Technical Description

Cadastre is created through processing cadastral data sourced from Australia’s States and Territories. Source attributes are mapped and standardised to provide a coherent definition across the jurisdiction supplies, with associated geometry being cleaned and processed to output a topologically consistent layer of Australia’s cadastral boundaries at a national scale. Additional attributes and geometry have been generated and integrated by Geoscape to support the jurisdictional information as well as to provide convenience in the use and representation of the dataset.

Cadastre is updated and released regularly and has integrated relationships with other Geoscape Products. Further information regarding attributes, quality, coverage and product release details are outlined below.

Linkages

Cadastre is integrated with the following Geoscape products:

  • G-NAF

  • Property

  • Buildings

  • Planning

  • Addressing Services

The joins used to link to these products are shown below, with attributes used in the joins described.

_images/cadastre_linkages.png

Attributes

Lot

The Lot attribute provides information that uniquely identifies the parcel within a plan.

Plan

The Plan attribute provides the legal plan information for a parcel as defined by the jurisdiction. Parcels can share a common plan number or alternatively not have one assigned. Where a plan value has not been assigned there may be source, feature or design reasons.

Parcel ID

The Parcel ID attribute provides a direct lookup for the parcel in the land registry of the associated State or Territory. The creation of Parcel IDs for each jurisdiction is described in the table below.

State

Specific Area

Jurisdiction Value

Notes

ACT

DISTRICT_SHORT + “/” + DIVISION_SHORT + “/” + SECTION + “/” + BLOCK + “/” + UNIT

Derived from the following dataset:

  • 'UNITS'

DISTRICT_SHORT + “/” + DIVISION_SHORT + “/” + SECTION + “/” + BLOCK

Derived from the following datasets:

  • 'BLOCKS'

  • 'STRATUM_BLOCKS'

DISTRICT_SHORT + “/” + DIVISION_SHORT + “//”

Derived from the following datasets:

  • 'ROAD_POLYGON'

  • 'PEDESTRIAN_AREA_POLYGON'

NSW

For Plan Type of Deposited Plan where Section Number is not null: LOTNUMBER + “/” + SECTIONNUM + “/” + PLANNUMBER

Derived from the following dataset:

  • 'LOT'

For Plan Type of Deposited Plan where Section Number is null: LOTNUMBER + “/” + PLANNUMBER

Derived from the following dataset:

  • 'LOT'

For Plan Type of Strata Plan: LOTNUMBER + “/” + PLANLABEL

Derived from the following dataset:

  • 'LOT'

PLAN_LABEL

Derived from the following datasets:

  • 'UNIDENTIFIED'

NT

PAR_LOC + “/” + PAR_LTO + “/” + PAR_PAR + “/” + UNIT_NUMBER

OT

Christmas and

PIPARCEL + “/” + LOT_NUMBER

A substring is used to select the plan element from the PIPARCEL where applicable.

Cocos Keeling Islands

Jervis Bay

DISTRICT_SHORT + “/” + BLOCK

Norfolk Island

LOT + “/” + PORTION + “/” + SECTION

QLD

LOT + “/” + PLAN

SA

PLAN_T + “/” + PLAN + “/” + PARCEL_T + “/” + PARCEL

TAS

PLAN + “/” + LOT

VIC

SPI

WA

PIPARCEL + “/” + LOT_NUMBER

A substring is used to select the plan element from the PIPARCEL where applicable.

Where a land registry requires the input of separate values a “/” has been used to delineate the fields.

Contributor ID

The Contributor ID is a jurisdiction provided identifier that can be used to link directly back to the source data. The associated attribute(s) in the jurisdiction source data for each State or Territory are found in the table below.

