Concept: Intra-Urban Areas
Last Updated: 2008-05-26
Burgess concentric zone model
Chicago Schizophrenia Rates
Defining Intra-Urban Areas
Three intra-urban areas were chosen, based on urban theory and two previous Canadian studies (see McLemore, Aass, and Keilhofer, 1975 ; Ram, Norris, and Skof, 1989 ) that took the "inner city" (but not any other areas) as those neighborhoods in proximity to the CBD with substantial pre-1946 housing stock.
With this background in mind, we conceptualized the inner core to correspond to the disadvantaged, heterogeneous "zone of transition" in the Chicago model: the oldest, densest and poorest areas of Winnipeg.
We conceptualized the outer core to correspond to the oldest and densest areas of the city, but not the poorest. These neighborhoods tend to be elite areas that have maintained their social and physical integrity (see Ley, 2001 ).
Finally, the suburb is basically the remaining areas of the city - by default, the newest, least dense areas.
Data for the intra-urban analysis was based on 2001 Canadian Census Data at the dissemination area and Community Centre Area for the WRHA. Data was extracted from 2001 census on housing age (total number of occupied private dwellings, construction pre-1946), density (population, CCA area in hectares), and income (median 2000 household income; incidence of low income among economic families).
Below are the specific steps to designate the inner core, outer core and suburbs.
- Assign the Census 2001 dissemination areas to the 75 community centre areas, using a conversion table provided by the MCHP, in order to aggregate dissemination area data from the 2001 Census to the appropriate CCA.
- Once the population-weighted dissemination data have been aggregated by CCA, it was possible to calculate for each CCA its density (population divided by hectare), the proportion of housing stock built before 1946 (pre-1946 stock divided by entire occupied housing stock), and the median household income. Using population-weighted CCA values, it was then possible to calculate median values for the entire WRHA for density (23.36 persons per hectare), the proportion of housing stock for each CCA built before 1946 (19.75%), and household income ($46,425).
- Using the query builder in ArcView, find all CCAs that had above median density and median pre-1946 construction - this represents the core area (both inner and outer).
- Include contiguous CCAs to the inner core (i.e. downtown, etc.). Note that the following rules are sequential.
- RULE 1: The Ram, Norris and Skof (1989) study on the Canadian inner-city identified two more CCAs - 73 (Downtown) and 8 (Central)- that belong in the inner core. The study determined inner-city boundaries by "land use and age of development criteria, selected in consultation with the Planning Departments of respective cities. Thus, the inner city refers to the core of the metropolitan area, which includes the site of the earliest development of the city, the Central Business District (CBD) , and the surrounding areas of mixed land uses, with high density residential development". 29 CCAs were assigned to the inner core by this rule.
- RULE 2: Contiguity rule was applied to remaining CCAs with either above average density and above median pre-1946 housing stock, and that the remaining CCAs had to have at least half their borders with core CCAs (n=4). This rule was applied only once, and did not consider areas that were contiguous after the subsequent CCAs were chosen.
There is now a total of 33 CCAs.
- RULE 3: Of the core CCAs with less than the median of the median household incomes ($46,425) for all the CCAs, 27 CCAs were considered "inner core areas"; those above the median were considered "outer core areas" (see map ).
All the remaining CCAs were considered suburban.
- As the results below demonstrate, the outer core areas are older and denser than the Winnipeg city median; the inner core areas are older, denser and poorer than the Winnipeg city median; and all other CCAs are by default suburban.
Intra-urban area Population Median % pre-1946 (sd) Median household income (sd) Median pop density (sd)
Inner core 189,090 44.8% (15.1) $33,579 (7395) 31.03 (17.01)
Outer core 44,393 40.8% (9.9) $49,152 (12490) 26.95 (7.83)
Suburb 408,107 4.6% (1.2) $59,557 (15937) 18.87 (4.92)
How the three areas are related to mental health services is described below:
Intra-urban area Average Gross Rent in $Cdn Psychiatric beds per 1,000 population a Licensed mental health care facility beds per 1,000 population b Rooming home units per 1,000 population c
Inner Core $ 518.51 0.61 1.39 3.92
Outer Core $ 882.50 0
Suburb $ 603.00 0.19 0.24 0.06Note:
a - Data for psychiatric beds were obtained from the Winnipeg Regional Health Authority (WRHA), December 2000; population data are from the 2001 census.
b - Data for licensed mental health care facilities (which provide space for 4-6 residents) was provided directly by the WRHA, December 2001; population data are from the 2001 census.
c - Rooming home data were obtained from a 1999 City of Winnipeg survey; population data are from the 2001 census.