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digital cadastral databases

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Title: digital cadastral databases


1
digital cadastral databases
Wolfgang Effenberg
2
cadastral map
land developer
cadastral system
3
cadastral map description
  • topographic map
  • graphical cadastral map
  • survey accurate cadastral map
  • legal cadastral map
  • coordinated cadastre ?

4
UK - Scotland
5
Austria
original 1820-1824digital map 1994
6
Austria
7
Canberra
8
Victoria
9
observations of spatial cadastres
  • tradition of cadastral maps
  • public access
  • accuracy of cadastral maps
  • multi purpose cadastral maps
  • spatial data infrastructure
  • differing institutional roles
  • common digital issues

10
cadastral data components
  • register of parcel related information
  • register of control points
  • individual surveys relating to parcel boundaries
  • cadastral map (DCDB)
  • vs FIG statement - textual and spatial

11
spatial cadastres
  • England - no cadastral map
  • large scale topographic maps are used to map the
    general parcel boundary if required

12
spatial cadastres
  • England - no cadastral map
  • Australia -Vic NSW-graphical cadastre
  • that maps the entire cadastral fabric to
    prescribed accuracies

13
spatial cadastres
  • England - no cadastral map
  • Australia -Vic NSW-graphical cadastre
  • Denmark - controlled graphical cadastre
  • increasingly utilising survey accurate
    measurements tied to national control

14
spatial cadastres
  • England - no cadastral map
  • Australia -Vic NSW-graphical cadastre
  • Denmark - controlled graphical cadastre
  • Australia (ACT) - survey accurate cadastre
  • not part of the legal land titling or land
    register documentation.

15
spatial cadastres
  • England - no cadastral map
  • Australia -Vic NSW-graphical cadastre
  • Denmark - controlled graphical cadastre
  • Australia (ACT) - survey accurate cadastre
  • Austria - legal survey accurate cadastre
  • the digital cadastral map is the legal
    representation of the parcel boundary.

16
cadastral content - spatial
  • parcel boundaries
  • easements or right of ways
  • property boundaries
  • building footprints
  • land use boundaries
  • occupation boundaries
  • cadastral administration boundaries
  • general administration boundaries

17
cadastral content - aspatial
  • parcel identifer
  • survey identifer
  • property identifier
  • street names
  • street address
  • accuracy indication

18
Uses of spatial cadastral data
  • index
  • land market
  • base map
  • councils and utilities
  • display
  • census data
  • analysis

19
infrastructure? multipurpose?
  • multipurpose cadastre
  • to service the widest range of users and
    innovative uses outside it traditional land
    tenure role
  • infrastructure component
  • to facilitate the integration of data and support
    spatial information business systems critical to
    sustainable economic, social and land development

20
spatial cadastral system
cadastral map
land developer
?
21
maintenance - update and upgrade
  • distribution of changes
  • changes to spatial cadastre

maintain digital cadastral map map custodian
22
spatial cadastral updates
  • recording all new legal subdivisions
  • ensuring map completeness including recognised
    backlog or holes in the map
  • inclusion of a proposed or planning data or layer
    to secure planning spatial cadastral.

23
spatial cadastral upgrades
  • increase in spatial accuracy of any part of the
    cadastre
  • the inclusion of survey control and measurements
  • alignment of the cadastre with topographic
    features
  • changes in spatial data models to introduce (or
    delete) entities
  • generation of topological spatial structures
  • inclusion of a historical layer to allow
    verification of new parcel creation
  • unique feature identification for all spatial
    entities.

24
spatial cadastral maintenance
  • encompasses both update and upgrade
  • where the update and the upgrade may occur
    simultaneously
  • controlled update

25
spatial cadastral system
cadastral map
land developer
Australia
26
institutional issues - DCDB creation
  • surveyor general
  • crown land
  • topographic mapping
  • surveyors
  • land titles offices
  • freehold land
  • surveying and mapping
  • water authorities

27
Australian state DCDBs
  • digistised from best available paper maps
  • urban, rural and metro
  • varying accuracy
  • sourced from different bodies
  • different data emphasis
  • post title product
  • business focus

28
DCDB maintenance
  • incremental flow of spatial data
  • different institutional issues
  • differing business requirements
  • cost recovery
  • infrastructure role

29
analogue spatial data system
customers
state digital cadastre
  • organisations

land titles office
local government
utilities
surveyor
30
data flow diagram for spatial cadastral data
31
transfer of data - network
32
cadastral update - issues solutions
  • currency
  • planning data
  • crown lands
  • back log
  • incremental updates
  • shifting cadastre
  • pricing
  • proposed layer
  • digital lodgment
  • incremental updates
  • unique feature identification (ufi)
  • version control
  • mirror sites
  • pricing review

33
cadastral upgrade - issues solutions
  • accuracy
  • loss of accurate data
  • topographic alignment
  • data model
  • topology
  • parcel/property
  • building footprint
  • aspatial attributes
  • street addressing
  • standards
  • cooperative ventures
  • institutional reform
  • organisational integration
  • new technology
  • topology
  • point level ufi
  • parcel and property
  • seamless database
  • attributes review

34
digital environment
Surveyor/ Developer
Electricity
Gas
Telecoms
Digital Spatial Planning
Water
LocalCouncils
Digital Lodgement
E-Commerce
Incremental updates
Land TitlesOffice
State DCDB
Viewing Internet
Searching Delivery
Spatial Data Customers
35
observations of Australian DCDBs
  • Australia wide DCDB
  • graphical cadastre
  • high GIS focus
  • state by state solution
  • meta data
  • accuracy upgrade
  • incremental updates

36
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