G-NAF Metadata Statement

  • File Identifier: DD43BD26-4043-45BD-8D83-1FA70A4F8B3F
  • Hierarchy Level: dataset
  • Hierarchy Level Name: dataset
  • Standard Name: ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information – Metadata
  • Standard Version: 1.1
  • Date Stamp: 2016-12-13
  • Resource Title: G-NAF Dataset
  • Alternate Resource Titles: G-NAF, Geocoded National Address File, Geographic National Address File, Open G-NAF
  • Metadata Creation Date: 2006-03-03
  • Metadata Published Date: 2016-12-13
  • Metadata Revision Date: 2016-12-13
  • Metadata Language: English
  • Metadata Character Set: utf8

Abstract

The G-NAF Product Description (an ISO 19131 compliant description) provides an optimised quality geometric description and a set of basic attributes of the Address Index for Australia. G-NAF incorporates all addresses included in contributors’ data that are regarded as complete addresses. G-NAF data is revised on a regular basis.

Purpose

Addresses were once exclusively related to properties (e.g. where a bill should be sent for a utility service or rates notice). In a digital world, the use and purpose of addressing has changed. Addresses are now used to label land parcels and properties as well as for locating assets such as ATMs, tree plantations, reserves and substations. Official addresses may be considered as those that are recognised and recorded by an authoritative body such as a land agency. In addition to official addresses, there are also “unofficial” or “in-use” addresses that may exist and be widely used and recognised by the community. Addressing is not always simple and can be extremely challenging and complex.

  • Name of Individual: Anthony Hesling
  • Organisation Name: PSMA Australia Ltd
  • Role: pointOfContact
  • Telephone: +61 2 6260 9000
  • Facsimile: +61 2 6260 9001
  • Delivery point: Unit 6, 113 Canberra Ave., Griffith, ACT 2603, Australia

G-NAF uses existing and recognised address sources (referred to as contributors) from the state and territory government land records and Commonwealth government agencies. A rigorous process is used that involves textual address comparison, matching and geospatial validation to provide both national consistency and national coverage.

Maintenance activities are triggered by PSMA receiving updated address data from data contributors according to an agreed delivery schedule. At present, this schedule defines a quarterly update process.

During the maintenance phase, contributed addresses are analysed and compared to existing records in G-NAF. This analysis and comparison gives rise to new records being inserted and existing records being updated or retired.

The G-NAF maintenance pre-process takes the input files from the PSMA reference datasets and contributor data and performs processing prior to data being processed by the G-NAF maintenance software. Pre-processing is used to describe the following activities:
– Mapping from the contributor model to G-NAF model (with parsing as necessary)
– Application of rules that make corrections to misspellings, abbreviations and erroneous characters
– Application of updates to suburb data and road names propagating the changes through all affected parts of the data.

The G-NAF maintenance software receives the data from the pre-process phase. All the contributed addresses from each jurisdiction are cleansed, compared and merged into the normalised G-NAF maintenance model.

The core maintenance processing consists of the following:
– Address scrubbing
– State-Locality validation and geocoding
– Street validation
– Street geocoding
– Address geocoding
– Merging (merge criteria and confidence levels)

A further series of processing occurs for the following steps:
– Post merge processing (including validation processes)
– Primary / Secondary maintenance
– Alias / Principal maintenance
– Geocode maintenance
– Update address attributes (update attributes not in core processing)
– Update address links (i.e. contributor mapping, mesh blocks, default geocode)
– Verify G-NAF data (i.e. conformance with data model)
– Data export to integrated maintenance database

For an address to be included in G-NAF, it must be a “complete” entry. Complete equals:
– Must include a matched locality
– Must include a street name
– Must contain either a valid number_first or a lot number

G-NAF is reliant on other PSMA datasets. PSMA’s Administrative Boundaries and PSMA’s Transport & Topography datasets need to be completed before G-NAF production can commence.

The Mesh Block data is sourced from the Australian Bureau of Statistics (ABS) and is part of their Australian Statistical Geography Standard (ASGS).

Jurisdictions:

  • Australia
  • Australian Capital Territory
  • New South Wales
  • Northern Territory
  • Queensland
  • South Australia
  • Tasmania
  • Victoria
  • Western Australia
  • BOUNDARIES-Administrative
  • BOUNDARIES-Cultural
  • HUMAN-ENVIRONMENT

Topic Category

  • Boundaries
  • Structure
  • Planning
  • Cadastre
  • Status: onGoing
  • Maintenance and Update Frequency: quarterly

GDA94

Vector

Classification: unclassified

  • Identifier: license
  • Annotation: Licences are available from PSMA Distribution Pty Ltd (for PSMA Resellers), PSMA Resellers and the Commonwealth of Australia represented by the Department of Prime Minister and Cabinet (see http://data.gov.au/dataset/19432f89-dc3a-4ef3-b943…).
  • Identifier: copyright
  • Annotation: All copies must acknowledge copyright by including the notice “ © PSMA Australia Ltd ”
  • Identifier: copyright
  • Annotation: All copies must acknowledge copyright by including the notice “ © PSMA Australia Ltd ”

North Bounding Latitude: -8 South Bounding Latitude: -45 West Bounding Longitude: +96 East Bounding Longitude: +168

  • Identifier: AUS
  • Identifier: AUSAAT