Presentation on theme: "Dudley Metropolitan Borough: A Land and Property DNF Case Study Brian Higgs Corporate GIS Manager."— Presentation transcript:
Dudley Metropolitan Borough: A Land and Property DNF Case Study Brian Higgs Corporate GIS Manager
2 February 2006DNF System Suppliers Forum Introduction What weaknesses exist in our current position Why we have chosen to change How we are implementing the project The process we have adopted The results so far Benefits identified
3 February 2006DNF System Suppliers Forum The Problem Questionable data integrity Creating and maintaining spatial data continuously but not CONSISTENTLY since 1978 GIS technologies encourage REPLICATION contributing to our current holding of 1.5 million spatial records External factors such as LandLine annual refresh and PAI have moved the map beneath our data Lack of metadata means we are unable to determine its fit-for-purpose status for years strived to place GIS centric to how we manage our information but now find it gets in the way so need to move it to what it is good at, a facilitating role.
4 February 2006DNF System Suppliers Forum Why change One option do nothing and continue to invest in the problem, manage risk and dream of retiring Why we decided not to go with this option: –Wider dissemination of the information including Public Access make risk management less viable in that you do not know to what purpose it is being put –More automated business processes remove the opportunity for manual checking. Also, this type of behaviour would not be in line with Gershon thinking –Greater pressure for quality information to support informed and evidenced decision making –Need to park the map when it has nothing to contribute in order to: communicate spatial relationships more through business critical access channels such as the front office Make the spatial nature of the question transparent to lay users Facilitate more flexible systems integration
5 February 2006DNF System Suppliers Forum Our Approach Reviewed our experience of mainframe land and property systems and decided to re-adopt some elements of best practice such as: –Single centralised view of a property –Linked application data by association –Imposed business rules to protect the linkage MasterMap gave us the opportunity to consider the migration of our digitised LPG extents to association with TOIDS Migration Process to have 3 phases: –Residential, to give greatest return and likely to be easiest –Other addressable objects –Non-addressable objects Unaware of DNF at the time but had a you show me yours and I will show you mine meeting with O.S. and discovered that our proposed approach was largely compliant with the principles of DNF
6 February 2006DNF System Suppliers Forum The Process
7 February 2006DNF System Suppliers Forum The results of work to-date ProcessedResults PostcodesLPG ItemsCompletedIncompleteImpossible Overall % Complete Phase 1: MasterMap November 2001 60151333988715642894334865.34 Phase 2: Failures from Phase 1 against MasterMap January 2004 6015462421365429523306529.53 Combined Results 601513339810081029523306575.57
8 February 2006DNF System Suppliers Forum Failure Profile TypeExamplesNumbers in sample* Projected numbers %Solutions LPG IssuesCorrespondence not close enough; LPG captured incorrectly; conflict between inferred links 210813125Correct LPG MasterMap IssuesMasterMap attribution incorrect; missing inferred links (e.g. between 2 semi-detached houses); inferred links in wrong places; missing boundaries 121468615Short term – create user TOIDs; long term – get MasterMap changed Outside MasterMap Specification Missing inferred links (corners, shared drives and paths, amenity land 4851877559Create user TOIDs or consider changing LPG business rules OtherData run against different versions of MasterMap 93481Rerun process on incorrect polygons *sample consisted of 148 residential postcodes and 3515 LPG items (825 LPG failures)
9 February 2006DNF System Suppliers Forum Benefits Opportunity to set up process to visit all data, clean and remove replicated records by cross-referencing Introduces record level metadata enabling users to make judgements on whether data is fit for their purpose or not. Enables support of meaningful data audit trails Improved data capture; –linking to existing information where possible –faster, more accurate and consistent process for new capture Reduces impact of data integrity erosion by offering a more effective means of managing change and retaining quality. Establishes a G.I. Reference Engine
10 February 2006DNF System Suppliers Forum Thank you for your attention
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