State

Specific Area

Jurisdiction Value

Notes

ACT

BLOCK_KEY

Links to the following datasets:

‘BLOCKS’

‘STRATUM_BLOCKS’

ID

Links to the following datasets:

‘ROAD_POLYGON’

‘PEDESTRIAN_AREA_POLYGON

BLOCK_KEY/UNIT

Links to the following dataset:

‘UNITS’

NSW

CADID

NT

PFI

Links to the following datasets:

‘NT_CADASTRE_POLYGONS’

‘NT_CADASTRE_PROPOSED_POLYGONS’

UFI

Links to the following dataset:

NT_UNIT_ADDRESS_POINTS’

OT

Christmas and

PIN

Cocos Keeling Islands

Jervis Bay

BLOCK_KEY

TAS

CID

VIC

PFI

WA

PIN

Source

The name of the State or Territory that the data was sourced from. If a supply did not provide a lot parcel representation associated with the parcels in a strata or stratum plan, then a parcel was generated by Geoscape Australia and assigned a Source value of ‘Geoscape Australia’. These records are always assigned a Parcel Type value of ‘Lot’ and a Base Parcel value of ‘Yes’. These parcels are generated by Geoscape Australia to achieve a complete national visualisation of cadastral coverage. Contributor Status This attribute describes the lifecycle stage of a parcel. The Contributor Status is populated with the value provided by the supplier of the parcel, where this information is provided.

Title Status

The Title Status attribute provides an indication whether the parcel has been ‘Titled’ or ‘Not Titled’ in the jurisdiction’s Land Registry. This attribute is derived from either jurisdictional supplied Contributor Status values where provided, or from an assessment of the provided source tables for a jurisdiction.

OT (Norfolk Island, Cocos (Keeling) Islands and Christmas Island only), QLD, SA, TAS and WA can only have a Title Status of ‘Titled’. Finally, any Geoscape Australia source records will not be assigned a value and will be <null>.

Parcel Type

The Parcel Type attribute can contain values of either ‘Lot’, ‘Strata’, ‘Stratum’ or ‘Road’.

Parcels with a Parcel Type of ‘Lot’ are the most common form of parcels which are not specifically defined by any other Parcel Type.

The Parcel Type ‘Strata’ indicates a horizontal or vertical subdivision of the plan.

The Parcel Type ‘Stratum’ represents a volumetric or stratum plan, which indicates vertical restrictions relating to the parcel.

Road parcels are generally assigned as ‘Road’ which includes but is not limited to roads, road intersections, road pathways, road corridors and crossings. The Northern Territory data does not include Road Parcel Type features, while South Australia does include a small number of Road Parcel Type features but there is generally low coverage of these Road parcels across the state.

Base Parcel

The Base Parcel attribute allows for a simple visualisation of cadastre coverage across all States and Territories without overlapping parcels. Only parcels with a Parcel Type of ‘Lot’ that are not contained by another Lot parcel can be part of the base representation.

Strata Type

A Strata parcel can have a Strata Type of ‘Vertical’ or ‘Horizontal’, or alternatively not have one assigned. Only Parcels with Parcel Type of ‘Strata’ can have a Strata Type value assigned.

A ‘Horizontal’ Strata Type indicates a horizontal configuration of the parcel within a plan, where different units do not sit on top of one another. Examples include dual occupancies (shared wall), separate dwellings on the same strata plan, and townhouses.

A ‘Vertical’ Strata Type indicates a vertical configuration, with units or apartments that are above/below one another. Examples include high-rise apartment building or a unit blocks where there are multiple levels with different units present.

Total Strata Count

The Total Strata Count provides the sum of all unique Strata parcels associated with a particular ‘Lot’ parcel. This attribute is only assigned to parcels with a Base Parcel value of ‘Yes’ and counts parcels with the same Parcel ID as a single Strata (e.g. a unit and disconnected carpark).

There are conditions where Strata parcels do not contribute to the count. These include:

  • If a parcel is Common Property;

  • In Victoria: if a parcel is an accessory lot, reserve, proposed parcel and/or a parcel containing a donut hole(s)

  • In Western Australia, Cocos (Keeling) Islands and Christmas Island: Strata that does not have a unit entitlement; and

  • In South Australia: parcels that are underground.

