.2.21 Road Furniture Along Lane Belt Element .122
8.2.22 Road Marking Along Road Belt Element .123
8.2.23 Road Marking Along Belt Representative Line .124
8.2.24 Road Marking Along Intersection Belt .125
8.2.25 Road Marking Along Lane Belt Element .125
8.2.26 Segmented Edge Of PEA Belt .126
8.2.27 Shareable Coverage Area Linked To Shareable Point .127
8.2.28 Shareable Coverage Area Linked To Shareable Point Sequence .127
8.2.29 Shareable Coverage Area Linked To Shareable Point Set.128
8.2.30 Shareable Representative Point Linked To Shareable Point Sequence .128
8.2.31 Shareable Representative Point Linked To Shareable Point Set .129
8.2.32 Structure Along Road Belt Element .129
8.2.33 Structure Along Belt Representative Line .130
9 Feature representation rules .131
9.1 General .131
9.2 Generic specifications .131
9.2.1 Overview .131
9.2.2 Feature Categories .131
9.2.3 Types of topology .132
9.2.4 Levels of representation .132
9.2.5 Layers on level 0 .134
9.2.6 Rules for level 0 representation .134
9.3 Abstract Belt Feature .134
9.3.1 Introduction .134
9.3.2 Level 2 representation .134
9.3.3 Level 1 representation .134
9.3.4 Level 0 representation .137
9.4 Road Furniture .137
9.4.1 Level 2 representation .137
9.4.2 Level 1 representation .137
9.4.3 Level 0 representation .137
9.5 Shareable Feature .137
9.5.1 Level 2 representation .137
9.5.2 Level 1 representation .138
9.5.3 Level 0 representation .138
9.6 Public Transport Feature .138
9.6.1 Level 2 representation .138
9.6.2 Level 1 representation .138
9.6.3 Level 0 representation .138
10 Metadata Catalogue .138
11 Logi
...