Converting Polygons to Lines
The Polygon to Line operation generates a new layer of lines based on a layer of polygons.
Click on PROCESSING → VECTOR PROCESSING → POLYGON TO LINE
Select the input layer.
Optionally, check the option Only selected if you wish to process only the objects that are selected in the map display.
Select one type of
repository by clicking on the
button to save the output layer as a file or on the
button to save it in the database.
Enter the output layer name.
Click on the OK button.