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More information on Map projection
Censuses:
- 2006, 2001, 1996, 1991, 1986, 1981, 1976 (Lambert conformal conic)
- 1996, 1991, 1986, 1981, 1976, 1971 (Transverse Mercator)
Remarks:
The earth's surface cannot be flattened without distorting geometrical properties, such as area, shape, distance and direction. These spatial properties can be preserved individually (at least locally) and in certain combinations on map projections. However, the four basic properties of area, shape, distance and direction cannot all be held true simultaneously. Therefore, it is important to select a projection having the properties that are suited to the mapping situation. For example, a projection that accurately represents the shapes of the continents will distort their relative sizes.
The Lambert conformal conic projection (Figure 33) provides good directional and shape relationships for mid-latitude regions having a mainly east-to-west extent. Standard parallels at 49oN and 77oN are most commonly used. The scale is correct along the standard parallels only; areal deformation decreases between and increases away from the standard parallels. The central meridian, normally at 91o52'W, is a straight line about which the projection is symmetrical. False eastings and northings are given to ensure positive coordinate values.
Figure 33 Example of a map projection and unprojected coordinates
Latitude and longitude is not a map projection, as the coordinates are unprojected. It is recommended that maps not be generated using these spherical coordinates because they result in maps that are distorted (Figure 33).
The Lambert conformal conic map projection is the working projection for cartographic boundary files, digital boundary files, road network files and the Spatial Data Infrastructure, and for generating representative points.
Refer to related definitions of cartographic boundary files (CBFs); coordinate system; datum; digital boundary files (DBFs); representative point; road network files (RNFs) and Spatial Data Infrastructure (SDI).
Changes prior to the current census:
Prior to 2001, street network files were based on the Transverse Mercator map projection/Universal Transverse Mercator (UTM) coordinate system.
