I created a hexagonal grid using MMQGIS for my project and after some selection, I ended up with several clusters of units (as can be seen in the picture). I define as a cluster all the small hexagonal units that are connected.

What I wanted now is to convert these clusters into polygons so I can calculate the area of each polygon after. How can I do so?

QGIS version: 2.18.17 Workspace

  1. Dissolve (Vector - Geoproccessing - Dissolve)
  2. Multipart to Singlepart (Vector - Geometry Tools (?) - Multipart to Singlepart)
  3. Calculate an area column, see: Calculating polygon areas in QGIS?

enter image description here

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    This is precisely what I wanted! Thank you for your detailed answer! – Ricardo Simões May 3 '18 at 11:03

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