1252.0 - National Localities Index, Australia - ASGC, 2002  
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 15/07/2002   
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CHAPTER 1 INTRODUCTION


GEOGRAPHIC CODES FOR ADDRESSES

The National Localities Index (NLI) has been developed by the Australian Bureau of Statistics (ABS) to assist users to enhance the usefulness of their address based data by assigning Australian Standard Geographical Classification (ASGC) Main Structure codes.

The ASGC is an ABS classification which provides a hierarchy of geographic area codes used to classify a wide range of social and economic data.

The NLI also includes postcodes as these are a feature of address information. Postcodes for Localities are allocated by Australia Post. New and updated postcode information is incorporated into the Localities Index of the NLI on a regular basis.

The geographic codes available from the NLI are:

  • Main Structure codes and names of the ASGC edition current at its release - see chapter 2.
  • Australia Post postcodes.


PURPOSE OF THE NLI

The NLI is used within the ABS to assign geographic codes to statistical units in several collections including Health and Vitals and the Census of Population and Housing. It is also used by many clients and government agencies to code their own address information to the geographical units of the ASGC.

Date of effect

The NLI reflects the codes and names of the ASGC edition current at its release. Each edition of the ASGC becomes effective on 1 July of the year in question.


LOCALITIES AND STREETS

The NLI contains information about Localities across Australia and consists of two parts:
  • a Localities Index; which is linked to
  • a Streets Sub-Index - see chapters 3 and 4.

Definition of Locality

In order to keep the NLI as comprehensive as possible, the definition of ‘Locality’ has been made very broad. A Locality is defined as the name of a place where people live or work - or say they live or work.

A Locality may be treated as if it has wider boundaries than those which have been officially gazetted.

A Locality may exist across more than one ASGC area. In these instances, the Locality is described as being ‘split’. Split Localities are linked to the Streets Sub-Index where each street and its street number range is coded to its respective ASGC code.


CHAPTER 2 AUSTRALIAN STANDARD GEOGRAPHICAL CLASSIFICATION (ASGC)


MAIN STRUCTURE OF THE ASGC

The Main Structure of the ASGC is used to collect and disseminate a broad range of ABS social, demographic and economic statistics. These are statistics with a ‘where’ dimension.

The ASGC Main Structure code to which a Locality is coded has nine digits. It comprises codes representing the top four hierarchical levels of the Main Structure.

The four hierarchical levels are:
        • State/Territory (S/T);
        • Statistical Division (SD);
        • Statistical Subdivision (SSD); and
        • Statistical Local Area (SLA).

In this structure, the SLAs aggregate to form SSDs which in turn aggregate to form SDs and the SDs aggregate to form S/Ts. All levels cover the whole of Australia without gaps or overlaps.

Details of the ASGC are available in the publication Australian Standard Geographical Classification (ASGC) (Cat. no. 1216.0).

State/Territory (S/T) (1 digit code)
The S/T is identified by a unique one digit code and is the first digit or component of the nine digit ASGC code. The S/T is the largest spatial unit in the Main Structure. Codes for the States and Territories in Australia are as follows:

1 New South Wales
2 Victoria
3 Queensland
4 South
Australia
5 Western
Australia
6 Tasmania
7 Northern
Territory
8 Australian
Capital Territory
9 Other
Territories

S/Ts consist of one or more SDs and cover the whole of Australia (as defined for statistical purposes) without gaps or overlaps. They encompass the geographic areas of the Australian States, mainland Territories and the external Territories of Christmas Island and Cocos (Keeling) Islands. ‘Other Territories’ is an aggregate, for statistical purposes, of the external Territories and Jervis Bay Territory.

Statistical Division (SD) (2 digit code)
SDs are large regional type spatial units and aggregate to form S/Ts. Any one SD consists of one or more SSDs. They cover, in aggregate, the whole of Australia without gaps or overlaps. The two digit SD code must be used with the relevant S/T code for unique identification Australia-wide.

Statistical Subdivision (SSD) (2 digit code)
SSDs are smaller regional type spatial units and aggregate to form SDs. Any one SSD consists of one or more SLAs. They cover, in aggregate, the whole of Australia without gaps or overlaps. SSD codes are unique within each SD. The two digit SSD code must be used with the relevant SD and S/T code for unique identification Australia-wide.

