Non-Destructive Line Reversal ¶

The author describes a non-destructive approach to reversing line directions in QGIS without altering underlying data. Rather than using the swap vector direction plugin or PostgreSQL’s ST_reverse function, they demonstrate using the geometry generator feature.

Key Steps ¶

• Access the style tab within layer properties
• Convert symbol layer type from Simple Line to Geometry Generator
• Set geometry type to LineString/MultiLineString
• Input the expression reverse( $geometry ) to reverse feature geometry
• Switch to Marker line symbology for customized visualization
• Apply changes to display reversed lines on the map canvas

The post includes before-and-after visual comparisons showing original and reversed road layer directions.