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My task is to generate all data individually to a file that touches each other. I first use overlay_touches(@layer) to get what I need, but I couldn't find a method to identify them into different group.

For example, the following pic would be 5 groups, ideally. Right now I could only think of manually select a group and extract selected features to each ones, which is impractical since the data would contain thousands of it. How do I do it? (Even getting the boundries of each groups is fine, since I could loop the process programmatically by PyQGIS).

enter image description here

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1 Dissolve the layer with advanced parameter keep disjoint feature separate checked.

2 Field calculate the integer field neighborhood as @row_number. Each dissolved separate cluster of polygons will be assigned an individual id.

3 Join the neighborhood attribute to the start layer with "Join attributes by location"

4 "Split vector layer" with neighborhood as unique id field:

enter image description here

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    Exactly what I need, bravo!
    – Cookie
    Jun 2 at 11:52

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