A Centralized Cadastre in a Decentralized Environment

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A Centralized Cadastre in a Decentralized
Environment

• Bernie Gunning Service Nova Scotia Municipal
  Relations
• Rick Nyarady - CARIS

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A Centralized Cadastre in a Decentralized
Environment

• Overview of SNS RIMS
• Review of property mapping maintenance using
  CARIS GIS
• Summary of CPD Project Charter
• RIMS CPD data model
• Business process introduced using CPD Source
  Editor
• Conclusion

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Service Nova Scotia Municipal Relations - SNSMR
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Overview of SNSMR

• committed to making government services more
  accessible and more convenient
• maintains the legislative framework in which
  municipalities operate and provides advice,
  assistance and program support to municipalities

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Registry Information Management Services -- RIMS

• Maps and Geographic Information
• Personal Property Registry
• Registry of Deeds
• Land Registration
• Registry 2000

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Land Registration / Registry 2000

• Reforming land tenure system to system of
  guaranteed ownership
• Property Online a subscription web service for
  ownership attributes and cadastral maps

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Review of property mapping maintenance using
CARIS GIS
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A Quick Bit of History

• Property Mapping initially compiled on
  conventional maps at various scales
  11000-110000 three datums 68, 76, ATS77
• Digital conversion using CARIS GIS into 3-degree
  MTM on ATS77 datum, 1cm resolution

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Quick History

• Mapping done on best info available basis
• Accuracy/confidence ranges from
  survey-tied-to-grid to best guess
• Key component is overall improvement as better
  data available over time

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Quick History

• Digital conversion included re-windowing to
  management units
• Odd-shaped collections of polygons
• Eliminated map sheet edge match problems

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Typical Management Unit file
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Existing CARIS GIS data

• Parcels comprising polygon(s) keyed to parcel
  identifier (PID) in graphics and several
  attribute tables
• Line features coded as to source, theme, boundary
  type, data quality (attributes parked in
  feature codes)

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Existing CARIS GIS data

• Other features include admin boundaries, street
  hydrography annotations, parcel connector text
  leader symbols, easement boundaries, centre lines
  for civic addressing

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Existing CARIS GIS procedures ...

• Graphical changes requested via drafting
  transmittals
• Primary source of change is subdivision/re-survey
  plans
• Important secondary source is correction of
  missing/erroneous data

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Existing CARIS GIS procedures ...

• Paper survey plans digitized feature coded
  using legacy COGO package
• Exported to DXF
• Imported into management unit (CARIS GIS files)
• Knitted into existing fabric

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Existing CARIS GIS procedures ...

• Superceded data is crudely date stamped using
  user/theme numbering
• Crude checkout/checkin facility based on ftp
  down/up load is barely adequate
• QC data distribution process at NSGC means
  extra time lag

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Property Online Updates

• Each day, any files that have been changed that
  day are uploaded
• Data is projected to 6-degree UTM, NAD83, then
  loaded into one shape file covering the province

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Existing Workflow
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CPD Pilot Project Objectives

• Move from file-based locking to records-based
  within Oracle Spatial
• Use the primitive spatial data types operations
  defined in 9i
• Replicate CARIS GIS spatial operators
• Support existing systems

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Project Deliverables

• Reduced time lag for graphics updates
• Automated Checkout/Checkin
• More robust data transfers
• Reduced amounts of data locked
• Efficient data processing structures
• Extraction supports Property Online

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Project Deliverables - tools

• CARIS DXF import
• Archiving before picture
• Deletion, extension, snapping, clipping,
  intersection, network/polygon topology
• Maintain non-topological arcs cartographic
  annotation

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Project Deliverables tools data

• Ability to handle pending data changes mask
  until effective
• Enable maintenance of property maps at least as
  well as CARIS GIS
• Data schema, catalogue, mappings to CARIS GIS
  data

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RIMS CPD data model

• Objects A real world entities comprised of one
  or more feature objects describing the entity
  and a spatial object describing the geometry.
  In the context of the Nova Scotia cadastral
  fabric there an object is comprised of one
  feature object and one spatial object

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RIMS CPD data model

• Feature Object A Feature Object describes an
  object and is comprised of a description (what is
  the object), attributes and associated data
  type(s) defined by the spatial object. Feature
  objects developed for the Nova Scotia project
  were based on GIS feature standards comprising
  feature codes, themes and source identifers

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RIMS CPD data model

• Spatial Object A Spatial Object defines the
  geometry of an object that is point, line, area
  or text.
• The exercise resulted in 14 feature objects
  supported by 18 attribute classes

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Part of the Feature Catalogue
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Data Loading
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Data Loading

• 79 Management Units
• 168,342 parcels
• Feat2obj for CARIS to CPD conversion
• CPDLOADER Oracle database loader
• GOIMPORTER text importer/resolver

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Data Loading processing time
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REVISED WORKFLOW USING CPD

• COGO process same uses Survey Loader app to
  create objects in hob file, incorporates
  transformation
• Create workspace using window define by hob
• Extract/prepare to lock data in DB, using
  workspace coverage

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REVISED WORKFLOW USING CPD

• Create archive copy of data to be changed
• Knit fabric to improved new data, or fit new
  data to existing superior data
• Mark as pending as appropriate
• Most changes require moving arcs polygon edges
  exactly the same way topology preserved through
  most operations

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REVISED WORKFLOW USING CPD

• Rollback/whoops! button available anytime
  during client operation
• Workflow permits separation of editor and
  validator roles
• Commit writes all changes to Oracle

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REVISED WORKFLOW USING CPD
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Conclusion

• CPD is feasible as a functional replacement for
  most of CARIS GIS
• Transition expected to be smooth low functional
  learning curve, higher curve to grasp new data
  structures
• Ongoing improvements identified during pilot
  expected soon

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Questions .