Table B.4
Sources and methods
| Data reference year | ||||
|---|---|---|---|---|
| Data or area | 1971 | 1991 | 2001 | 2011 |
| Census metropolitan areas (CMA) | 2011 CMA boundaries were used for all years. Total area excludes water. | |||
| Census metropolitan area-ecosystems (CMA-E) | Included all Soil Landscapes of Canada (SLC) polygons (version 3.2) that were contained within or that intersected the CMA boundary, as well as SLC polygons that are fully contained within this newly formed boundary of the CMA-E. Total area includes water. | |||
| Built-up, settled and road areas | Used Canada Land Inventory: Land Use (CLI: LU), circa 1966 and Canada Land Use Monitoring Program (CLUMP), 1971 land use code B – Urban built-up area with adjustments to subtract roads from the core built-up area to produce the settled area. CLUMP coverage excludes the CMAs of Moncton, Trois-Rivières, Sherbrooke, Peterborough, Kingston, Barrie, Brantford, Kelowna and Abbotsford–Mission. Land areas that were not built-up in Agriculture and Agri-Food Canada's (AAFC) Land Use, 1990 were removed and reclassified based on the 1990 data. The sources for 1971 do not contain the same level of road detail. To address this, roads were modeled by multiplying settled area by the ratio of roads to settled area from Land Use, 1990. | Used the AAFC 30 m Land Use, 1990 codes 21 (Settlement—Built-up and urban) and 25 (Roads—primary, secondary and tertiary). | Used the AAFC 30 m Land Use, 2000 codes 21 (Settlement—Built-up and urban) and 25 (Roads—primary, secondary and tertiary). | Used the AAFC 30 m Land Use, 2010 codes 21 (Settlement—Built-up and urban) and 25 (Roads—primary, secondary and tertiary). |
| Arable land | Composed of the variables cropland, summerfallow and tame or seeded pasture from the Interpolated Census of Agriculture. Data suppressed to meet the confidentiality requirements of the Statistics Act were converted to values of zero. This suppression had little effect on the estimates in most CMA-Es—see Table B.3. This data is available only for CMA-Es. | |||
| Natural and semi-natural land | Calculated as a residual, i.e., the area left over once the built-up and arable areas were subtracted from the total CMA-E area. Because it was calculated residually, it includes some homes and other buildings, particularly those located on large lots and in rural areas. | |||
| Water | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Derived from Natural Resource Canada’s CanVec+ geospatial dataset. |
| Forest | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Areas that are not built-up, arable or water, but that are classed as 210– Coniferous, 220–Deciduous and 230–Mixedwood in AAFC Crop Inventory, 2011. |
| Other natural and semi-natural land | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Note ..: not available for a specific reference period | Calculated as a residual, once the built-up, arable, forest and water areas were subtracted from the total CMA-E area. |
| Arable land lost to settled area | Calculated by overlaying the growth in settled area between 1971 and 2011 on the CLI: LU base layer and, for areas where the 1971 settled area was trimmed, on the area reclassified using AAFC's Land Use, 1990. Included the following CLI classes: cropland, improved pasture and forage crops, orchards and vineyards and horticulture, as well as cropland from Land Use, 1990. Arable land lost to roads was not included. | |||
| Agricultural land lost to settled area, by soil capability | Calculated by overlaying the growth in settled area between 1971 and 2011 on the Canada Land Inventory: Soil Capability for Agriculture layer. Included Class 1 to 3 (dependable agricultural land) and Class 4 to 6 (land with important limitations for agriculture). Agricultural land lost to roads was not included. | |||
| Natural and semi-natural land lost to settled area | Calculated by overlaying the growth in settled area between 1971 and 2011 on the CLI: LU base layer and, for areas where the 1971 settled area was trimmed, on the area reclassified using AAFC's Land Use, 1990. Included the following CLI classes: woodlands, rough grazing and rangeland, outdoor recreation areas, rock and unvegetated surfaces, open wetland and unmapped areas. A small amount of land classed as mines, quarries sand and gravel pits was also included. For land reclassified from Land Use, 1990, the following classes were included: forest, forest wetland, grassland managed, grassland unmanaged, trees, treed wetland, wetland, wetland herb, wetland shrub, water, settlement, roads and other land. Natural and semi-natural land lost to roads was not included. | |||
| Population and dwelling | Used enumeration area points from the Census of Population. Total population and dwelling data were recompiled to meet the 2011 CMA boundaries. Settled area population and dwelling data take points located within 400 m of the 1971 settled area. | Used enumeration area points from the Census of Population. Total population and dwelling data were recompiled to meet the 2011 CMA boundaries. Settled area population and dwelling data take points located within 400 m of the 1991 settled area. | Used dissemination block points from the Census of Population. Total population and dwelling data were recompiled to meet the 2011 CMA boundaries. Settled area population and dwelling data take points located within 400 m of the 2001 settled area. | Used dissemination block points from the Census of Population. Settled area population and dwelling counts take points located within 400 m of the 2011 settled area. |
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.. not available for a specific reference period Source: Environment, Energy and Transportation Statistics Division, 2016. |
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