Traffic and Travel Information (TTI) - TTI messages via cellular networks - Part 3: Basic information elements

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs 129-136 are the result of the splitting of WI 025 (TC Res C 1/2000) (CC/000607).
!!! Resolution BT 19/2002: Finalization of prENV ISO 14821-3 as CEN/TS 14821-3 by CMC under CA7 in English only and submission to the new translation procedure (NT/021014) !!!

Verkehrs- und Reiseinformationen (TTI)-TTI-Nachrichten über mobile - Teil 3: Grundlegende Informationselemente

Prometne in potovalne informacije (TTI) - Sporočila TTI prek celičnih omrežij – 3. del: Osnovni informacijski elementi

General Information

Status
Withdrawn
Publication Date
30-Sep-2003
Withdrawal Date
01-Dec-2014
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
11-Nov-2014
Due Date
04-Dec-2014
Completion Date
02-Dec-2014

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SLOVENSKI STANDARD
SIST-TS CEN/TS 14821-3:2003
01-oktober-2003

3URPHWQHLQSRWRYDOQHLQIRUPDFLMH 77, 6SRURþLOD77,SUHNFHOLþQLKRPUHåLM±

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Traffic and Travel Information (TTI) - TTI messages via cellular networks - Part 3: Basic

information elements
Verkehrs- und Reiseinformationen (TTI)-TTI-Nachrichten über mobile - Teil 3:
Grundlegende Informationselemente
Ta slovenski standard je istoveten z: CEN/TS 14821-3:2003
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
SIST-TS CEN/TS 14821-3:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 14821-3:2003
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SIST-TS CEN/TS 14821-3:2003
TECHNICAL SPECIFICATION
CEN/TS 14821-3
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
May 2003
ICS 35.240.60
English version
Traffic and Travel Information (TTI) - TTI messages via cellular
networks - Part 3: Basic information elements

This Technical Specification (CEN/TS) was approved by CEN on 10 May 2001 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their

comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available. It

is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible

conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 14821-3:2003 E

worldwide for CEN national Members.
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Table of contents
PAGE
TABLE OF CONTENTS 2
FOREWORD 4
INTRODUCTION 5
1. SCOPE 6
2. NORMATIVE REFERENCES 7
3. DEFINITIONS AND ABBREVIATIONS 8
3.1 Definitions 8
3.2 Abbreviations 10
4. GENERAL DEFINITIONS AND INFORMATION ELEMENTS 15
4.1 Absolute Time 15
5. AREA AND LOCATION CODING 17
5.1 General Format 17
5.2 WGS 84 17
5.3 ILOC 25
5.4 TMC-Location 25
6. COMMUNICATION ADDRESS 27
6.1 Network ID 28
6.2 Validity Range of Address 28
6.3 Flag BCD/ASCII 29
6.4 Address Length 29
6.5 Address 29
7. TEXT AND TRANSPARENT DATA 30
7.1 Format of a Text Element 30
8. EXTENDED LOCATION BLOCK 34
8.1 Number of ELB-Waypoints - 134
8.2 Time Difference between Generation Time and ELB-Waypoint 1 34
8.3 ELB-Waypoint X 34
8.4 Flag: GPS Raw Data Present 37
8.5 GPS Raw Data 37
9. BREAKDOWN REASONS 39
10. MASTER DATA 43
10.1 Colour of Vehicle 43
10.2 Vehicle Identification Number - VIN 43
10.3 Vehicle Model 43
10.4 Year of Construction 43
10.5 Licence Plate 43
11. GEOCODES - CONTENTS AND STRUCTURING OF TERMINAL TABLES 44
11.1 Coverage of terminal table 44
11.2 Coding table for terminal devices 44
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11.3 Geocoding 55
12. EVENT CODES 58
12.1 Introduction 58
12.2 Description of the event code structure 58
12.3 Quantifiers 58
12.4 Description of the terminal device table 59
12.5 Assignment of Event Codes and Quantifiers 60
13. CODING OF NUMBERS 75
13.1 Unsigned Integers 75
13.2 Signed Integers 75
13.3 Binomially Coded Numbers 75
14. SPECIFICATION IN ASN.1 76
BIBLIOGRAPHY 91
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Foreword

This document(CEN/TS 14821-3:2003) has been prepared by Technical Committee CEN/TC 278 " Road

transport and traffic telematics ", the secretariat of which is held by NEN, in collaboration with Technical

