Boundary from Points

Question

I have a point cloud and need to process a very detailed boundary around the outer points. Is there a tool in QGIS? Convex hull is not detailed enough.

What do you mean by 'detailed enough'? Could you edit your post to share a sketch/diagram of what you are looking for? Also see this question. — Simbamangu, Jul 29 '15 at 08:48

Simbamangu · Answer 1 · 2015-07-29T18:00:13.900

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In QGIS, many of the really good tools are in the processing toolbox; you need 'concave hull':

Try it with different threshold values for different levels of detail:

Finally, add a 10% buffer around the outside to make it resemble the sketch you provided:

edited Jul 29 '15 at 18:00

answered Jul 29 '15 at 09:49

Simbamangu

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And then buffer the result to get the boundary line to look more like the OP's illustration. – user23715 Jul 29 '15 at 17:00
Good point, could make it match perfectly! – Simbamangu Jul 29 '15 at 17:25

score 11 · Accepted Answer · edited Apr 13 '17 at 12:33

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Try Concave hull, What are Definition, Algorithms and Practical Solutions for Concave Hull?

Concave hull has a smaller area, and most of implementations allows you to tune how small and precise resulting polygon should be.

edited Apr 13 '17 at 12:33

Community

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answered Jul 29 '15 at 08:41

dmitry.v.kiselev

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Boundary from Points

2 Answers2