Title: digital cadastral databases
1digital cadastral databases
Wolfgang Effenberg
2 cadastral map
land developer
cadastral system
3cadastral map description
- topographic map
- graphical cadastral map
- survey accurate cadastral map
- legal cadastral map
- coordinated cadastre ?
4UK - Scotland
5Austria
original 1820-1824digital map 1994
6Austria
7Canberra
8Victoria
9observations 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
10cadastral 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
11spatial cadastres
- England - no cadastral map
- large scale topographic maps are used to map the
general parcel boundary if required
12spatial cadastres
- England - no cadastral map
- Australia -Vic NSW-graphical cadastre
- that maps the entire cadastral fabric to
prescribed accuracies
13spatial cadastres
- England - no cadastral map
- Australia -Vic NSW-graphical cadastre
- Denmark - controlled graphical cadastre
- increasingly utilising survey accurate
measurements tied to national control
14spatial 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.
15spatial 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.
16cadastral content - spatial
- parcel boundaries
- easements or right of ways
- property boundaries
- building footprints
- land use boundaries
- occupation boundaries
- cadastral administration boundaries
- general administration boundaries
17cadastral content - aspatial
- parcel identifer
- survey identifer
- property identifier
- street names
- street address
- accuracy indication
18Uses of spatial cadastral data
- index
- land market
- base map
- councils and utilities
- display
- census data
- analysis
19infrastructure? 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
20spatial cadastral system
cadastral map
land developer
?
21maintenance - update and upgrade
- distribution of changes
-
- changes to spatial cadastre
maintain digital cadastral map map custodian
22spatial 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.
23spatial 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.
24spatial cadastral maintenance
- encompasses both update and upgrade
- where the update and the upgrade may occur
simultaneously - controlled update
25spatial cadastral system
cadastral map
land developer
Australia
26institutional issues - DCDB creation
- surveyor general
- crown land
- topographic mapping
- surveyors
- land titles offices
- freehold land
- surveying and mapping
- water authorities
27Australian 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
28DCDB maintenance
- incremental flow of spatial data
- different institutional issues
- differing business requirements
- cost recovery
- infrastructure role
29analogue spatial data system
customers
state digital cadastre
land titles office
local government
utilities
surveyor
30data flow diagram for spatial cadastral data
31transfer of data - network
32cadastral 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
33cadastral 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
35observations of Australian DCDBs
- Australia wide DCDB
- graphical cadastre
- high GIS focus
- state by state solution
- meta data
- accuracy upgrade
- incremental updates
36?