Maintaining Data Integrity

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Maintaining Data Integrity

• Kendis Scharenbroich
• GIS Consultant
• Pro-West Associates
• 14th Annual MN GIS/LIS Consortium

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Common Editing Issues

• Linear errors
• Overshoots/undershoots
• Utility networks
• Road networks
• Polygon errors
• Gaps/overlaps
• Parcels
• Land use/zoning
• Tabular errors
• Incorrect spellings
• Incorrect data

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Geodatabase TopologyPutting the power into your
hands

• Topology Rules
• Preset rules to define topological relationships
  to ensure connectivity, adjacency and coincidence
• Can be changed at any time
• Topology Tools
• Maintain spatial relationships
• Toolbar and Tasks

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Getting Started

• Overall geodatabase design
• Data Models
• Planning/testing
• ArcEditor/ArcInfo
• Personal/SDE geodatabases
• Feature Dataset

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Creating Topology

• Rules
• Land use boundaries overlap parcel boundaries
• Manholes overlap sanitary line endpoints
• Cluster Tolerance
• Min distance where vertices within tolerance are
  snapped
• Ranks
• Control what features move during validating
• Surveyed points will not move (snap) during the
  validation process

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Validating

• Validate edited features using set topology rules
• Evaluate rules/tolerance and generates error
  notifications
• Snaps vertices using set cluster tolerance and
  ranks

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Create a New Topology

• Created in ArcCatalog
• Created within a Feature Dataset
• Topology Wizard
• Allows user to set Rules, Ranks, Tolerance, and
  perform initial Validation

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Final Topology
When added to ArcMap, will show errors from the
validation process
Complete Listing of Topology Rules C\Program
Files\ArcGIS\Documentation
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Managing Topologies

• Right click on the Topology in ArcCatalog

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Topology ToolsMaintenance

• Standard toolbar
• Used in an editing environment in ArcMap
• Use in conjunction with Topology Tasks in Editor
  Toolbar

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Editor ToolbarMaintenance

• Topology Tasks
• Modify, Auto Complete Polygon and Reshape
• Allows user to use basic editing tools to alter
  vertices, replace lines, add adjacent polygons or
  alter existing polygons
• Use in conjunction with the Topology Edit Tool on
  the Topology Toolbar
• Remember
• Set snapping and snapping tolerance

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Flexible Editing

• Topology edit tool
• Allows for editing shared boundaries
• Builds a temporary topology cache within a given
  extent
• Faster performance
• Must use each time your extent changes
• Show shared features tool
• Move a boundary without effecting shared
  boundaries (temporary)
• Parcels land use
• Parcels and easements

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Altering a Shared Boundary

• Click on the Topology Edit Tool and click on map
• Creates temporary topology in extent
• Click on an edge
• Choose a Topology Task from the Editor Toolbar

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Shared Features Tool

• Uncheck the feature class you want to move
  independent of the others

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Validate Fix

• Validate after editing is complete
• Errors are highlighted
• Click the Fix Error button
• Select a feature and right click
• Fix
• Mark as an Exception
• Do Nothing

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Process in Review

• Create Topology
• Edit Topology
• Validate Topology
• Fix Topology
• Repeat 2-4 as needed

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Map Topologies

• Formally known as Integrate
• Not the same as geodatabase topologies
• Topology used in ArcView
• Shapefiles/feature classes must be in the same
  folder
• A temporary topology with no preset rules

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Editing Shared FeaturesShapefiles

• Click the Map Topology button
• Click Topology Edit Tool and click on map
• Select Reshape Edge from the Topology Tasks list
• Click on the edge you want to move
• Use the Sketch Tool to draw a new edge
• Right click finish sketch

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Reshape A Shared Edge
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Both Boundaries Move
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Data Entry Errors

• Geodatabase
• Domains
• Create lists of valid descriptions
• Create lists of valid numerical ranges
• No More Junk Data!

Main Line Trunk Force Main ?? Abandon Abandn Diam
eter 8 Diameter 800
Utility Network
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Further Customization

• Data entry via Attributes button
• Uses both domains normal attribute editing
  functions

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THANK YOU!
Questions?