How to mask/trim voronoi polygons around country?

Question

I have mapbox map with ~2000 points and I have voronoi polygons drawn around them vith turf.js, how can set boundaries around country so polygon don't stretch all over the world? I just want to mask/trim them and keep polygons around country borders.

What I already tried is using turf.js mask feature (https://turfjs.org/docs/#mask) but I lose all layers (there are no polygons/points anymore).

Here is my code on JSFiddle:
https://jsfiddle.net/eqxdjv6z/

score 1 · Accepted Answer · answered Nov 11 '19 at 13:30

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Loop through each Border of each Voronoi cell and check if it crosses the outer shell. If so, set the Intersection as a new edge of the Voronoi cell and delete all edges that are outside the meshing area.

Maybe this helps you, as well: https://discourse.mcneel.com/t/trim-voronoi-cell/78408

answered Nov 11 '19 at 13:30

Pixel_95

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Thank you very much! I will look into this :) I thought this was burried in all the questions! – Dominik Nov 12 '19 at 15:06
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hope, it will help you. if so, you can rate my answer up :) – Pixel_95 Nov 12 '19 at 17:58

score 1 · Answer 2 · answered Nov 22 '22 at 17:09

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I see this has been answered, but I had the same issue and I believe there is a cleaner solution. You can simply use the turf/intersect function to clip the voronoi cells to another geometry. No manual border checking or anything.

answered Nov 22 '22 at 17:09

Sam

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How to mask/trim voronoi polygons around country?

2 Answers2