Committee ISO/TC 204 " Transport information and control systems ".
This was prepared by Working Group 7 of CEN TC278. In the field of Traffic and
Technical Specification

Traveller Information, the innovative rate is high, with many research and development projects under way

in many countries, and there is a need to establish prospective standards which allow manufacturers to

introduce competitive products to the market in the knowledge that they can accommodate the future issues

of the standard(s) without fundamental change to equipment.
No known national s (identical or conflicting) exist on this subject.
Technical Specification

CEN/TS 14821 consists of eight parts; one part describing the framework and seven parts providing

detailed specifications of all components, protocols and services that are within the scope of CEN/TS

14821.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to announce this Technical Specification: Austria, Belgium, Czech Republic, Denmark,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,

Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
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Introduction

Traffic and Traveller Information (TTI) may be disseminated through a number of services or means of

communication, covering static displays, portable terminals and in-vehicle equipment.

For all such services, the data to be disseminated, and the message structure involved in the various

interfaces, require clear definition and standards formats in order to allow competitive products to operate

with any received data.

This focuses on an application data specification whereby data is produced at a

Technical Specification

central location and is disseminated via a cellular radio network. It addresses the data specifications for

both downlink and uplink existing between a central location and randomly located vehicles. It enables

messages to be exchanged between different systems and service providers adopting a variety of

applications specifications.
Other s are being produced by the CEN TC278 Working Group 4 to cover TTI
Technical Specification

dissemination via other means or services. This set of specifications is named GATS (Global Automotive

Telematics Standard). GATS provides the modular framework for implementing such traffic telematics

services on an open technology platform and is network - independent. In many details definitions are

necessary to ensure interoperability. Therefore, those detailed definitions are given in CEN/TS 14821-8.

With the development of future mobile communication systems towards UMTS / IMT2000 the bottleneck of

narrow-band data communication might fade. Due to its modular structure, the GATS framework and

applications are prepared for that due to its network-independence. The same holds for emerging

technologies for positioning which today is almost exclusively based on GPS.

Other relevant standard developments are, independent from telematics, the application-independent

Wireless Application Protocol (WAP), enabling mobile access to the Internet. It is understood that these

emerging technologies might fit into the framework of telematics applications in future WAP-versions. For

the time being, GATS already today independently from WAP enables access to telematics services.

Utilisation of GATS on a WAP protocol stack and identifying necessary adaptation of WAP specifications (if

any) is currently under investigation of the appropriate groups within WAP-Forum and GATS-Forum.

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1. Scope

This defines the specific interfaces and functionality of traffic telematics (TT)

Technical Specification

services based on the use of cellular networks. Device manufacturers are enabled to develop terminal

equipment compatible to services based on this . This will allow for interoperability of

Technical Specification

different terminal equipment and service providers which allows competition between service providers and

terminal manufacturers. Furthermore it sets the scene for international availability of these services.

This specifies
Technical Specification

• TT-specific interfaces between terminal and service centre. This especially incorporates the message

sets of the application data protocols and the service-independent communication handling (including

conditional access and transport protocols).

• Functionality, procedures and requirements of basic terminal components as well as their interaction

with the service centre. This especially comprises conditional access and security mechanisms.

• Service Specifications, which are essential to ensure consistent behaviour of terminal and service

centre.
The services incorporated within this issue comprise:
• breakdown and emergency services
• interactive traffic information services
• broadcast traffic information services
• navigation services (route assistance, route advice, homing)
• operator services
• general information services
• floating car data collection

It is envisaged that future research and development will lead to improvements on the services listed above

as well as to the creation of new services. Nevertheless this Technical Specification provides the framework

for seamless integration of new features and services into the existing architecture.

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2. Normative references

This incorporates by dated or undated reference, provisions from other publications.

Technical Specification

These normative references are cited at the appropriate places in the text and the publications are listed

hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply

to this only when incorporated in it by amendment or revision. For undated
Technical Specification
references the latest edition of the publication referred to applies.

