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I am using QGIS.

I have a map of UK rivers. I want to make a polygon layer of the UK which is split up into segments of the extents of each river. Similar to a river catchment boundary. Each river is its own line in the attribute table.

I've tried to do this with Voronoi polygons. However, it is taking too long.

I essentially want to take this:

enter image description here

And make it like this:

enter image description here

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    The Concave Hull plugin for QGIS may do what you want. You can group the output by the unique identifier for each river. It probably won't be perfect, though.
    – Matt
    Commented Jan 12, 2023 at 9:38
  • does gis.stackexchange.com/questions/6032/… help
    – Ian Turton
    Commented Jan 12, 2023 at 9:44
  • @IanTurton the rivers are not strictly river catchments as some are joined and some are smaller than the data in those datasets. So I'm really looking for a method for this. Thankyou though!
    – Melanie Baker
    Commented Jan 12, 2023 at 9:47
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    Is the river dataset open data? Can you share a link to it? That way the collective swarm intelligence could go at it like beavers at a birch tree (sorry...) and try it out.
    – til_b
    Commented Feb 17, 2023 at 16:06
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    @til_b Yes.. beta.ordnancesurvey.co.uk/products/os-open-rivers
    – Melanie Baker
    Commented Feb 21, 2023 at 11:04

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