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enter image description here

As can be seen in the picture, I've created a Voronoi for points in the UK. However, the Voronoi does not take into consideration the split in land in the south-west region of the country. Therefore, it does accurately display the areas of land nearest to the points. How do I get past this?

I have

  1. UK Boundary vector
  2. point data layer (text converted file, not shp)
  3. Voronoi layer for points
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    Please review these: (1) gis.stackexchange.com/q/294822/29431 / (2) gis.stackexchange.com/q/254593/29431
    – Kadir Şahbaz
    Apr 9, 2021 at 19:55
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    What do you mean by the "split in land"? Is it where you have a voronoi cell that includes parts of southern Wales as well as parts of Devon/Cornwall? If a voronoi tesselation isn't what you want then you have to carefully think about what you do want in terms of contiguity and distances.
    – Spacedman
    Apr 9, 2021 at 19:56
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    @Spacedman I guess, he/she means some points are closer than the actual point when considering the distance in land. i.stack.imgur.com/aWdBf.png
    – Kadir Şahbaz
    Apr 9, 2021 at 20:07
  • @Spacedman you are right, that is what I mean by the split in land. As the voronoi crosses that gap between the southern Wales and Devon, it assumes the point I have in Devon is the shortest distance point from wales compared to the other points. Is voronoi the way to proceed if I am trying to create geographic catchment areas of shortest distance around the points?
    – Vectorbug
    Apr 10, 2021 at 7:25
  • @KadirŞahbaz you diagram explains that well. Thank you. I’ll check the link you attached above!
    – Vectorbug
    Apr 10, 2021 at 7:28

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