EN ISO 14819-2 Traffic and Traveller Information (TTI) - TTI Messages via traffic message coding -

Part 2: Event and information codes for Radio Data System - Traffic Message Channel (RDS-TMC) (ISO

14819-2:2003)
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3. Definitions and abbreviations
3.1 Definitions

For the purposes of this Technical Specification, the following terms and definitions apply:

3.1.1 Attribute (of a Traffic Information Message)

A Traffic Information Message is made up of separate parts that can be called attributes. This includes, for

example, an item of information and a length of validity.
3.1.2 Authorisation

Reciprocal proof that the identity provided by the communications partner is valid

3.1.3 Broadcast Service

Data service within a cellular wireless network that allows for mono-directional dissemination of data from a

service centre to multiple users in the area of signal reception
3.1.4 Bypass Description
Representation of a Bypass, consisting of a Bypass Hint and/or a Bypass Route.
3.1.5 Bypass Hint
Representation of a hint for a Bypass
3.1.6 Bypass Link
Prominent waypoints on a Bypass Route
3.1.7 Bypass Route
Representation of the route for a Bypass
3.1.8 Cell Broadcast
Broadcast service of the GSM network
3.1.9 Data telegram
Digital message exchanged between two systems
3.1.10 Delivery Notification

Network acknowledgement for successful/ unsuccessful delivery of a message to the mobile device

3.1.11 Functional Road Class

A classification based on the importance of the road element in the connectivity of the total road network

3.1.12 Functional Road Class 0
Motorways
3.1.13 Functional Road Class 1

All non-Motorways that are part of a connection used for nation wide traffic and transport

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3.1.14 Geocode

Geocodes are unique identifiers unmistakably defining important points on road networks. Geocodes can

be derived from / converted into WGS84 co-ordinates by the algorithm described in ENV ISO 14821 3.

3.1.15 Hardware service agents

Partner companies of the traffic telematics service providers who are authorised to install onboard

equipment into vehicles and to maintain it
3.1.16 Homing
Simple form of guidance to destination, in which the direction and
straight-line distance of the destination are indicated
3.1.17 Information Element
Information unit of a message
3.1.18 Intersection
Junction of two or more roads
3.1.19 Length of a Speech Report
Length of a Speech Report, including pauses, in tenths of a second
3.1.20 Mobile Originated
Data telegram sent from the onboard equipment to the Service Centre.
3.1.21 Mobile Terminated
Data telegram sent by the Service Centre to the onboard equipment.
3.1.22 Onboard equipment

A system, generally mobile, interacting with the service centre to handle traffic telematics services

3.1.23 Road Junction
Intersection of two or more roads
3.1.24 Route description

Description of a route showing the geometry of street intersections, manoeuvre instructions, street and

place names, and geographical co-ordinates
3.1.25 Service centre

System produced by the traffic telematics operators / service providers to handle traffic telematics services

3.1.26 Short Message Service
Packet-based form of data transfer within the GSM network
3.1.27 Speech connection

Communications channel between two systems for the bi-directional transmission of speech

3.1.28 Speech Report
Traffic Information Report transmitted by a speech system
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3.1.29 Terminal Device

Generally mobile system interacting with the service centre for implementation of telematics services

3.1.30 TINFO
Traffic Information Report
3.1.31 TINFO Version

Unique identification of a Traffic Message, consisting of a number and a time stamp

3.1.32 Traffic Data
Data for qualification of Traffic Events. This includes:
Values: speed, traffic flow, traffic density
Places: position, place designation
Facts: description of situation
3.1.33 Traffic Event

An occurrence on a road or in an area that is worthy of reporting, such as a traffic jam, wrong-way driver, or

fog.
3.1.34 Traffic Information

Technical representation of a Traffic Situation within the onboard equipment, accomplished by a number of

Traffic Information Reports.

This Traffic Information can be displayed to the customer via suitable terminals.

3.1.35 Traffic Information Report
Technical representation of a Traffic Event produced by processing traffic data.

Each Traffic Reports uniquely identified by a number, the TINFO ID, a time stamp, the TINFO version.

Note: If the Traffic Event changes, the time stamp changes, but the TINFO ID number does not.

3.1.36 Traffic Situation

The total number of all Traffic Events taking place that deserve reporting within an area. The Traffic

Situation is always linked to an area. Thus, for example, an areas could be a conurbation or a geometrically

demarcated area; an example is the radius around a point.
3.1.37 Voice connection

Circuit-switched channel between two systems for bi-directional voice transmission

3.1.38 Waypoint
Significant points on the route
3.2 Abbreviations

For the purposes of this Technical Specification, the following abbreviations apply:

