I am using Sentinel-1 SAR GRD imagery with IW and EW swaths from ESA through Google Earth Engine.
Is the pre-processed Sentinel-1 GRD product that I access through GEE is Sigma0 or Gamma0 or Beta0?
Also how can I convert from Sigma0 to Gamma0?
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sigma0 = beta0 * sin(theta) ... where beta0 is the square of raw digital number
gamma0 = beta0 * tan(theta)
gamma0 = sigma0/cos(theta)
You can implement the above expression in Earth Engine to obtain gamma0.