I have been using the Concave Hull plugin in QGIS & the Shared Nearest Neighbor Clustering feature.

I am having issues with this plugin, each time I choose the option of "Number of Neighbours" it doesn't seem to work.

This is the same issue DrottTom explains in his post here,

Grouping points in QGIS?

  • As a workaround, you could make the point clusters first, using one of several clustering tool in the processing toolbox. Then create concave hulls using the concave hulls (k-nearest neighbor) algorithm, which allows you to specify a grouping field. – csk Jun 21 '19 at 20:37

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