CMA and CA tutorial, part 3
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Core rule
Once a population centre attains a total population of 10,000 people, it is eligible to become the core of a census agglomeration (CA). Once a population centre attains a total population of 50,000 people and it is already the core of a CA, then it is eligible to become the core of a census metropolitan area (CMA).
All census subdivisions (CSDs) that fall completely or partly inside the core are included in the CMA or CA. If a smaller CSD exists within one of the CSDs that are already included in the core, creating a 'core hole,' then that CSD is also included in the CMA or CA.
Since CMAs and CAs are based on CSDs, a 'delineation core' is created from those CSDs that came into the CMA or CA under the core rule and have at least 75% of its population living in the core. These CSDs are used for determining whether other CSDs will be included in the CMA or CA according to the next three rules.
Example of census subdivisions added to a census metropolitan area and census agglomeration due to the core rule
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