Conversion to dB

Can somebody please tell me the basic purpose of conversion to dB function. I am very new to SAR.
Thanks in advance.

Conversion to tB transforms data into the log scale. It is not mandatory, but helps visual interpretation and also statistical evaluation, because the histogram gets a Gaussian distribution.
An example is given here: Classification Sentinel-1 problems with MaxVer

More information here: (page 35)

So it depends on your application if it makes sense to convert to dB or not.

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