Horizontal and Vertical Strata Count

The Horizontal and Vertical Strata Count attributes are populated for parcels with a Base Parcel value of ‘Yes’ where horizontal and vertical Strata can be distinguished, following the same inclusion logic as described in Total Strata Count above.

Area

The area of each cadastre polygon in square meters, calculated from the feature geometry using an equal area projection. The total area in square meters can be calculated by summing parcels with a common Cadastre PID.

Data Model

Cadastre Data Model

Data Dictionary

Attribute

Data Type

Description

Primary Key

Mandatory

10 Character Alias

cadastre_polygon_pid

Character String (15)

Unique persistent identifier for the cadastre polygon.

Yes

Yes

CD_PLY_PID

cadastre_pid

Character String (15)

Persistent identifier for the cadastral feature for the life of the lot’s title.

No

Yes

CAD_PID

contributor_id

Character String (20)

An identifier used to link back to the contributor data where the contributor supplies a persistent identifier.

No

No

CNTRB_ID

date_created

Date

The date the record is first introduced to the Geoscape product.

No

Yes

DT_CREATE

date_modified

Date

The latest date that this record has been modified.

No

No

DT_MOD

state

Character String (3)

The abbreviated name of the State or Territory that the cadastre spatially resides within.

No

Yes

STATE

lot

Character String (15)

The lot or equivalent information that identifies the parcel within a plan.

No

No

LOT

plan

Character String (20)

The plan information for a parcel.

No

No

PLAN

parcel_id

Character String (60)

A direct lookup for the parcel in the associated state or territory land registry. This field generally represents a combination of lot and plan style information.

No

No

PARCEL_ID

source

Character String (20)

The State or Territory authority that has provided the source data for the parcel.

No

Yes

SOURCE

contributor_status

Character String (35)

The contributor attribute describing the lifecycle of the parcel where provided.

No

No

CNTRB_STTS

title_status

Character String (10)

An indicator of whether the parcel has been Titled or Not Titled.

No

No

TITLE_STTS

parcel_type

Character String (10)

The type of parcel (e.g. Lot, Strata, Stratum, Road).

No

Yes

PARCL_TYPE

base_parcel

Character String (3)

A ‘Yes’ flag indicates that the parcel is part of the base representation.

No

No

BASE_PARCL

strata_type

Character String (10)

The type of strata (Vertical or Horizontal) flagged for Strata parcel types. Where this information is not known for Strata parcels, the strata type is assigned as a null value.

No

No

STRATA_TYP

total_strata_count

Number (5)

The total number of Strata relating to base_parcel = ‘Yes’ parcels only. Where horizontal and vertical strata cannot be differentiated the total_strata_count is populated but horizontal and vertical strata counts will be <null>.

No

No

TOT_STR_CN

horizontal_strata_count

Number (5)

The count of horizontal strata relating to the base parcel.

No

No

HOR_STR_CN

vertical_strata_count

Number (5)

The count of vertical strata relating to the base parcel.

No

No

VER_STR_CN

area

Number (14,2)

The area in square metres of the polygon.

No

Yes

AREA

geometry

Polygon

The geometry of the polygon.

No

Yes

GEOMETRY

Domain Values

state

Domain Value

Description

ACT

The data is located within the Australian Capital Territory.

NSW

The data is located within the state of New South Wales.

NT

The data is located within the Northern Territory.

OT

The data is located within the Other Territories classification. Other Territories covers the external Australian territories of Cocos (Keeling) Islands, Christmas Island, Jervis Bay and Norfolk Island.

QLD

The data is located within the state of Queensland.

SA

The data is located within the state of South Australia.

TAS

The data is located within the state of Tasmania.

VIC

The data is located within the state of Victoria.

WA

The data is located within the state of Western Australia.

source

Domain Value

Description

ACT

The source data for the record was provided by the Australian Capital Territory Government. Jervis Bay data is sourced from the Australian Capital Territory Government.

