Topologias

ArcGIS Geodatabase Topology
and Quality Assurance
Working with Topology to identify
and review errors

Vermont Spatial Data Partnership
July 2006 Roundtable

Outline
• Creating GeodatabaseTopology
• Topology toolbar, Topology Error
Inspector tool.
• Reviewing “dangles”, “pseudo nodes”,
gaps & overlaps in polygons, other errors
• “Export Topology Errors”, ESRI sample
• VBA codesample for reviewing dangles
Vermont Spatial Data Partnership
July 2006 Roundtable

Creating Geodatabase Topology
•
•
•
•

Requires ArcEditor or ArcInfo license
Managed through ArcCatalogCreated inside FeatureDataset
Participating FeatureClasses must be
inside same FeatureDataset
• PGDB vs. SDE
Vermont Spatial Data Partnership
July 2006 Roundtable

Setting Cluster Tolerance
•ArcCatalog calculates minimum value as
default
• Minimum dependent on precision of
FeatureDataset spatial reference
• Units are same as the FeatureDataset
• Errors smaller than tolerance are notreported
Vermont Spatial Data Partnership
July 2006 Roundtable

Cluster Tolerance
• Features and their vertices may move!
• Similar to ArcInfo 7.x Fuzzy Tolerance
• ArcGIS Desktop Help,Editing in ArcMap,
Editing Topology, Topology Basics
© ESRI

Vermont Spatial Data Partnership
July 2006 Roundtable

Setting Ranks
• Establishes priority of features that
may shift by ClusterTolerance
• Not relevant for a single featureclass
topology

Vermont Spatial Data Partnership
July 2006 Roundtable

Ranks
• ArcGIS Desktop Help, Editing in ArcMap,
Editing Topology, TopologyBasics
© ESRI

Vermont Spatial Data Partnership
July 2006 Roundtable

Adding Topology Rules
• 26 Rules
– 4 Points
– 12 Lines
– 9 Polygons
– 1 Lines or Polygons
• C:\ProgramFiles\ArcGIS\Documentation\

topology_rules_poster.pdf
• ArcGIS Desktop Help, Editing in ArcMap,
Editing Topology, Topology Rules
Vermont Spatial Data Partnership
July 2006 Roundtable

Validating
• Dirty...