Statistical Local Area (SLA) (4 digit code)
The SLA is the smallest spatial unit for the compilation and publication of economic, social and demographic statistics other than those collected in population censuses. SLAs can be local government areas, or parts thereof, or any unincorporated area. They cover, in aggregate, the whole of Australia without gaps or overlaps. The four digit SLA code must be preceded by at least the S/T code for unique identification Australia-wide.


Example of ASGC code
The ASGC code 110051720 can be broken down as follows:

S/TSDSSDSLA

1
NewSouthWales
10
Hunter
05
Newcastle
1720
Cessnock (C)


CHAPTER 3 LOCALITIES INDEX

The Localities Index is a comprehensive list of Localities across Australia together with their Australian Standard Geographical Classification (ASGC) Main Structure codes current at the time of release and postcodes.

SPLIT LOCALITIES

Approximately 5% of the Localities listed lie across two or more Statistical Local Areas (SLAs) and are referred to as ‘split Localities’. Split Localities are those on the Localities Index which have more than one ASGC code.

Link to Streets Sub-Index
Addresses in split Localities can be coded to their correct SLA codes by means of the Streets Sub-Index (please see chapter 4).

LOCALITIES INDEX FILE FORMAT

The standard format for the Localities Index is a comma delimited ASCII text file with fixed length fields and a record length of 157 characters. This format is suitable for uploading to either micro or mainframe computers. The standard file format and example records are described below.


FIELD NAME*
START COLUMN
FIELD LENGTH
TYPE

Locality Name
1
40
alpha
Property Indicator (PI)
42
1
alpha
Postcode 1 (PC1)
44
4
numeric
Postcode 2 (PC2)
49
4
numeric
S/T Code
54
1
numeric
ASGC Code Major SLA
56
8
numeric
ASGC Code 2nd SLA
65
8
numeric
ASGC Code 3rd SLA
74
8
numeric
ASGC Code 4th SLA
83
8
numeric
ASGC Code 5th SLA
92
8
numeric
ASGC Code 6th SLA
101
8
numeric
ASGC Code 7th SLA
110
8
numeric
ASGC Code 8th SLA
119
8
numeric
Major SLA Name
128
30
alpha

*Fields are separated by a comma.

Example:

Locality Name
PI
PC1
PC2
S/T
Major SLA
2nd SLA (etc)
Major SLA Name

ABINGTON
,
,4660
,
,3
,15104000
,
,ISIS (S)
ACACIA DOWNS
,P
,4726
,
,3
,35050150
,
,ARAMAC (S)
ACACIA RIDGE
,
,4110
,
,3
,05051001
,05051552
,ACACIA RIDGE
ALBION
,
,4010
,
,3
,05051004
,05051634
,ALBION


All names on the National Localities Index are in CAPITALS. Output files are sorted by S/T and Locality Name.


FIELD NAMES AND DEFINITIONS

The following field names and definitions describe the information contained in the Localities Index. The Localities Index is subject to other rules which govern data representation and these are explained in Appendix 1.

Locality Name
A Locality may be a city, town, suburb, neighbourhood or commonly used location name such as a large agricultural property or railway siding. Also included are some commonly used alias or unofficial Locality names. Where a Locality crosses an S/T border, the two sides of the border are recorded as two separate Localities. For example Williamsdale crosses the S/T border between New South Wales and the Australian Capital Territory and is shown on the NLI as follows:


Locality Name
PI
PC1
PC2
S/T
Major SLA
2nd SLA (etc)
Major SLA Name

WILLIAMSDALE
,
,2620
,
,1
,45058651
,
,YARROWLUMLA (A) -PT A
WILLIAMSDALE
,
,2620
,
,8
,05258189
,
,TUGGERANONG -SSD BAL



Property Indicator
The Property Indicator field was originally created to flag Localities that are properties (P) and/or Localities with no postal service (N). The N flag is no longer used as all Localities are now allocated a postcode. Current indicators in this field are:

P = property
S
= railway siding
(blank)
= default

Postcode 1 and Postcode 2
These fields record the Australia Post postcode(s) for the Locality. Generally Localities have only one postcode, however there are a small number of Localities where mail delivery is shared by two Post Offices. Recording the postcode in the National Localities Index helps to differentiate between Localities with the same name in the same State.

