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Geo-referenced data and DLI aggregate data sources

Geo-referenced data and DLI aggregate data sources. Chuck Humphrey. University of Alberta ACCOLEDS 2007. Geo-referenced data.

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Geo-referenced data and DLI aggregate data sources

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  1. Geo-referenced data and DLI aggregate data sources Chuck Humphrey University of Alberta ACCOLEDS 2007

  2. Geo-referenced data • This presentation provides an introduction to aggregate data sources, primarily from Statistics Canada, that may be of value to those using GIS to explore the spatial distribution of Canadian socio-economic characteristics. • To be of use to GIS researchers, these aggregate products must contain geo-referenced data.

  3. Geo-referenced data • What are geo-referenced data? • Aggregate data, which are often organized in multi-way tables, containing at least one variable representing a specific spatial unit in which the geo-codes are based on a standard geographic classification and/or have corresponding boundary files using the same geo-coding system. • A spatial unit is the geographic area used as the unit of analysis to structure the data.

  4. The geography perspective Geographic areas will define the spatial units and the geo-codes assigned to these spatial units are necessary to match geo-referenced data.

  5. Spatial Unit Geo-codes

  6. The geo-referenced data perspective The unit of analysis, which defines the structure of a data file, is in this case a spatial unit. The Unit analysis makes up the rows in the data file and is the object being described by the other variables the file.

  7. Geo-referenced data strategies • For a GIS user, we want aggregate data files where the variables summarize social and economic characteristics over spatial areas and the data file is structured with the spatial unit as the unit of analysis. • We want the spatial unit in the data file to correspond with our GIS user’s boundary file. • We want the variable representing the spatial unit to use the same geo-codes that match our GIS user’s boundary file.

  8. The Census • The Census is one of the most important sources of geo-referenced data. It is the largest survey conducted in Canada and, consequently, is the primary source of statistics for small areas. • To use geo-referenced data from the Census, you must know: • The variety of spatial units used to disseminate Census results; • The codes used to represent the various Census spatial units; and • The aggregate characteristics from the Census available for the various spatial units.

  9. 1: The variety of spatial units • Statistics Canada groups the variety of spatial units associated with the Census into two groups: Source for the graphics: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  10. Administrative areas Source: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  11. Statistical areas Source: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  12. 2: Census geo-codes • Statistics Canada has two categories of geo-code systems: • Standard Geographic Classification (SGC) • Other geographic entities Source for the graphic: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  13. Standard geographic classification Source: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  14. Standard geographic classification, 2006 The link to Definitions, data sources and methodson the main page of the Statistics Canada website provides a link to Standard Classifications, which includes Geography.

  15. Standard geographic classification, 2006 From the link for the province codes, census divisions can be identified. For example, click on 59 for BC and the list of census divisions is presented.

  16. Standard geographic classification, 2006 Click on the link for the census division for Nanaimo (5921) and the list of census subdivisions within this CD is provided.

  17. Standard geographic classification, 2006 Click on the link for the census subdivision for the city of Nanaimo and the breakdown of the SGC is provided along with other geographic codes.

  18. Other geographic codes • Under the information provided for the Standard Geographic Classification, coding systems for four additional spatial units are listed : • Census metropolitan areas and census agglomerations; • Economic regions; • Health regions; and • Countries.

  19. Dissemination areas Source: Illustrated Glossary, 2006 Census Geography, Statistics Canada

  20. Dissemination areas Let’s add a DA-level to the SGC! The geo-code for DA’s uses the Standard Geographic Classification and an added, unique four digit numeric code. For Nanaimo, the CSD code is: 59 BC 21 Nanaimo RD 007 Nanaimo City 5921007 Dissemination areas

  21. Dissemination areas • The Census aggregate data at the DA level are available using two different geo-codes schemes (shown on the next slide). • For GIS users working with the spatial data files from the 2001 Census, caution them about these two different geo-coding schemes at the DA level. They will want to use the eight-digit code to be able to work directly with the spatial data files provided by Statistics Canada.

  22. 8-digit DA-level code PR(2)-CD(2)-DA(4) 11-digit DA-level code PR(2)-CD(2)-CSD(3)-DA(4)

  23. Dissemination areas 11-digit DA 8-digit DA

  24. 3: Aggregate characteristics • Profile series and basic tabulations • Aggregate Census results are disseminated in two primary products: profile series and basic tabulations. • The Profile series is available at all levels of geography disseminated by Statistics Canada and consists primarily of counts for all the response categories to questions in the 2B form. In 2006, the 2B form consisted of the eight questions asked on the 2A form plus an additional 53 questions. This series is the most frequently used by GIS researchers on our campus.

