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1996 CENSUS OF POPULATION AND HOUSING
OFF-SHORE, SHIPPING AND MIGRATORY COLLECTION DISTRICTS
Off-shore, shipping and migratory CDs are not spatial units in the usual sense as they have no defined boundaries. They are designed to facilitate the recording of people on Census night who are not in dwellings, but are in the following:
On oil rigs, drilling platforms and other off-shore structures. For the 1996 Census, Australian residents temporarily in Antarctica are included in a special type of off-shore CD, called the Antarctica CD.
On board vessels in and between Australian ports.
In transit on board long distance trains, buses and aircraft.
Dwellings in these CDs are classified into types: "Migratory dwellings" and "Off-Shore dwellings". Dwellings in Shipping CDs appear as Off-Shore Dwellings. Dwellings in the Antarctica CD are included in the off-shore, shipping and migratory CD of Antarctica.
Off-shore, shipping and migratory CDs are defined for all of the States of Australia. They are not defined for the Australian Capital Territory and the Other Territories.
Off-shore, Shipping and Migratory CDs also form their own spatial units for each level of the Australian Geographical Classification (ASGC). Postal Areas (POA) and Electoral Divisions (SED and CED) also have their own spatial units for Off-Shore, Shipping and Migratory CDs. For more information please refer to the following publications "Statistical Geography: Volume 1 Australian Standard Geographical Classification (ASGC)" catalogue number 1216.0 and "Statistical Geography: Volume 2 Census Geographic Areas, Australia" catalogue number 2905.0.
Off-shore CDs, Shipping CDs and Migratory CDs will be represented in digital CD boundary files as black stars (see Water CDs for graphic representation). For all higher level boundaries that include Off-shore, Shipping and Migratory CDs in CDAT96 the stars will be the same colour as the relevant boundary.
List of 1996 Migratory, Off-Shore and Shipping CDs
POINT COLLECTION DISTRICTS
Point CDs are special purpose CDs used in the Census where a specific community has a central location but where some or all of the members of that community may or may not be fixed to that location on Census night or any other night. These special purpose CDs are created so that special enumeration procedures can be applied to the particular circumstances. They include:
Point CDs are represented in the CD maps and in the digital boundary files as circular boundaries. They are approximately positioned close to the central location. They are assigned a small arbitrary area of 0.008 Sq Kms. The area assigned to the CDs does not reflect the area covered by the people enumerated in the CD and therefore the CDs are not representative of the population when used in choropleth (thematic or shaded) mapping. Similarly the area assigned to these CDs is not appropriate for population density analysis. Information on the area covered by the populations in these CDs would be very difficult to collect.
Point CDs can sometimes be the only CD in other higher level areas, for example a Point CD boundary might also be a POA boundary. Geographic classifications effected include Urban Centre/Localities (UCLs), Postal Areas (POAs), Indigenous Areas (IAREs) and Indigenous Locations (ILOCs). The statements made in the paragraph above also relate to boundaries in these classifications which are point CDs. They are easily identifiable by their area (0.008 Sq Kms).
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