Download - ASGS Roadshow Presentation
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Implementing the
Australian Statistical
Geography Standard
(ASGS)
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This presentation
• Overview of ASGS
• ASGS Implementation
• Issues
• Strategies
• The ASGS into the future
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ASGC Australia
Statistical
Division
Statistical
Region
Statistical
Subdivisions
Statistical
Districts
Major
Statistical
Region
Statistical
Region
Sector
State
Territory
Remoteness
Census
Collection
Districts
Section
of
State
Urban
Center/
Locality
Statistical
Local Areas
Local Gov.
Areas
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Why change?
• Unstable
• Inconsistent units
• Often not meaningful
• Administrative rather than functional
• Not optimised for data output
• Need to incorporate Mesh Blocks
• Not a complete framework
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Why change now?
• Technological and data
developments
• Wide adoption of GIS
• G-NAF
• Address coding
• Imagery availability
• Mesh Blocks
• Census year
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ASGS
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What does the ASGS bring?
• Stability over time
• No change to ABS structures between
Censuses (5-yearly)
• Areas designed for minimum change at
all levels
• Reflects real settlement patterns and
relationships
• Optimised at all levels for data release
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Mesh Blocks
• Smallest region defined
• 347,627 MBs
• Building block
• Reflect land use
• If populated: generally 30 – 60
dwellings
• Limited data availability
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Mesh Blocks: Palmerston
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SA1s
• Census output
• 54,805 SA1s
• Average population 400
• Optimal range 200 - 800
• Similar characteristics
• Internally connected
• Reflect wherever possible localities
and suburbs
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SA1s: Monash
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SA1s: Emerald
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SA2s
• Optimised for demographic data
(ERP)
• Non-Census data available
• 2,214 SA2s
• Functional area in regional Aust.
• Based on gazetted suburb/locality
• Average population 10,000
• Optimal range 3,000 - 25,000
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SA2s: Perth
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SA2s: Traralgon Area
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SA3s
• Mid-level geography
• Reflect “local regionality”
• 351 SA3s
• Optimal pop range 30,000 –
130,000
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SA4s
• Optimised for Labour Force data
• Other Survey data, 106 SA4s
• Optimal Range 100,000 – 500,000
• Minimise relative standard errors
• Designed to reflect labour markets
• Local labour catchments in large cities
• Regional labour markets outside
• Based on Journey to Work analysis
• Major city influence removed from
regional data
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SA4s and SA3s: Melbourne
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SA4s and SA3s: NSW
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ASGS – other areas
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GCCSAs
• Built from whole SA4s
• Define socio-economic extent of
cities (JTW analysis)
• Includes regional commuter zone
• Allows comparison with Survey
data (also SA4-based)
• More current reflection of Capital
Cities than Capital City SDs
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GCCSA: Greater Melbourne
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Greater Melbourne: Changes
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SD to GCCSA scale of population change
Capital City Population
increase
2001 (pers)
Population
increase
2010 (pers)
Population
increase
2010 (%)
Sydney 80 80 0.0
Melbourne 50,300 60,700 1.4
Brisbane 51,200 65,300 3.2
Adelaide 46,800 58,200 4.8
Perth 59,100 85,100 5.0
Hobart 1,000 1,100 0.5
Darwin 0 0 -
Canberra 380 350 0.1
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Indigenous Structure
• Integral part of ASGS
• Significant design factor at SA1
level
• Better represents discrete
Indigenous communities (SA1s)
• Addresses some previous issues
• Defines communities of 90+
• Reflect collector workloads
• Published September 2011
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Oak Valley, SA - 2006
??
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Oak Valley, SA – 2011 34kms south . . . .
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Urban Centres and Localities
• SOS and UC/L combined
• New coding structure
• Conceptually similar to the past
• Based on whole SA1s
• Will result in some change
• More UCL’s identified in design
process
• Rules applied more rigorously
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Remoteness
• Conceptually the same
• Based on SA1s
• Some change expected
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Remoteness Areas: Sources of change
• Real change
• changes in urban centres and
localities
• improvements in road network
• Methodological change
• move to SA1s
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ASGS
Implementation
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Issues
• What data will be available?
• When?
• What geographies?
• How will time series be managed
for ABS data
• Legacy Systems
• Legislation
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Strategies
• ABS is finalising comprehensive
implementation plan
• SMAs responsible for advising
clients of changes
• ABS will publish a summary
document
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Time series strategies
• Data release on parallel
geographies (SLA and SA2 for
2011)
• Continued release of data at LGA
level
• Re-casting data
• Re-coding preferable to using
correspondences if addresses known
• Correspondences
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Some key collections
Note: Publication release dates in brackets
Collection First ASGS data Last ASGC data
Building Approvals July 2011
(August 2011)
June 2012
(July 2012)
Business Counts 2007-2011
(December 2011)
2007-2009
(October 2010)
Census 2011
(June 2012)
2011
(June 2012)
Tourist
Accommodation
Mar Qtr 2012
(June 2012)
Dec Qtr 2011
(March 2011)
Demography –
Regional Pop Growth
2010-11
(July 2012)
2010-11
(July 2012)
Births and Deaths 2011
(Nov 2012)
2011
(Nov 2012)
Labour Force July 2013
(Aug 2013)
Jun 2013
(July 2013)
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Correspondences
• New method for building correspondences based on Mesh Blocks
• More accurate method that better identifies where the population is
• ABS will provide to support ASGS implementation
• Publish information paper late this year
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Some correspondences - Census
• SA1 and SA2 to all ASGS-
supported geographies
• SLA to ASGS 2011
• POA (&or postcode?) to ASGS:
• Suburb and Locality to:
• SA2, SLA
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Census
• SLA and ASGS for 2011
• Time Series on SLA and SA2 for
2001-2006-2011.
• Comparability tables for CD to SA1
• Census Information Paper • Census of Population and Housing:
Outcomes from the 2011 Census Output
Geography Discussion Paper
(2911.0.55.003)
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Demography Regional Population Growth (3218.0)
• 2010/11 data on SLA/LGA/SA2 –
SA2 and LGA thereafter
• Recast SA2/LGA ERP to 2001
• Recast GCCSA ERP to 1981
• Additional data at SA1 level by
request
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Legacy systems
• ASGS main structure hierarchy
same as ASGC • incl 9 and 5 digit SA2 codes
• incl fully hierarchical and 7 digit SA1 codes
S/T SA4 SA3 SA2 SA1 (1 dig) (2 dig) (2 dig) (4 dig) (2 dig)
2
212
21205
212051323
21323
21205132330
2132330
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Legislation
• ASGC referenced in legislation and
regulation
• Letters sent to Attorneys General in
each State
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Future of the ASGS
• Reviewed every 5 years
• Monitoring changes in settlement
patterns
• Designed for minimum change:
• allowance for growth
• splits
• amalgamations
• New Non-ABS structures on a case
by case basis
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Resources
• www.abs.gov.au/geography
• Publication
– Manual
– Boundaries (GIS and PDF)
• Correspondences (in progress)
• Fact Sheets (in progress)
• SMA Information papers
– Census (2911.0.55.003)
– Demography (in progress – Aug 2011)
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Questions?