“shaping australia” the development of a new statistical geography standard (the asgs)
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“Shaping Australia”
The Development of a New Statistical Geography Standard (the ASGS)
Alister NairnDirector, Geography
alister.nairn@abs.gov.auPh: 02 6252 7759
Overview• Who cares? Media / political / user
interest in geographic classifications• Conceptual reasons for change.• Overview of the new standard and
differences with ASGC.
Who Cares?
Political and User Interest
Conceptual Reasons for Change?
1. Functional geography rather than administratively based
2. More stable units over time3. Units size optimised for output4. Higher spatial resolution - MBs5. Better support for “Non ABS geographies”
Functional area - Cooma
The ASGC structure - Unstable
Australia
StatisticalDivision
StatisticalRegion
StatisticalSubdivisions
StatisticalDistricts
MajorStatisticalRegion
StatisticalRegionSector
StateTerritory
Remoteness
CensusCollection Districts
Sectionof
State
UrbanCenter/Locality
LocalGovernment
Areas
StatisticalLocal Areas
LGAs – Unstable over Time
State Councils1910
Councils1991
Councils2007
Councils2010
NSW 324 176 152 152
VIC 206 210 79 79
QLD 164 134 157 74
SA 175 122 68 70
WA 147 138 142 139*
TAS 51 46 29 29
NT n/a n/a 64 16
Historical change in local governments across Australia
Units optimised for release and analysis of statistics
How do we determine the optimal size for statistical areas?
– What data is being released?– Confidentiality issues– Accuracy issues (surveys – modelled data)
•Difficulty when the classification had to fit into widely different sized LGAs
Higher spatial resolutionGeographic
Units
ASGC (2006) ASGS(Approximations)
Mesh Blocks n/a 347,627
CD vs SA1 38,704 54,805
SLA vs SA2 1,426 2,214
Better Support for other Non-ABS Geographies
Overview of ASGSStructure
SA1• Built up from whole Mesh Blocks• Smallest Census output unit• More homogeneous in character, but replaces CD
CD SA1
Number: 38,704 54,805
Average Size: 500 people 400 people
SA2
SLA SA2
Number: 1,426 2,214
Average Size: 15,000 people 10,000 people
Range: 0-150,000 people 0-25,000 people
• Based on functional areas and suburbs• Intercensal output unit• Replaces SLA as sub-LGA geography
Sydney SLAs
Sydney SA2s
Other geographic levels• SA3s
– medium sized regions– Ranging from 30,000 – 130,000
• SA4s– Used as Labour Force Regions– Ranging from 100,000 to 500,000
• Greater Capital City Statistical Areas– Defined using whole SA4s– Similar to Capital City SDs– Designed to provide consistent boundaries– Incorporating any likely growth over the next 20 years
SA3 and SA4
Perth Greater Capital City vs Capital City SD
Adelaide Greater Capital City vs Capital City SD
Brisbane Greater Capital City vs Capital City SD
Melbourne Greater Capital City vs Capital City SD
Availability of Statistics
Population Statistics Available
SA4 > 100,000 Labour force
Aggregations of other stats
SA3 20,000 – 130,000 Aggregations of data at SA2 and below (small regions)
SA2 3,000 – 25,000 Census, ERP, health, building approvals, tourism, Ag. Census
SA1 – (Census Output Unit)
Approx 400 Census data, SEIFA
MB 0 and about 70 Population, Dwelling counts
Availability of statistics for different levels of geographyPopulation Statistics
Available
Capital City / rest of state > Hundreds of thousands
Household survey data
CPI
Significant urban areas > 10,000 ERP
Census
UCL / section of state Localities 200 - 999
Urban Centres > 1000
Census
Remoteness Census
Health (AIHW)
Conclusions• ASGS is here!• Published in Volumes
– Main Structure MBs Dec 2010– Non ABS Structures & Indigenous July 2011– UCL and SUAs October 2012– Remoteness Late 2012
• Annual update of correspondences to non- ABS structures
• Effective from July 2011• Last ASGC is July 2012.• Implementation plans by SMAs being developed.
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