DCDB National Workshop Sydney 2010 Geoscience Australia Utilising Digital Cadastre David Campbell...
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DCDB National Workshop Sydney 2010 Geoscience Australia Utilising Digital Cadastre David Campbell National Geographic Information Group DCDB National Workshop Sydney 2010
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Transcript of DCDB National Workshop Sydney 2010 Geoscience Australia Utilising Digital Cadastre David Campbell...
DCDB National Workshop Sydney 2010
Geoscience Australia Utilising Digital Cadastre
David CampbellNational Geographic Information Group
DCDB National Workshop Sydney 2010
DCDB National Workshop Sydney 2010
GA and the DCDB Digital Cadastre Data is utilised as a valued reference
source across many project areas within Geoscience Australia. However, GA is neither a creator or maintainer of digital cadastre.
Digital cadastre data is sourced from the States & Territories, and PSMA’s national dataset.
Two GA project activities using the DCDB in different ways…
• National Geographic Information Group (NGIG)• National Exposure Information Systems (NEXIS)
DCDB National Workshop Sydney 2010
The DCDB and Topographic Information
The National Geographic Information Group (NGIG) utilises the DCDB as a valued contextual reference source in the gathering of topographic information. For example, the DCDB viewed over imagery provides context in such areas as…
• Recent land sub-division a pointer of new development and associated infrastructure activities
• Roads falling within road easements an indication of public versus private road
• Positioning of high voltage electricity transmission lines along easements
• Land tenure indication of land use
• Alignment of boundaries eg National Parks, Reserves, Fence lines
DCDB National Workshop Sydney 2010
National Topographic Initiative Commonwealth/State Collaboration
• Capture once, use many – sharing of information between State/Territory jurisdictions
• Enhanced positional accuracy and greater number of attributes stored in GA’s topographic database
• Different topographic specifications used across jurisdictions
Cadastre assists in acquiring greater level of accuracy and attribute information when working with other data sources as part of topographic revision
DCDB National Workshop Sydney 2010
Cadastre and the National Exposure Information System (NEXIS)
NEXIS Project Description…..
NEXIS is being developed to provide consistent exposure information to support regional and national risk assessments of buildings and infrastructure to natural hazards.
NEXIS was created in response to COAG reform Commitment 2 – “establish a nationally consistent system of data collection, research and analysis to ensure a sound knowledge base on natural disasters and disaster mitigation”, Geoscience Australia’s (GA’s) Risk & Impact Analysis Group is working on the development of the NEXIS.
The DCDB is critically important for the part it plays in the NEXIS Project.
DCDB National Workshop Sydney 2010
Residential Commercial Industrial
LatitudeLongitudeAddressBlock sizeFootprint area
LatitudeLongitudeAddressBlock sizeFootprint area
LatitudeLongitudeAddressBlock sizeFootprint area
Construction typeFloor areaRoof typeWall typeStoreysAge
Construction typeFloor areaRoof type Wall typeStoreysBasementCar parksAge
Construction type Floor areaRoof typeWall typeAge
ANZSIC categoryNo. BusinessesStructural value
ANZSIC categoryNo. Businesses Structural value
Income groupNo. ResidencesNo. PeopleStructural valueContent value
Structural
Demographic/
Economic
Spatial
Information required by NEXIS
DCDB National Workshop Sydney 2010
Cadastre and the National Exposure Information System (NEXIS) – cont.
NEXIS uses PSMA cadastre to calculate….
• Type of building (SH, SD, etc) by number of GNAF and Cadastre parcel size
• Block size
• Foot print (needed to calculate building replacement value)
DCDB National Workshop Sydney 2010
Cadastre and the National Exposure Information System (NEXIS) – cont.
NEXIS uses cadastre directly from the States to….
• Calculate building age from the parcel registration date
• Extract tenure type
• Provide a contact to discuss queries & clarify issues
DCDB National Workshop Sydney 2010
Cadastre and the National Exposure Information System (NEXIS) – cont.
NEXIS - Issues with the DCDB include……
• Currency
• Inconsistency across jurisdictions
• Spatial and attribute errors found
• Lack of attributes in PSMA Cadastre
• Error reporting process – point of contact with the jurisdictions
DCDB National Workshop Sydney 2010
Conclusion: Cadastre is a valued reference source, supporting informed decision making across a number of GA project activities, which in turn allows for informed decision making by Government and non-Government alike in such areas as infrastructure, resource & emergency management.