S/T Code
The S/T code indicates the State or Territory in which the Locality exists. Please refer to chapter 2, for more details on S/T.

ASGC Code Major SLA
The code of the Major SLA is an eight digit code made up of the Statistical Division (SD), Statistical Subdivision (SSD) and SLA codes (each of these components is described in chapter 2). This eight digit code should be used in conjunction with the S/T code for unique Australia-wide identification of the SLA. For non-split Localities this is the only ASGC code. For split Localities the Major SLA is the SLA which contains the greatest number of streets for the Locality.

ASGC Codes 2nd to 8th SLAs
These fields are used for Localities which are in more than one SLA. The codes for each of these SLAs comprise eight digits made up of the SD, SSD and SLA codes (each of these components is described in chapter 2). If a Locality is split all appropriate codes (up to eight) are listed against the Locality.

Major SLA Name
This is the SLA name for the ASGC code shown in the Major SLA field.


CODING TO STATISTICAL LOCAL AREA

In the diagram below, the localities labelled First Locality and Second Locality are shown bounded by dashed lines. They do not cross any S/T border.

First Locality is entirely within the boundary of SLA 1. It is not split and there will be no street records for it in the NLI Streets Sub-Index. The Localities Index record for First Locality will show one SLA code, i.e. all addresses in this Locality will have the same SLA code.

Second Locality shows a street pattern within it and one of the streets is named Split Street.

The boundary between SLA 1 and SLA 2 crosses through Second Locality and therefore this Locality is a split Locality. The NLI Localities Index shows both SLAs against the Locality record. SLA 1 will be the Major SLA as it has the largest number of streets for Second Locality.

All streets for Second Locality are contained in the Streets Sub-Index and are coded to the SLA(s) in which they lie.

The street named Split Street shown in the diagram, lies within both SLA 1 and SLA 2. It will have the relevant street number ranges recorded for each of the SLAs. Chapter 4 provides information on the Streets Sub-Index.

Image - The street named Split Street shown in the diagram, lies within both SLA 1 and SLA 2. It will have the relevant street number ranges recorded for each of the SLAs



CHAPTER 4 STREETS SUB-INDEX

The Streets Sub-Index contains records of street data for the split Localities listed in the Localities Index. This index enables specific Statistical Local Area (SLA) coding for split Localities where the street name and number are known.

STREETS SUB-INDEX FILE FORMAT

The standard Streets Sub-Index format is a comma delimited ASCII text file with fixed length fields and a record length of 102 characters.


FIELD NAME
START COLUMN
FIELD LENGTH
TYPE

Locality Name
1
40
alpha
S/T Code
42
1
numeric
SLA Code
44
4
numeric
Street Name
49
30
alpha
Street Type
80
9
alpha
Street Direction
90
1
alpha
Street Number Low
92
4
alphanumeric
Street Number High
97
4
alphanumeric
Odds/Evens/All flag
102
1
alpha

* Fields are separated by a comma.

Example:

Locality Name
S/T
SLA
Street
Type
Dir
Number
Range

ACACIA RIDGE
,3
,1001
,KILKENNY
,ST
,
,0001
,9999
,A
ACACIA RIDGE
,3
,1001
,KIRKLEY
,ST
,
,0001
,9999
,A
ACACIA RIDGE
,3
,1001
,LANCASHIRE
,ST
,
,0001
,9999
,A
ACACIA RIDGE
,3
,1001
,LANDSEER
,ST
,
,0002
,9998
,E
ACACIA RIDGE
,3
,1552
,LANDSEER
,ST
,
,0001
,9999
,O
ACACIA RIDGE
,3
,1001
,LARBERT
,ST
,
,0001
,9999
,A
ACACIA RIDGE
,3
,1001
,LAVERY
,ST
,
,0001
,9999
,A
ACACIA RIDGE
,3
,1615
,LEAROYD
,ST
,
,0136
,9998
,E
ACACIA RIDGE
,3
,1012
,LEAROYD
,ST
,
,0002
,0134
,E
ACACIA RIDGE
,3
,1001
,LEAROYD
,ST
,
,0001
,9999
,O



FIELD NAMES AND DEFINITIONS

The following field names and definitions relate to the Streets Sub-Index.