  25. Profile series breakdown

  26. Basic tabulations • Basic tabulations are n-way tables showing the results for combinations of Census questions. The more the variables included in the table, the higher the level of geography that is reported. Few of these tables are below the CSD, CMA/CT level, although always check. For example, in 2001 Religion (13) by Age (8) is available at the DA level.

  27. Aggregate Census data • Want data at the CT-level or higher? • E-STAT has these data in Beyond 20/20, DBF, CSV, Tab-delimited format. • Available in Beyond 20/20 format on the Statistics Canada website with level 2 access and from the DLI FTP site. • Want data at the DA-level? • Available through the DLI FTP site or local DLI member aggregate Census file servers.

  28. Other Geo-referenced data • Other important aggregate data sources from Statistics Canada include Health, Justice, Education, Business, Environment and some customized products. • Not all of these, however, have compatible spatial boundaries with the Census. • Some may make reference to metropolitan areas but not use the Census geo-codes for Census Metropolitan Areas.

  29. Health • Health Region is the administrative area in which health care is delivered in Canada. • As administrative areas, Health Regions are determined by the provinces. Statistics Canada creates a customized product from the Census aggregating results using Health Region boundaries. • Health Indicators and Community Profiles are the two key sources for Health Region aggregate data.

  30. Health • CIHI is responsible for disseminating statistics about the health care system at the Health Region level. The CIHI site provides maps without the data for a few indicators. The database, Regional Contextual Information for Health Regions with over 75,000 Population, appears to be the only data source on the CIHI site for Health Regions.

  31. Justice • The table may refer to jurisdiction instead of geography. • Justice tables • Table 253-0004 - Homicide survey, number and rates (per 100,000 population) of homicide victims, by census metropolitan area • Refer users to http://www.statcan.ca/english/sdds/3315.htm • Report homicides according to four population sizes: 500K +, 250-499K, 100-249K and < 100K • Group metropolitan areas under these categories

  32. Justice

  33. Justice

  34. Justice • Justice tables • Police Administration Survey - Municipal Police Force Administration Character, 1986 - 2006 • 866 municipal police force jurisdictions • The geo-code for municipalities consist of the standard geography classification for provinces (2-digit codes) followed by 3-digit codes that don’t correspond to Census geography but do correspond with the Uniform Crime Report police force codes

  35. Nanaimo59904 Justice

  36. Justice • Justice tables • Uniform Crime Survey – Crime Statistics, All Police Services, 1977 - 2003 • “There are approximately 1,200 separate police locations responding to the survey, comprising about 220 different police forces.” Canadian Crime Statistics, 85-205-XIE, p. 73. • This table contains 2,711 police detachments, some no longer operational. • The geo-code corresponds to the Police Administration Survey: 2-digit province code and 3-digit detachment code.

  37. Nanaimo59904 and 59905 Justice

  38. Education • The Education tables on the DLI FTP site provide provincial level summaries and for some post-secondary related tables, institution names are provided. No Census spatial units, other than province, are used among this tables. • The Statistics Canada website contains the Report of the Pan-Canadian Education Indicators Program. Includes the use of CMA and non-CMA reporting for some tables. Names and not geo-codes are used to identify CMA’s.

  39. Business • Canadian Business Patterns reports the number of establishments by industrial classification and size of workforce. These aggregate data are available for CD, CSD and CMA/CA levels of Census geography. • The data also provide a time series at these geographic levels since 1998 for both the NAICS and SIC industry classifications.

  40. CANSIM • CANSIM is primarily a time series database but every time series is placed in the context of some level of geography. One can search table titles for geography terms but cannot currently search just the geography field within each series.

  41. Odds and ends • Survey of Household Spending • Equipment (62F0041XDB): 17 metropolitan areas • Spending (62F0031XDB): 17 metropolitan area • Canada Revenue Agency • Provincial level statistics summaries from tax returns. • Environment Canada data sources use postal codes in some instances • Environment • Human Activity and the Environment: Annual Statistics Product (16-201-XWE) • Available in CANSIM series, too

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