3.2.1 % ott
percent of the time
3.2.2 ADP
Application Data Protocol, i.e. a message set for a telematics service
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3.2.3 AM
Acknowledge Message
3.2.4 ASN.1
Abstract Syntax Notation
3.2.5 BC
Broadcast
3.2.6 BCS
Broadcast Service
3.2.7 CA
Conditional Access
3.2.8 CAS
Conditional Access and Security
3.2.9 CB
Cellular Broadcast
3.2.10 CBC
Cipher Block Chaining
3.2.11 CLI
Calling Line Identification
3.2.12 CRM
Calling Request Message
3.2.13 CSD
Circuit Switched Data
3.2.14 DES
Data Encryption Standard: symmetrical encryption procedure
3.2.15 DRM
Digital Road Map
3.2.16 DSC
Data Service Centre: depending on the mobile communication network
3.2.17 ELB
Extended Location Block
3.2.18 FCD
Floating Car Data
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3.2.19 FCDGM
FCD General Message
3.2.20 FCDPM
FCD Parameter Message
3.2.21 FCDNSM
FCD Notification Set-up Message
3.2.22 FCDRM
FCD Revoke Message
3.2.23 FCDVDSUM
FCD Virtual Detection Site Update Message
3.2.24 GATS
Global Automotive Telematics Standard
3.2.25 GEM
General Error Message
3.2.26 GPS
Global Positioning System NAVSTAR GPS
3.2.27 GSM
Global System for Mobile Communication
3.2.28 IE
Information Element
3.2.29 ICV
Initial Chaining Value
3.2.30 L_max
Max. length of transferable data in one data transaction
3.2.31 MAC
Message Authentication Code
3.2.32 MNA
Mobile Network Address
3.2.33 MF
Mandatory Fixed format
3.2.34 MO
Mobile Originated Message
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3.2.35 MT
Mobile Terminated Message
3.2.36 MV
Mandatory Variable format
3.2.37 N_min
Minimum number of ELB waypoints
3.2.38 OBU
Onboard Unit, synonymously used telematics device, telematics terminal
3.2.39 OF
Optional Fixed format
3.2.40 OV
Optional Variable format
3.2.41 PDU
Protocol Data Unit
3.2.42 PFA
Probability of false alarm (i.e. estimated error is too large)
3.2.43 PMD
Probability of missed detection (i.e. estimated error is too small)
3.2.44 RSA
Asymmetrical encryption procedure by Rivest, Shamir and Adleman
3.2.45 SAE
Society of Automotive Engineers, Inc.
3.2.46 SMS
Short Message Service
3.2.47 SMSC
SMS Centre
3.2.48 SV
Space Vehicle
3.2.49 TEG
Telematics Expert Group – Group within the WAP-Forum Ltd.
3.2.50 TINFO
Traffic Information Report
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3.2.51 TOC
Telematics Operator Code
3.2.52 TRP
Transport Protocol
3.2.53 TT
Traffic telematics
3.2.54 TTI
Traffic and Traveller Information
3.2.55 TTFF
Time to First Fix
3.2.56 UTC
Universal Time Co-ordinated
3.2.57 VDS
Virtual Detection Site
3.2.58 vel, V
Velocity
3.2.59 VIN
Vehicle Identification Number
3.2.60 WAP
Wireless Application Protocol
3.2.61 WGS84
World Geodetic System 84
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4. General Definitions and Information Elements
4.1 Absolute Time
4.1.1 General

Absolute time stamps are transmitted in a unified format which allows to specify date and time with a

resolution of 1 second. The basis for the time referencing is UTC. Therefore time zones are not

distinguished.

Each time reference is given with the elements year, month, day (of month), hour, minute and second. The

coding of these elements is shown in the subsequent sections. The definition of bit order is given in 4.3.2 of

ENV 14821-1.
4.1.2 Year
Table 4-1: Coding Format for the Year IE
Value Coding Year
0 0 0 0 0 0 0 1990
1 0 0 0 0 0 1 1991
 
63 1 1 1 1 1 1 2053
4.1.3 Month
Table 4-2: Coding Format for the Month IE
Value Coding Month
0 0 0 0 0 Reserved
1 0 0 0 1 January
 
12 1 1 0 0 December
13 - 15 1 1 0 1 - 1 1 1 1 Reserved
4.1.4 Day
Table 4-3: Coding Format for the Day IE
Value Coding Day
0 0 0 0 0 0 Reserved
1 0 0 0 0 1 1.
 
