Can someone tell me the preprocessing steps for Entropy-alpha decomposition of sentinel-1 dual pol SLC data?

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I brought you some answers from the help of SNAP and from the STEP FORUM,

First take a look at the In H-A-Alpha decomposition calculations,

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Second the eigenvalues of coherency plying an important role of the result,

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most of the decompositions require 4 polarizations: HH, HV, VH and VV.

However, most of the Sentinel-1 data in IW mode is in only one or two polarizations:

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