NSW

The source data for the record was provided by the New South Wales Government.

NT

The source data for the record was provided by the Northern Territory Government.

OT

The data is located within the Other Territories classification. Other Territories covers the external Australian territories of Cocos (Keeling) Islands, Christmas Island, Jervis Bay and Norfolk Island.

QLD

The source data for the record was provided by the Queensland Government.

SA

The source data for the record was provided by the South Australian Government.

TAS

The source data for the record was provided by the Tasmanian Government.

VIC

The source data for the record was provided by the Victorian Government.

WA

The source data for the record was provided by the Western Australian Government. Cocos (Keeling) Islands and Christmas Island data is sourced from the Western Australian Government.

Geoscape Australia

The data has been created by Geoscape for the purposes of base parcel coverage.

contributor_status

title_status

Domain Value

Description

Titled

A parcel which has a title issued. This is the default value.

Not Titled

A parcel whose boundaries have been sourced from a plan of subdivision (proposed or authorised) prior to the issue of a title.

<NULL>

The parcel has been created by Geoscape Australia for base Lot parcel coverage and has no reference to a title.

parcel_type

Domain Value

Description

Lot

A spatial representation of surveyed land referred to in a land title. This is the most common form of parcel and not specifically defined by any other parcel type.

Strata

Parcel identified in a plan representing a strata subdivision.

Stratum

Parcel identified in a plan representing land as being volumetric or stratum.

Road

Parcel identified in a plan representing land typically set aside for road infrastructure such as roads, intersections between roads, closed roads, road pathways, road corridors and crossings.

base_parcel

Domain Value

Description

Yes

The parcel has been identified as a base parcel. Only parcels with a parcel_type of Lot can be flagged as base parcels. A base parcel is not contained by any other Lot parcel and provides base coverage across each state and territory.

<NULL>

The parcel has been identified as not being a base parcel. Lot parcels contained by other Lot parcels and Strata, Stratum and Road parcel types will have <NULL> values for this field.

strata_type

Domain Value

Description

Horizontal

Parcel in a plan representing a strata subdivision (parcel_type = ‘Strata’) identified to contain a horizontal configuration in general terms.

Vertical

Parcel in a plan representing a strata subdivision (parcel_type = ‘Strata’) identified to contain a vertical configuration in general terms.

<NULL>

Parcel in a plan representing a strata subdivision where the configuration (Vertical or Horizontal) is unknown, or a non-Strata parcel_type (Lot, Stratum, Road) and therefore cannot have a strata type.

Update Frequency

Cadastre is continuously updated and released with the most up to date data available on a monthly schedule.

Data Quality

Positional Accuracy

Cadastre has been created by combining land boundary information from multiple jurisdictional sources. Each jurisdiction has a range of collection methodologies to capture the digital representation of the land parcel boundary. The varying approaches to maintaining the boundaries will contribute to the overall accuracy of Cadastre. As the jurisdiction capture programs improve land boundary accuracy, we incorporate these changes as an update into the product and the positional accuracy is maintained. Geoscape makes minor changes only where they are required to create valid features described in Cadastre Geometry Validity.

Coordinates Referencing the GDA2020 Datum

Spatial features referencing the GDA2020 datum are produced using a coordinate transformation from the GDA94 datum using the following parameters.

shift_x = 0.06155,
shift_y = -0.01087,
shift_z = -0.04019,
rotate_x = -0.0394924,
rotate_y = -0.0327221,
rotate_z = -0.0328979,
scale_adjust = -0.009994

Cadastre Geometry Validity

Cadastre geometry is validated to ensure polygons are a valid representation and free of self-intersection. Issues being detected and resolved include spikes, bow ties, duplicate vertices, null geometries, multipart geometries, and self-contacts. Minor overlaps are also resolved where a cadastre has a base_parcel of ‘Yes’. Overlapping polygons will persist in the product as they can be valid geometries representing the jurisdictions intent. Polygon orientation conforms to the following specifications:

  • OGC Simple Feature Access Specification v1.2.1 [Section - 6.1.11.1]

  • The GeoJSON Specification RFC7946 [Section 3.1.6 dot point 4]

This means the polygon outer boundary will be counter clockwise and the inner boundary will be clockwise for file formats that support the above standards.