31 1 1 1 1 1 31.
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4.1.5 Hour
Table 4-4: Coding Format for the Hour IE
Value Coding Hour
0 0 0 0 0 0 0
1 0 0 0 0 1 1
 
23 1 0 1 1 1 23
24 - 31 1 1 0 0 0 - 1 1 1 1 1 Reserved
4.1.6 Minute
Table 4-5: Coding Format for the Minute IE
Value Coding Minute
0 0 0 0 0 0 0 0
1 0 0 0 0 0 1 1
 
59 1 1 1 1 0 0 59
60 - 63 1 1 1 1 0 1 - 1 1 1 1 1 1 Reserved
4.1.7 Second
Table 4-6: Coding Format for the Second IE
Value Coding Minute
0 0 0 0 0 0 0 0
1 0 0 0 0 0 1 1
 
59 1 1 1 1 0 0 59
60 - 63 1 1 1 1 0 1 - 1 1 1 1 1 1 Reserved
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5. Area and Location Coding
5.1 General Format

Area coding used to define some specific geographical positions, areas etc. For TTI, several distinct

formats are used to describe locations, depending on the nature of the location and system requirements.

For this reason a location reference always consists of two parts:
a location type IE, which defines the method of coding and

a location IE, which contains the information coded according to the corresponding location type.

The definition of bit order is given in ENV 14821-1.
Four different location types are distinguished according to Table 5-1.
Table 5-1: Defined values for Location Type
Value Code Location Type
00 0 ILOC
10 1
WGS 84 (low resolution: » 50 m)
21 0
WGS 84 (high resolution » 1 m)
31 1
TMC-Location

For each of the four location types there is an appropriate definition for the location field.

5.2 WGS 84

The location coding is done by means of WGS84 coordinates (latitude, longitude) to define points.

Additionally length parameter and angles may occur.

A number of different shapes are defined to allow for flexible location referencing. They are distinguished by

the area type identifier as first IE of each element. The following shapes are defined:

Table 5-2: Definition of Area Types
Shape Area Type
Point (latitude, longitude) 0 0 0 0
Circle 0 0 0 1
Ellipse 0 0 1 0
Square 0 0 1 1
Rectangle 0 1 0 0
Polygon / Polygonal Line 0 1 0 1
Corridor 0 1 1 0
Sector 0 1 1 1
reserved 1000 - 1111

The formats for low and high resolution differ only in the word lengths of latitude and longitude. Therefore

the coding is described for both resolutions together.
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5.2.1 Parameter Coding
5.2.1.1 Coordinates for Low Resolution
Only WGS84-coordinates are given in TTI messages.

The Longitude may vary in the range -180° … +180°. 0° corresponds to the Greenwich Meridian. Positive

numbers correspond to east, negative numbers to west longitude.

The Latitude may vary in the range -90° … +90°. -90° corresponds to the south pole, 0° to the equator and

+90° to the north pole.
-11

The coordinates are transmitted as binary numbers (2-complement) in units of 2 degrees, which

corresponds to approximately 54 m in north direction. The resolution in longitude is approximately 54 m at

the equator, 46 m at 30° latitude (central europe) and 18 m at 70° latitude. The field width is 20 bits for each

coordinate.
5.2.1.2 Coordinates for High Resolution
Only geographical WGS84-coordinates are given in TTI messages.

The Longitude may vary in the range -180° … +180°. 0° corresponds to the Greenwich Meridian. Positive

numbers correspond to east, negative numbers to west longitude.

The Latitude may vary in the range -90° … +90°. -90° corresponds to the south pole, 0° to the equator and

+90° to the north pole.
-17

The coordinates are transmitted as binary numbers (2-complement) in units of 2 degrees which

corresponds to approximately 0.85 m in north direction. The field width is 26 bit for each coordinate.

5.2.1.3 Length Parameter

All width parameters are given in metres. The coding is in binomial form (see 13) with parameters

C = 10 m
x = 01.

The transmitted value N is coded in 7 bits (0 £ N £ 127). This results in a range of possible lengths between

1 m and 1807 km. (N=0 leads to l=0, which may lead to a degradation of geometrical shapes)

5.2.1.4 Angles

Angles are given in degrees with a resolution of 1°. The range is 0° … 360° leading to a field width of 9 bit.

The coding is done as an unsigned integer (binary number). The angles are measured in clockwise

direction.
5.2.2 Definition of Shapes
5.2.2.1 Point

A point is described by the two coordinates (WGS 84: latitude and longitude). The coding of the location is

summarized in Table 5-3.
Table 5-3: Coding of Location IE in case of a point (WGS84-Position)
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
Area Type MF 4 4
Longitude MF 20 26
Latitude MF 20 26

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2.

