Queensland Digital Cadastral Dataset

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Queensland Digital Cadastral Dataset

• DCDB National Workshop

Bill Gilder - Steve Tarbit
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Spatial Information Group
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Spatial Information Group
Purpose

• Maintain, improve and provide authoritative
  spatial and scientific infrastructure for
  government, industry and community wellbeing and
  development.

The Spatial Information Group

• Provides strategic and policy direction for
  spatial information and positioning
  infrastructure in Queensland.
• Leads and coordinates the management and
  acquisition of the States framework spatial and
  scientific datasets.
• Develops and maintains infrastructure which
  provide access to high quality and timely spatial
  and scientific data.
• Produces and promotes relevant products and
  services for government, industry and the
  community through client-friendly means.

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Spatial Information Group

• Spatial Policy provides strategic and policy
  direction for spatial information and positioning
  infrastructure in Queensland.
• Data Management and Acquisition Unit (DMA) leads
  and supports the acquisition and management of
  the States framework spatial and scientific
  datasets.
• Spatial and Scientific Systems (SaSS) Unit makes
  spatial and scientific data and infrastructure
  available for all DERM staff and the public.
  Functions provided by the business unit include
  information system support, innovation,
  development and review.
• Client Outcomes focuses primarily on the
  customers of the Spatial Information group. The
  unit also provides a range of services for the
  department, related to the broader management of
  products and services.

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State Digital Cadastral Dataset
Section 46, Survey and Mapping Infrastructure
(SMI) Act 2003

• The digital cadastral dataset is required to
  contain
• A digital graphic representation of each parcel
  of land in the State and,
• A unique description for each parcel of land and
  the approximate coordinates for the corners of
  the parcels.

• Parcels of land shown on a building format or
  volumetric format plan are not required to be
  included.

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Creation of Queensland Digital Cadastral Database
(DCDB)

• 1983 department initiated the capture of the
  cadastral boundaries from working maps
• Map scales of 12,500 to 1250,000
• Pictorial representation of boundaries to be used
  for administrative purposes only
• Attribute information captured for each parcel
• 1992 Notings system completed workingmaps no
  longer required

Initial positional accuracy dependant on scale of
map sheets used at capture and precision of
digitising. Accuracies ranged from 1.5 metres to
637 metres
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Queensland DCDB

• Contains over 2 million cadastral lots (2.9
  million parcels)
• Has evolved to become an essential framework
  dataset, with accuracy expectations far exceeding
  the original intent
• Complete cadastral layer of lots, road and
  watercourse
• Secondary layers and administrative boundaries
• Used within all levels of government andprivate
  industry
• Integral to departmental land managementpractices
  , land administration and titling
• Various delivery methods-
• DVD, SMIS, online (QGIS)

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Positional Upgrade
LGA Partnership (Data Enhancement Agreements)

• Commenced 1995
• Accuracy intent - 0.1 to 0.2 metres for asset
  management
• Generally in urban/peri urban areas
• 16 LGAs completed
• 9 LGAs in progress

Graphical Relativity Project

• Commenced 2004
• Positional upgrade in rural and remote areas of
  the state
• Using 140 000 orthophoto images and rectified
  satellite imagery
• Projected accuracy is 5 metres using orthophoto
  and 25 metres using satellite imagery

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Positional Upgrade
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Positional Upgrade
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Unsurveyed Areas
Surveyed

• 97 by parcel
• 40 by area

Unsurveyed

• 3 by parcel
• 60 by area

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Survey Control Dataset
Permanent Survey Mark Statistics SCDB Total 156,600 Permanent Survey Mark Statistics SCDB Total 156,600 Permanent Survey Mark Statistics SCDB Total 156,600 Permanent Survey Mark Statistics SCDB Total 156,600
Co-ordinated (4th Order or better) Cadastrally Connected 20,700 13
Co-ordinated (4th Order or better) Not Connected 10,300 7
Not Co-ordinated Cadastrally Connected 90,600 58
Not Co-ordinated Not Connected 35,000 22
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Maturity of the Digital Cadastral Dataset

• Graphical Maintenance Environment

• Point in time correction or movement
• No observation audit trail
• Reliant on operator judgement

Numerical Maintenance Environment

• Rigorous maintenance environment
• Adjusted using recognised survey methodologies
• Considers reinstatement hierarchy of evidence
• Lineage from coordinates to observations
• Repeatable measure of quality

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ePlan Initiative
EARL Stage I

• Production plan auditing workflow
• PIDs added to DCDB June 2008
• All registrable plans captured on lodgement
• Automated validation of plan information

EARL Stage II

• Cadastral Infrastructure Search
• External digital lodgement and validation of
  survey plans (CIF)
• Anticipated release July 2011

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CIF Observations
Survey Plan
CIF Observations
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Cadastral Point Identifiers
Survey Plan / CIF
Digital Cadastre
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Point Position History
Digital Cadastre
Points Dataset
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Numerical Upgrade Pilot

• Undertaken in conjunction with Ergon Energy
• Validate positional accuracy of Ergon Energy
  imagery
• Investigate and report on
• Sources of information for an adjustment
• Alternate survey plan capture methodologies
• Alternate adjustment engines
• Interfacing adjustment engine with existing
  systems
• Storage of adjustment metadata
• Upgrade DCDB within part of Emerald

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Adjustment Components
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Emerald SIP Capture Metrics

• 169 cadastral infrastructure files
• 1472 current parcels
• 1198 base lots
• 274 easements
• 6593 points connected (Pids)
• 498 additional points created
• 639 new connections

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Adjustment Information Flow
CIF - observations intent SPDB - point index
position DCDB - topology currency SCDB - control
DCDB
SCDB
SPDB
CIF
Build Input Process
DynaNet
DynaML
Meta
Load Results Process
ADJ
SPDB
(Archive)
DCDB
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Methodologies Trialled
ESRICadastral Editor
Fabric
DynaNet
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Adjustment Considerations
Unsurveyed Areas

• 3 of base lots in DCDB have one or more
  unsurveyed boundaries
• This amounts to some 60 of the State by area
• Survey observations may exist on other plans

Misalignment of Boundaries

• Resolving identified issues

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Adjustment Considerations
Multiple Adjustment Methodologies

• Survey information available
• Unsurveyed boundaries
• Age of parcels
• Survey methods used
• Monumentation placed
• Rate of subdivision
• Homogeneous cadastre
• Ad-hoc development
• Natural boundaries discontinuities

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Thats All Folks