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GIS-Based Census Mapping: Australia Experience

This presentation discusses how GIS technologies were used for CD design and map production for the 2006 census in Australia. It explores the use of GIS in CD alignment, design, and map production. The paper emphasizes the importance of reliable data sources and skilled technical staff for successful implementation.

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GIS-Based Census Mapping: Australia Experience

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  1. GIS BASED CENSUS MAPPING APPROACHES - AUSTRALIA EXPERIENCE Presentation to the UN Experts Group Meeting UNSD 29 May - 1 June 2007 Alister Nairn Director - Geography Section

  2. Introduction • Paper focuses on how GIS technologies have been utilized for CD design and map production for the 2006 census in Australia

  3. Census of Population and Housing • 5 yearly -2006 Census on 8 August 06 • Census based on delivery and collection of census forms - 8.5 million forms hand delivered • 38,704 CDs, 25,000+ field staff to collect, 800+ staff to process • First results published in June 2007 • Pressure to increase efficiencies • Mapping is an integral part of the collection methodology

  4. Collection Districts – Basis for Enumeration

  5. An Urban CD Map

  6. A Rural CD Map (section)

  7. The Collector Record Book

  8. Spatial Data Requirements – The Ideal • An accurate up to date digital map base showing correct level of detail. • Roads, water bodies and rivers, transport, parks • Administrative boundaries – suburbs, LGAs electoral divisions, state boundaries • Cadastral property boundaries • Location of residential dwellings (addresses) • Up to date large scale imagery ? ?

  9. Data Sources Without accurate digital base data GIS efficiencies are not possible – Sources: Federal and State mapping agencies Private sources ABS strategy was to get the mapping agencies to cooperate – A consortium of of Federal and State mapping agencies – PSMA Australia (Public Sector Mapping Agencies)

  10. Technology • GIS system for editing, analysis, mapping • Used MapInfo, MapBasic • Cartographic Enhancement • Maplex from ESRI • Database – storage, retrieval of information • Oracle • Conversion / QA software • SAFE FME

  11. Geography Section - Staffing • Provides a centralised centre of expertise for Geography within the ABS • 25 staff, most with a university degree and/or GIS experience • Maintain geographic classification • Provide GIS services to rest of the organisation (Census is the largest client) • Maintain spatial database, evaluate and implement new spatial technologies.

  12. Census Mapping Project – Process Design

  13. Phase 1 - CD Alignment • Red line is the old CD boundary – Black the new • GIS tools developed to speed up the editing process for multiple points – work not done by GIS experts • 10 staff person years of effort in this editing to bring 2001 CDs into alignment with 2006 base mapping.

  14. Phase 2 – CD Design • Reviewing the 2001 CDs and redesigning in areas of change (growth or decline in population) • Change estimated number of households by various means • Address points • Cadastral parcels • Information from local government • Eg GIS SQL query against cadastral parcels in 2001 versus 2006

  15. SQL query on Spatial Database

  16. Spatial Editing of CDs

  17. Updating CD Attributes

  18. Phase 3 – Map Production • A large logistical operation • High quality maps increase efficiency of the census collection phase • 69,548 A3 maps • 7,840 A2 maps • 5,818 inset maps • 6,678 Area Supervisor maps • 102 District Managers maps

  19. Conclusions • Development of GIS capabilities has contributed to more efficient Censuses by: • Use of GIS to assist in CD design • Produce excellent maps to aid the collection process • Producing quality statistical geography for analysis and dissemination

  20. Conclusions BUT • GIS will only save costs if there is a reliable source of suitable data and a core section of people with well developed technical skills. • These data resources can require some institutional development over an extended period.

  21. THANK YOU

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