Aller au contenu principal

Polygon Features to Split Lines

Overview​

The Polygon Features to Split Lines tool extracts shared boundaries between polygon features. It converts input polygon parcels into line features and automatically labels each generated split line with the polygon feature ID on its left side (Left) and right side (Right). This provides key data support for boundary ownership checks and complex topology analysis.

Use Cases​

  • Cadastre and ownership checks: Extract boundary lines between parcels and automatically label parcel codes on both sides for verification.
  • Administrative boundary analysis: Output county-level or provincial-level administrative boundary lines and identify adjacent administrative area IDs.
  • Topology quality checks: Locate missing or overlapping polygon topology issues by analyzing adjacency labels on split lines.
  • Boundary-level statistics: Use shared boundaries as units for length calculation or thematic map production.

Parameters​

ParameterDescriptionNotes
Input featurePolygon feature dataset whose boundaries will be extracted.Must be polygon features.
Unique identifier fieldID field used to label adjacency relationships.Select an ID, code, or name field.
Output feature datasetOutput collection of generated split lines.Line features contain LEFT_ID and RIGHT_ID.

Steps​

  1. Start the tool: Open the Geoprocessing Toolbox, go to Vector Tools > Feature Conversion, and open the Polygon Features to Split Lines tool pane.
  2. Set input: Select the target polygon layer and specify the unique identifier field used for adjacency labels.
  3. Configure parameters: If needed, configure file format or reprojection options in the advanced settings.
  4. Configure output: Set the output path and file name.
  5. Run the tool: Click Run. The generated split line dataset is loaded automatically.

Notes​

  • Uniqueness requirement: The selected unique identifier field should contain unique values. Duplicate field values can make adjacency labels on split lines logically ambiguous.
  • Outer boundary labels: For split lines on the dataset edge, the label value on one side is displayed as NULL or a specific background ID.
  • Geometry quality: If small gaps or overlaps exist between polygon features, the tool may generate multiple parallel split lines. iXGIS recommends running Align Shared Vertices first and using a consistent coordinate system.