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More information on Spatial Data Infrastructure (SDI)
Censuses:
- 2006 (Spatial Data Infrastructure)
- 2001 (National Geographic Base)
Remarks:
The data are maintained and stored in the Lambert conformal conic projection based on the North American Datum of 1983 (NAD83). Links to other data holdings, such as the address register and postal code files, are incorporated into the database.
Given the enhancements to the Spatial Data Infrastructure (SDI), primarily through the integration of improved road network data from the National Geographic Database (NGD), geography products for the 2006 Census allow users to geographically reference census data more accurately when compared to the 2001 Census products (e.g., cartographic boundary files, digital boundary files, reference maps, road network files).
Product files from the SDI are available in the Geography Division's data warehouse (GeoDepot).
Refer to the related definitions of block-face; cartographic boundary files (CBFs); coordinate system; datum; digital boundary files (DBFs); dissemination block (DB); geocoding; map projection; National Geographic Database (NGD); reference map; representative point and road network files (RNFs), and to related reference guides.
Changes prior to the current census:
For 2001, the internal database was called the National Geographic Base (NGB). As well, the NGB was divided into National Topographic Data Base (NTDB) map tiles.
