1、 ETSI EN 302 931 V1.1.1 (2011-07)European Standard Intelligent Transport Systems (ITS);Vehicular Communications;Geographical Area DefinitionETSI ETSI EN 302 931 V1.1.1 (2011-07) 2Reference DEN/ITS-0030021 Keywords ITS, location ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.
2、: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made a
3、vailable in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept o
4、n a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you fin
5、d errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction
6、 in all media. European Telecommunications Standards Institute 2011. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP O
7、rganizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI EN 302 931 V1.1.1 (2011-07) 3Contents Intellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references
8、5g33 Definitions and symbols . 5g33.1 Definitions 5g33.2 Symbols 6g34 Definition of geographical areas 6g34.1 Overview 6g34.2 Definition of a circular area 7g34.3 Definition of a rectangular area 7g34.4 Definition of an elliptical area 8g35 Elementary geometry . 8g35.1 Geometric function F to determ
9、ine spatial characteristics of a point P(x,y). 8g35.2 Geometric function F for a circular area 8g35.3 Geometric function F for a rectangular area . 9g35.4 Geometric function F for a elliptical area . 9g3Annex A (informative): Bibliography . 10g3History 11g3ETSI ETSI EN 302 931 V1.1.1 (2011-07) 4Inte
10、llectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rig
11、hts (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has
12、 been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (EN) has been produced by ETSI Tech
13、nical Committee Intelligent Transport System (ITS). National transposition dates Date of adoption of this EN: 19 July 2011 Date of latest announcement of this EN (doa): 31 October 2011 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 30 April 2012 Date of withdr
14、awal of any conflicting National Standard (dow): 30 April 2012 Introduction The present document specifies a method for location referencing. This method defines geographical areas by means of geometric shapes, i.e. circle, rectangle and ellipse. Furthermore, the present document introduces a functi
15、on that can be used determine the geospatial relation of a point to the geographical area (at the centre, inside, at the border, outside). ETSI ETSI EN 302 931 V1.1.1 (2011-07) 51 Scope The location referencing method enables ITS stations to exchange location-related information i.1 and i.3. It faci
16、litates communication protocols i.2 and i.4 to address geographical areas and to disseminate information in these areas. The location referencing method is designed to minimize overhead and computational complexity. Encoding and decoding of the geospatial information is beyond the scope of the prese
17、nt document. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amen
18、dments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1
19、Normative references The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a par
20、ticular subject area. i.1 ETSI TR 102 638: “Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Definitions“. i.2 ETSI TS 102 637-3: “Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Part 3: Specifications of Decentralize
21、d Environmental Notification Basic Service“. i.3 ETSI TS 102 636-3: “Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 3: Network architecture“. i.4 ETSI TS 102 636-4-1: “Intelligent Transport System (ITS); Vehicular communications; GeoNetworking; Part 4: Geographica
22、l addressing and forwarding for point-to-point and point-to-multipoint communications; Sub-part 1: Media-Independent Functionality“. 3 Definitions and symbols 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: location referencing: method for referen
23、cing a location to facilitate the exchange of location-related information ETSI ETSI EN 302 931 V1.1.1 (2011-07) 63.2 Symbols For the purposes of the present document, the following symbols apply: a the distance between the center point and the short side of a rectangle (perpendicular bisector of th
24、e long side) or the length of the short semi-axis of an ellipse b the distance between the center point and the long side of a rectangle (perpendicular bisector of the short side) or the length of the long semi-axis of an ellipse F function to determine the spatial characteristics of a point P(x,y)