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5.2.2.2 Circle

A circle is defined by the geographical coordinates of its center (WGS 84) and the radius (half-diameter =

d/2) as illustrated in Figure 5-1.
Figure 5-1 : A circle described by its centre and radius
d/2
The coding of the location is summarized in Table 5-4.
Table 5-4: Coding of Location IE in case of a circle
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
Area Type MF 4 4
Center: Longitude MF 20 26
Center: Latitude MF 20 26
Radius (d/2) MF 7 7

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2. The radius IE is coded

according to 5.2.1.3.
5.2.2.3 Ellipse

An ellipse may have arbitrary eccentricity and orientation. It is defined by its center, a major half axis (a), a

minor half axis (b) and the angle between the north direction and the major half axis, see Figure 5-2.

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Figure 5-2: Definition of an Elipse
North
The coding of the location is summarized in Table 5-5.
Table 5-5: Coding of Location IE in case of an ellipse
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
Area Type MF 4 4
Center: Longitude MF 20 26
Center: Latitude MF 20 26
Major Half Axis (a) MF 7 7
Minor Half Axis (b) MF 7 7
Angle between Major Half Axis and MF 9 9
North direction (j)

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2. The coding for the half

axes is accorcing to 5.2.1.3 and for the angle according to 5.2.1.4.
5.2.2.4 Square

A square is defined by the coordinates of the center and the half width a/2. The sides lay in north-south and

east-west direction as illustrated in Figure 5-3.
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SIST-TS CEN/TS 14821-3:2003
CEN/TS 14821-3:2003 (E)
Figure 5-3: Definition of a square
w/2
The coding of the location is summarized in Table 5-6.
Table 5-6: Coding of Location IE in case of a square
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
Area Type MF 4 4
Center: Longitude MF 20 26
Center: Latitude MF 20 26
Half-Width (w/2) MF 7 7

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2. The coding for the half

axes is accorcing to 5.2.1.3.
5.2.2.5 Rectangle

A rectangle may have an arbitrary orientation. It is defined by its center, a major half axis (a/2), a minor half

axis (b/2) and the angle between the north direction and the major half axis (j), see Figure 5-4.

Figure 5-4: Definition of a rectangle
North
a/2
b/2
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SIST-TS CEN/TS 14821-3:2003
CEN/TS 14821-3:2003 (E)
The coding of the location is summarized in Table 5-7.
Table 5-7: Coding of Location IE in case of a rectangle
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
Area Type MF 4 4
Center: Longitude MF 20 26
Center: Latitude MF 20 26
Major Half-Side (a/2) MF 7 7
Minor Half-Side (b/2) MF 7 7
Angle between Major Half-Side and MF 9 9
North direction (j)

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2. The coding for the

half-sides is accorcing to 5.2.1.3 and for the angle according to 5.2.1.4.
5.2.2.6 Polygon / Polygonal Line

A polygon is defined by a series of points. The number of points may vary in the range 1 … 16. The points

are connected in the order they appear in the message.

This shape can be used to describe polygons (closed) as well as a polygonal line (open). They are

distinguished using the Open/Closed-Flag. In case of a polygon the last point is connected to the first one.

For both cases examples are given in Figure 5-5.
C D
Figure 5-5: Definition of a Polygon / Polygonal Line
The coding of the location is summarized in Table 5-8.
Coding of Location IE in case of a Polygon / Polygonal Line
Table 5-8:
Information Element Type Length (bits) for Length (bits) for
Low Resolution High Resolution
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SIST-TS CEN/TS 14821-3:2003
CEN/TS 14821-3:2003 (E)
Area Type MF 4 4
Open/Closed-Flag MF 1 1
Number of Points MF 4 4
1. Point: Longitude MF 20 26
1. Point: Latitude MF 20 26
Point N: Longitude MF 20 26
Point N: Latitude MF 20 26

The coding of latitude and longitude is performed according to 5.2.1.1 resp. 5.2.1.2.

5.2.2.6.1 Open/Closed--Flag

The flag determines, wether the last point is connected to the first one (polygon) or not (polygonal line).

Table 5-9: Flag Open/Closed
Value Open/Closed-Flag Type of shape
0 Open (polygonal line)
1 Closed (polygon)
5.2.2.6.2 Number of Points
The Number of points is given as a binary number. The maximum value of N=16
...

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