I am trying to split a selected polygon ("regions") with a selected line from another layer ("streets") in QGIS 3.8.3. In the example below, I want to split the selected polygon coloured in yellow with the street pointed at by the blue arrow.

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After reading the post Can't Find the Split selected features with selected line from another layer tool, I realized I can't find it either. I installed the plugin, but the tool seems to be missing from my toolbar:

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  • Try the "Split with lines" tool in the processing toolbox (under "Vector Overlay"). But bear in mind there might be some geometry issues as I think you have a number of dangles in there. – TeddyTedTed Oct 18 '19 at 9:02
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    Perfect. Thank you so much. And you are right, for some polygons I have geometry issues. Do you want to post the answer or prefer I do it, explaining with imagens the how to? – Pescariz Oct 18 '19 at 9:18
  • The Split selected features with selected line from another layer has been removed since the 1.4.0 Version of the digitizing tools plugin (github page of the plugin). – geoSAM Oct 18 '19 at 11:24

In the Processing Toolbox under "Vector Overlay" use the "Split with lines" tool.

Just be wary that with such a complex line dataset this can cause some geometry issues, especially if you have any dangles. If it does then you could try using Fix Geometries or else Validate Geometry to try to fix any issues that pop up.

It might also be helpful to make doubly sure the geometries of both datasets are ok before actually doing the split.

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