25、relative to a geometric shape P(x,y) point in a Cartesian coordinate system r radius of a circle x abscissa of a Cartesian coordination system with the origin in the centre of the geographical area and parallel to the long side of a geometric shape y ordinate of a Cartesian coordination system with
26、the origin in the centre of the geographical area and parallel to the short side of a geometric shape azimuth angle of the long side of a rectangle or the long semi-axis of an ellipse zenith angle of the long side of a rectangle or the long semi-axis of an ellipse 4 Definition of geographical areas
27、4.1 Overview Geographical areas shall be specified by geometric shapes. The following geographical areas are defined: circular area; rectangular area; and elliptical area. Figure 1 depicts all shapes in a single drawing. The shapes are detailed in the following clauses. Figure 1: Overview of geometr
28、ic shapes for the definition of geographical areas ETSI ETSI EN 302 931 V1.1.1 (2011-07) 74.2 Definition of a circular area The circular area shall be described by a circular shape with a single point A that represents the center of the circle and a radius r as shown in figure 2. Figure 2: Circular
29、area 4.3 Definition of a rectangular area The rectangular area shall be defined by a rectangular shape (figure 3) with point A that represents the center of the rectangle and the following parameters: a the distance between the center point and the short side of the rectangle (perpendicular bisector
30、 of the short side); b the distance between the center point and the long side of the rectangle (perpendicular bisector of the long side); azimuth angle of the long side of the rectangle. Figure 3: Rectangular area ETSI ETSI EN 302 931 V1.1.1 (2011-07) 84.4 Definition of an elliptical area The ellip
31、tical area shall be defined by an elliptical shape (figure 4) with point A that represents the center of the ellipse and the following parameters: a the length of the long semi-axis; b the length of the short semi-axis; azimuth angle of the long semi-axis. ANorthabyxFigure 4: Elliptical area 5 Eleme
32、ntary geometry 5.1 Geometric function F to determine spatial characteristics of a point P(x,y) This clause defines a function F that an ITS station can use to determine whether a point P(x,y) is located inside, outside, at the centre, or at the border of a geographical area. The function has the fol
33、lowing properties: () =areaalgeographictheoutsideareaalgeographictheofbordertheatareaalgeographictheinsidepoint)centrethe(at0and0for0001,yxyxFwhere: x, y are the geographical coordinates of P. The function F(x,y) assumes the canonical form of the geometric shapes: The Cartesian coordinate system has
34、 its origin in the center of the shape. Its abscissa is parallel to the long side of the shapes. Point P is defined relative to this coordinate system. 5.2 Geometric function F for a circular area For a circular area the function F is defined by equation 1. 221),( =ryrxyxF (1) ETSI ETSI EN 302 931 V
35、1.1.1 (2011-07) 95.3 Geometric function F for a rectangular area For a rectangular area the function F is defined by equation 2. =221,1),(byaxMinimumyxF (2) 5.4 Geometric function F for a elliptical area For an elliptical area the function F is defined by equation 3. 221),( =byaxyxF (3) ETSI ETSI EN
36、 302 931 V1.1.1 (2011-07) 10Annex A (informative): Bibliography EU FP7 GEONET Project: “Deliverable D2.2 Final GeoNet Specification“, January 2010, ETSI Document ITSWG3(10)0011. ISO 17572-3 (December 2008): “Intelligent transport systems (ITS) - Location referencing for geographic databases - Part 3
37、: Dynamic location references (dynamic profile)“. SAE J2266 (October 2004): “Location Referencing Message Specification (LRMS)“. ISO/TS 18234-6 (June 2006): “Traffic and Travel Information (TTI) - TTI via Transport Protocol Expert Group (TPEG) data-streams - Part 6: Location referencing applications
38、“. National Imagery And Mapping Agency, Department of Defense (NIMA) Technical Report TR 8350.2: “World Geodetic System 1984“, 3rd edition, January 2000. ETSI ETSI EN 302 931 V1.1.1 (2011-07) 11History Document history V1.0.0 December 2010 Public Enquiry PE 20110405: 2010-12-06 to 2011-04-05 V1.1.0 May 2011 Vote V 20110719: 2011-05-20 to 2011-07-19 V1.1.1 July 2011 Publication
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