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.
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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 8:48
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I the pic you see the points and a hand drawn boundary. – Pimpel Jul 29 '15 at 8:56
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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.
answered Jul 29 '15 at 8:41
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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:
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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
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