The Streets Sub-Index is subject to rules governing data representation and these are explained in Appendix 1.

Locality Name
Locality Name is a key field which links the split Localities on the Localities Index to their appropriate street data on the Streets Sub-Index.

Link to Localities Index
The Streets Sub-Index contains the names of all split Localities together with their street data. Each street is recorded with the State/Territory (S/T) code and four digit SLA code to which it belongs. These codes in the street data reflect the S/T code and the last four digits of one of the Australian Standard Geographical Classification (ASGC) code fields for the relevant Locality in the Localities Index. For example:

From the Localities Index, Blessington is a split Locality.


Locality Name
PI
PC1
PC2
S/T
Major SLA
2nd SLA (etc)
Major SLA Name

BLESSINGTON
,
,7212
,
,6
,15104013
,15104612
,LAUNCESTON (C) -PT C


From the Streets Sub-Index the split Locality, Blessington, has street data listed.


Locality Name
S/T
SLA
Street
Type
Dir
Number
Range

BLESSINGTON
,6
,4612
,ENGLISH TOWN
,RD
,
,0001
,9999
,A
BLESSINGTON
,6
,4612
,FISHERS TIER
,RD
,
,0001
,9999
,A
BLESSINGTON
,6
,4013
,FOLEYS
,RD
,
,0001
,9999
,A
BLESSINGTON
,6
,4612
,HAYES
,RD
,
,0001
,9999
,A
BLESSINGTON
,6
,4612
,OBRIENS
,RD
,
,0001
,9999
,A



S/T Code
The S/T code indicates the State or Territory in which the Locality and a street or part of a street exists. The definition of S/T is described in chapter 2.

SLA Code
The SLA code indicates the SLA in which the street or street segment exists. In the Streets Sub-Index only the S/T and SLA components of the ASGC code are held as this is sufficient to uniquely identify the appropriate SLA.

Street Name
This field contains the names of streets, roads, avenues, etc. found within the Locality. Significant residential buildings and properties have been included for some split Localities if considered appropriate.

Street Type
This field describes the Street Type that is linked to the Street Name field. Common street types have been abbreviated while lesser used ones are fully described. A full listing of the Street Types used in the NLI is detailed in Appendix 2. Where an abbreviation has been adopted for NLI purposes the full title is shown in brackets.

Street Direction
This field shows the geographic descriptor where it is part of the street name e.g. SMITH STREET NORTH will be represented as SMITH, ST, N.

The street directions used are:

(blank) = default
N
= North
S
= South
E
= East
W
= West

This field also shows a Multiple Occurrence flag where a street name occurs more than once in a split Locality and the streets lie in different SLAs. It flags each record of the street name.

M = Multiple Occurrence

Street Number Range
Where a street is wholly contained within an SLA the street number range is 0001-9999.

Where a street lies across an SLA boundary, a number range is displayed for the segments contained within each SLA. The number range indicates the lowest and highest numbers (inclusive) along the street for which each SLA code is valid.

Where a street crosses SLA boundaries and the street number range is unknown or, in the case of many rural roads, does not exist or cannot be determined from current sources, then the value of 0000-0000 is given for the street number range.

Odds/Evens/All Flag
This field flags whether all or specifically odd or even street numbers are included in the street’s number range for the SLA code.

O = odd numbers only
E = even numbers only
A = all numbers

Examples
Where a street is entirely within an SLA, the street number range is represented 0001-9999 A.

Where the odd side of a street is wholly within an SLA, the street number range is represented 0001-9999 O.

Where the even side of a street is wholly within an SLA, the street number range is represented 0002-9998 E.

Where the number range on the odd side of the street within an SLA is unknown, ambiguous, or does not exist, the street number range is represented as 0000-0000 O.

Where the number range on the even side of the street within an SLA is unknown, ambiguous, or does not exist, the street number range is represented 0000-0000 E.

Where the number range on both the odd and even sides of the street within an SLA is unknown, ambiguous, or does not exist, the street number range is represented 0000-0000 A.