QGIS – Converting Cluster of Points to Polygons

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I have an input point layer that is grouped into clusters, so I want to have each cluster of points converted into polygon.

This question How to convert a set of points to a polygon based on a specific field in QGIS (this question was removed) seems to come close to what I wanted by it hasn't been answered.

So basically, I need an algorithm in QGIS that will convert each cluster of points (based on attribute field) as seen below into a polygons?

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I have tried "Point2One" plugin and it gave me wrong result seen below…

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A copy of my data is found here.

Best Answer

Convex hull - as mentioned by Kazuhito - is one option, but - depending on the cluster shape - you will get more appropriate polygons using concave hulls, for example implemented in ConcaveHull plugin.

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