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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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“The Right to Information, The Right to Live”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 13393 (1992): Standard Representation of Latitude,Longitude and Altitude for Geographic Point Location [LITD14: Software and System Engineering]

Indian Standard

STANDARD REPRESENTATION OF LATITUDE, LONGITUDE AND ALTITUDE FOR GEOGRAPHIC

POINT LOCATION

UDC 911 ( 460’1/*2 j

QBIS 1992

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002 .

May 1992 Price Group 3

1s 13393 : 1992 IS0 6709 : 1983

Indian Standard

STAN.DARD REPRESENTATION OF LATITUDE, LONGITUDE AND ALTITUDE FOR GEOGRAPHIC

POINT LOCATION

NATIONAL FOREWORD

This Indian Standard which is identical with IS0 6709 : 1983 ‘Standard representation of latitude, longitude and altitude for geographic point locations’ issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on the recommendation of Information Systems and Software Sectional Committee ( LTD 33 ) and approval of the Electronics and Telecommunication Division Council.

In the adopted standard certain terminology and conventions are however not identical to those used in Indian Standards. Attention isparticularly drawn to the lollowing:

Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

1

As in the Original Standard, this Page is Intentionally Left Blank

IS 13393 : 1992 IS0 6709 : 1983

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 earth’s surface. Users in various disciplines may have different re- quirements. This is 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 variable-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 of 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 implicit 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 and decimal seconds. It makes use @T the r..rmeric 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 International 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 latitude, 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 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 decimal degrees :

DD.DD

Degrees, minutes and decimal minutes :

DDMM.MMM .

Degrees, minutes, seconds and decimal seconds :

DDMMSS.SS

IS 13393 : 1992

IS0 6709 : 1983

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 ( + 1, longitudes west of Greenwich shall be designated by use of the minus sign ( 1); The Prime Meridian shall be designated by use of the plus sign ( + 1. The 160th meri- dian shall be designated by use of the minus sign ( - I.

2.2.2 The first three digits of the longitude string shall repre- sent degrees. Subsequent digits shall 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

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 option,al. If it is represented 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 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 string in the sequence :

al

b)

c)

2.4.2

latitude;

longitude;

altitude, if represented.

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 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.

WOTE - The use of designators I’ + ” and “- ” preceding the numeric 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 documeritation associated with interchange.

.

IS 13393 : 1992 IS0 6709 : 1983

3 Examples

Examples of point location strings complying with this International Standard are given below;

a) to f) contain only latitude and longitude, g) to r-r) also contain altitude.

a) degrees +40-0751

b) degrees and decimal degrees + 40.20361- 075.00417/

c) degrees and minutes +4012-075001

d) degrees, minutes and decimal minutes + 4012.22 - 07500.251

e) degrees, minutes and seconds +401213-0750015I

f) degrees, minutes, seconds and decimal seconds +401213.1-0750015.1/

g) degrees +40-075+350/

h) degrees and decimal degrees

j) degrees and minutes

k) degrees, minutes and decimal minutes

m) degrees, minutes and seconds

n) degrees, minutes, seconds and decimal seconds

+4Q.20361-075.00417+350.517/

+4012-07500- 169.21

+4012.22-07500.25- 169.21

+401213-0750015+2.79/

+401213.1-0750015.1+2.79/

5 Reprography Unit, BIS, Neu Delhi, India

Bureau of Indian Standard

BIS is a statutory institution established under the Bureau ofZndiun Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writting of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designation. Enquiries relating to copyright be addressed’ to the Director ( Publications ), BIS.

Revision of Indian Standards

Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. sent to BIS giving the following reference:

Comments on this Indian Standard may be

Dot : No. LTD 33 ( 1541 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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