Sentinel-1A Flood mapping

https://youtu.be/derOXkPCH80 Can anyone explain is this a classification or not. what is the name of the classification?

It is not a classification because the pixels are not grouped into distinct classes.
The tutorial rather presents a nice way of visualization or enhanced image interpretation based on an RGB composite through additive color mixing.

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Thanks for the reply, sir. From the output of RGB composite(image) we can do classification on SNAP?

no, the RGB is just a form of visualization.

You can map floods based on thresholding or supervised and unsupervised classification.

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