Which transformer can I use to identify overlapping polygons in a single dataset and show them as the output.
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You can use the AreaOnAreaOverlayer.
You could try the AreaOnAreaOverlayer and then a TestFilter to separate out the features that you want afterwards.
https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/areaonareaoverlayer.htm
You can use the AreaOnAreaOverlayer.
Whoops sorry, your post had not loaded when I typed mine, did not mean to double up the answer.