1、International Standard 6709 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEYHAPOAHAR OPAHH3AUWR flOCTAl4 s Price based on 3 pages Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 1/13/99Published by American Na
2、tional Standards Institute,25 West 43rd Street, New York, New York 10036Copyright 2002 by Information Technology Industry Council (ITI).All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO), InternationalElectrotechnical Commission (I
3、EC), American National Standards Institute (ANSI), and Information Technology Industry Council(ITI). Not for resale. No part of this publication may be reproduced in any form, including an electronic retrieval system, withoutthe prior written permission of ITI. All requests pertaining to this standa
4、rd should be submitted to ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaCopyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Foreword IS0 (the In
5、ternational Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been
6、 authorized has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before th
7、eir acceptance as International Standards by the IS0 Council. International Standard IS0 6769 was developed by Technical Committee ISO/TC 97, Information processing systems, and was circulated to the member bodies in November 1961. It has been approved by the member bodies of the following countries
8、 : Belgium France Canada Germany, F. R. China Italy Czechoslovakia Japan Egypt, Arab Rep. of Netherlands Finland Poland Romania South Africa, Rep. of Spain Sweden United Kingdom USA No member body expressed disapproval of the document. 0 International Organization for Standardization, 1983 0 Printed
9、 in Switzerland Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD IS0 6709-1983 (E) Standard representation of latitude, longitude and altitude for geographi
10、c point locations 0 Introduction Efficient interchange of geographic point location data requires formats which are universally interpretable and which allow unique identification of points on, above or below the earths surface. Users in various disciplines may have different re- quirements. This is
11、 exemplified by the use of degrees and decimal degrees in addition to the traditional degrees, minutes and seconds for recording latitude and longitude. Users may also require different degrees of precision and may use latitude and longitude without altitude. This International Standard provides a v
12、ariable-length format which has the flexibility to cover these various requirements. Use of this International Standard will : a) reduce the cost of interchange of data; b) reduce the delay in converting non-standard coding structures in preparation for interchange by providing ad- vance knowledge o
13、f the standard interchange format. 1 Scope and field of application This International Standard specifies a variable-length format for the representation of latitude, longitude and altitude for use in data interchange. The representation of altitude is optional and its presence or absence is implici
14、t in the format. This International Standard allows the use of normal sex- agesimal notations involving degrees, minutes and seconds as well as various combinations of sexagesimal and decimal nota- tions - degrees and decimal degrees; degrees, minutes and decimal minutes; degrees, minutes, seconds a
15、nd decimal seconds. It makes use of the numeric characters 0 to 9, the graphic characters plus ( + 1, minus ( - 1, full stop (.I and com- ma (,I. This International Standard does not specify the use of fixed- length field formats which, although they may be consistent with the format in this Interna
16、tional Standard, require prior agreement between parties in the data interchange. This International Standard does not require special internal procedures, file organization techniques, storage medium, languages, etc., to be used in its implementation. 2 Requirements for the representation of latitu
17、de, longitude and altitude 2.1 Latitude 2.1.1 Latitudes north of the equator shall be designated by use of the plus sign ( + ), latitudes south of the equator shall be designated by use of the minus sign ( - 1. The equator shall be designated by use of the plus sign ( + 1. 2.1.2 The first two digits
18、 of the latitude string shall represent degrees. Subsequent digits shall represent minutes, seconds or decimal fractions according to the following convention in which the decimal mark (full stop or comma) indicates the tran- sition from the sexagesimal system to the decimal system : Degrees and dec
19、imal degrees : DD.DD Degrees, minutes and decimal minutes : DDMM.MMM Degrees, minutes, seconds and decimal seconds : DDMMSS.SS Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0
20、 6709-1963 (E) 2.1.3 Leading zeros shall be inserted for degree values less than 10, and zeros shall be embedded in proper positions when minutes or seconds are less than 10. 2.2 Longitude 2.2.1 Longitudes east of Greenwich shall be designated by use of the plus sign ( + ), longitudes west of Greenw
21、ich shall be designated by use of the minus sign (- 1. The Prime Meridian shall be designated by use of the plus sign f + 1. The 160th meri- dian shall be designated by use of the minus sign ( - 1. 2.2.2 The first three digits of the longitude string shall repre- sent degrees. Subsequent digits shal
22、l represent minutes, seconds or decimal fractions according to the following con- vention in which the decimal mark (full stop or comma) in- dicates the transition from the sexagesimal system to the decimal system : Degrees and decimal degrees : DDD.DD Degrees, minutes and decimal minutes : DDDMM.MM
23、 Degrees, minutes, seconds and decimal seconds : DDDMMSS.SS 2.2.3 Leading zeros shall be inserted for degree values less than 100, and zeros shall be embedded in proper positions when minutes or seconds are less than 10. 2.3 Altitude 2.3.1 The representation of altitude is optional. If it is represe
24、nted it shall comply with 2.3.2 and 2.3.3. 2.3.2 Altitudes above the geodetic reference datum shall be designated by use of the plus sign ( + 1, altitudes below the geodetic reference datum shall be designated by use of the minus sign ( - 1. Altitudes at the geodetic datum level shall be designated
25、by use of the plus sign ( + 1. 2.3.3 The altitude shall be represented in metres, using decimal fractions if required. NOTE - Alternatively, feet may be used, but only where specified in documentation associated with the interchange. 2.4 Format 2.4.1 Elements shall be combined in a point location st
26、ring in the sequence : a) latitude; bl longitude; cl altitude, if represented. 2.4.2 The designator ” + ” or ” - ” pertaining to any number shall be placed in the character position preceding that number. 2.4.3 The number of digits for latitude, longitude and altitude shall indicate the precision of
27、 available data. 2.4.4 Latitude and longitude for a specific point should be ex- pressed in the same format style and to the same precision. 2.4.5 There shall be no separator between the elements for latitude, longitude and altitude. NOTE - The use of designators ” + ” and ” - ” preceding the numeri
28、c part of each element permits the recognition of the start of each ele- ment and the termination of the previous one. 2.4.6 The point location string shall be terminated. The ter- minator character shall be a solidus (/I, unless otherwise specified in the documentation associated with interchange.
29、Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6706-1663 (E) 3 Examples Examples of point location strings complying with this international Standard are given below; a) to
30、f) contain only latitude and longitude, g) to n) also contain altitude. a) degrees +40-0751 b) degrees and decimal degrees + 40.20351- 075.00417/ c) degrees and minutes +4012-075001 d) degrees, minutes and decimal minutes +4012X?- 07500.25/ e) degrees, minutes and seconds +401213-0750015/ f) degrees
31、, minutes, seconds and decimal seconds +401213.1-0750015.1/ g) degrees +40-075+350/ h) degrees and decimal degrees +40.20351-075.00417+350.517/ jl degrees and minutes +4012-07500- 159.2/ k) degrees, minutes and decimal minutes +4012.22-07500.25- 169.21 m) degrees, minutes and seconds +401213-0750015+2.79/ n) degrees, minutes, seconds and decimal seconds +401213.1-0750015.1+2.79/ Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
