Repair Polygon Geometries

The Repair Polygon Geometries algorithm reconstructs invalid, self-intersecting, or wrong-type polygon geometries and recovers null/empty polygon shapes into a clean vector output layer.

Access

• Processing Toolbox: GMD Pipeline → GMD Toolkits → Repair Polygon Geometries
• Algorithm ID: gmd_pipeline:repairpolygongeometries

When to Use

Use this algorithm when:

• Reconstructing invalid GEOS geometries or self-intersecting polygon boundaries.
• Recovering missing/null polygon shapes using surrounding boundary context.
• Running automated repairs on specific features identified during Scan Geometry Errors.

Parameters

Parameter	Type	Description
Input Polygon Layer	Vector (Polygon)	Target vector polygon layer to repair. Supports native QGIS Selected features only option.
Repair Mode	Enum	• Auto-Detect & Repair All Issues • Reconstruct Invalid / Self-Intersecting / Wrong-Type Geometries Only • Recover Null / Empty Geometries Only
Repaired Polygon Layer	Vector Sink (Polygon)	Output vector polygon layer containing clean repaired geometries.

Selected Features Execution

This algorithm natively supports QGIS's Selected features only checkbox:

1. Run Scan Geometry Errors to identify problem features.
2. Select target features on the input polygon layer (using feature selection or matching source_fid from the error layer).
3. Open Repair Polygon Geometries, tick Selected features only, and execute the algorithm to repair only those selected features.

Non-Destructive Memory Layers

All output features are written to a new Repaired Polygon Layer (or file destination). Your original source dataset is never modified during processing.