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2001 Census Miscellaneous Collection Districts
However, the above special purpose CDs are not always Point CDs.
Point CDs are represented on CD maps and in the digital boundary files as a star-shaped boundary (see below).
Point CDs are positioned approximately at the central location of the community. Apart from their distinctive shape, they can also be identified by their CD Type. The area assigned to each CD does not reflect the area occupied by the people enumerated in that CD and therefore point 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 actual area occupied by the populations in these CDs is not available due to either:
A single point CD may sometimes form a higher level area, for example, a Point CD boundary may also be a Postal Area (POA) boundary. Geographic classifications where this may occur include Urban Centre/Localities (UC/Ls), Postal Areas (POAs), Indigenous Areas (IAREs) and Indigenous Locations (ILOCs). Such boundaries are easily identified by their star shape. The same constraints that apply to the use of point CDs for thematic mapping and population density analysis apply also to these higher level areas.
Water Collection Districts
Water CDs cover bodies of water such as lakes and parts of rivers where people are likely to be counted on Census Night, for example, sections of Sydney Harbour where people are likely to be resident on vessels.
Water CDs have a default land-based CD to which they are linked. This CD is normally nominated because of a connection to the water CD, for example, it is the place where people are likely to come ashore. The census form for any person enumerated in a Water CD is transferred to the default land-based CD at the time that the census forms are processed. Water CDs therefore do not have any statistical data associated with them - they are nil CDs - and no digital boundaries have been made available for them.
Deliberate Nil Collection Districts
Deliberate Nil CDs are land based CDs that have been purposely designed to contain no dwellings or population. This could occur for example in industrial areas and national parks. The inclusion of these unpopulated areas into an adjoining urban area would distort the calculated population density. These CDs are still allocated to collectors who confirm their Nil CD status. The census form for any person enumerated in a Nil CD is transferred to the nominated alternative CD at the time that the census forms are processed. Deliberate Nil CDs can be identified by their CD Type.
Deliberate Nil CDs should not be confused with CDs where it was expected that people would be counted but for some reason none was present on Census Night.
In Western Australia there are 513 Deliberate Nil CDs. This number, much higher than for any other state or territory, results from the manner in which Indigenous outstation CDs were initially designed. Many of these CDs had a low population count and their counts have been transferred to their surrounding CD.
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.
Off-Shore, shipping and migratory CDs are defined for all of the States of Australia and the Northern Territory. They are not defined for the Australian Capital Territory and the Other Territories.
Off-Shore Collection Districts
An Off-Shore CD covers all structures (such as oil and gas drilling rigs) in Australian waters or those structures outside Australian waters for which immigration formalities are not required to be completed.
For the 2001 Census, each state and territory (with the exception of the ACT) has a single Off-Shore CD. Australian residents temporarily in Antarctica have been included in a second Off-Shore CD for Tasmania. Australian residents at Macquarie Island on Census Night are also counted in the second Off-Shore CD for Tasmania.
Off-Shore CDs will not be represented in 2001digital boundary files as they have no defined geographic location.
Shipping Collection Districts
A Shipping CD covers an area of water, normally a port which is controlled by a Port Authority. The types of vessels in a Shipping CD that need to be enumerated include cargo vessels (with Australian crews or crew members), passenger liners, fishing vessels, dredges, pleasure craft, and yachts.
People enumerated on board vessels between Australian ports are also attributed to Shipping CDs.
In general, people on board vessels departing for an overseas port are considered out of scope for the Census as they have departed from the country.
Shipping CDs will be represented in digital CD boundary files for CDATA 2001 as boundaries in the shape of a boat (see below). Polygons have been used instead of point symbols because in MapInfo, point symbols stay at a constant display size irrespective of map scale. Symbols would therefore dominate maps of larger areas.
Migratory Collection Districts
Migratory CDs will not be represented in 2001 digital boundary files as they have no defined geographic location.
Dwellings in Off-Shore Shipping and Migratory Collection Districts
Ships and other commercial transport can include dwellings. These dwellings are classified into two types: "Migratory dwellings" and "Off-Shore dwellings". Dwellings in ships either in port or between Australian ports are counted in the Off-Shore CD for the respective state or territory. Dwellings in the Antarctica and Macquarie Island are counted in the second Off-Shore CD for Tasmania.
Off-Shore, Shipping and Migratory is a separate class in each level of the Australian Standard Geographical Classification (ASGC) for those structures which cover all of Geographical Australia. POAs and Electoral Divisions (SED and CED) also have a separate class for Off-Shore, Shipping and Migratory. For more information please refer to the publications: Statistical Geography: Volume 1 Australian Standard Geographical Classification (ASGC) 2001 (Cat. no. 1216.0) and Statistical Geography: Volume 2 Census Geographic Areas, Australia 2001 (Cat. no. 2905.0).
List of 2001 Census Off-Shore, Shipping and Migratory Collection Districts:
New South Wales
Australian Capital Territory
No Migratory, Off-Shore or Shipping
No Migratory, Off-Shore or Shipping
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