Further Comments

Cadastre has been processed to assure all polygons are stored as single part features to improve compatibility with a range of software applications. Due to this there can be a duplication of the cadastre_pid, lot, plan and parcel_id information between separate Cadastre records where there are multiple polygons represented by a single parcel_id.

Extent/Geographic Description

The spatial coverage of Cadastre includes Australia’s land mass and surrounding offshore islands.

The Bounding Box for this data is as follows:

  • North bounding latitude: -8˚

  • South bounding latitude: -45˚

  • East bounding longitude: 168˚

  • West bounding longitude: 96˚

_images/extent_map.png

A detailed description of the coverage for each State and Territory is provided in the table below.

Spatial Reference System

GDA94

Horizontal Datum: The Geocentric Datum of Australia 1994 (GDA94) is the target horizontal datum.

Coordinate System: Geographic Coordinate System Geocentric Datum of Australia 1994 (GDA94).

GDA2020

Horizontal Datum: The Geocentric Datum of Australia 2020 (GDA2020) is the target horizontal datum.

Coordinate System: Geographic Coordinate System Geocentric Datum of Australia 2020 (GDA2020).

Delivery Format

Cadastre is provided at a National and State/Territory level, depending on the file format selected. The data is made available in the File Geodatabase, GeoJSON, ESRI Shapefile and MapInfo TAB formats described below.

Format

National

State/Territory

File Geodatabase

Yes

Yes

GeoJSON

Yes

Yes

ESRI Shapefile

Yes

MapInfo TAB

Yes

File Geodatabase

Format name
File Geodatabase – ESRI™

Specification
This format includes files with the following extensions: *.gdb

Language
English

GeoJSON

Format name
GeoJSON

Specification
This format includes files with the following extensions: *.geojson

Language
English

Note

The GeoJSON specification states that the coordinate reference system for all GeoJSON coordinates is:

“a geographic coordinate reference system, using the World Geodetic System 1984 (WGS 84) datum, with longitude and latitude units of decimal degrees”

Cadastre will be provided with coordinates using the datum selected for download (GDA94/GDA2020) with longitude and latitude units of decimal degrees.

JSON

Format name
JSON

Specification
This format includes files with the following extensions: *.json

Language
English

ESRI Shapefile

Format name
Shape – ESRI™

Specification
This format includes files with the following extensions: *.shp, *.shx, *.dbf
ESRI Shapefile Technical Description, an ESRI White Paper, July 1998. Follow this link: www.esri.com/library/whitepapers/pdfs/shapefile.pdf

Language
English

MapInfo TAB

Format name
TAB – MapInfo Professional™

Specification

This format includes files with the following extensions: *.tab, *.dat, *.id, *.map
The MapInfo TAB format is a popular geospatial vector data format for geographic information systems software. It is developed and regulated by MapInfo as a proprietary format. TAB files support geospatial standards such as Open GIS, the OGC, ISO, W3C and others.

Language
English

Product Versioning

Cadastre versioning is managed through incrementing when there is a change to the product schema or a significant change in data population, these are described further below:

  • A schema change can affect a major or minor increment to the versioning. Additive changes (changes that won’t break customers’ ability to work with the data) will be incremented with a minor version increment, an example is the addition of a new attribute. Removal of attributes or changing the structure of the Cadastre schema will enact a major change to identify that this requires the attention of all customers and partners.

  • Where a significant geography of Australia either has a new population of data for an attribute or is populated from a much higher quality source a minor increment will be applied to the product version.

Therefore, Cadastre versioning will not increment with every data update. Published releases will have a name e.g. ‘May 2021’ and will reference a version of the Cadastre product e.g. ‘1.0’.