Running the polygonize algorithm from the processing toolbox doesn't seem to work if you have a layer with several line objects that you want to polygonize individually. Think two "polygons-to-be" made of self-intersecting lines that also intersect each other. The algorithm takes the intersection of these two polygons as another polygon, creating three polygons in total although there are only two line objects in the layer. Is there a way to polygonize each object in a layer individually?

  • Looks like the "Lines to polygons" command from the Geometry Tools menu does this. – Felix 4 hours ago

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