In the shi dozier snow wetness model, I have used band math in SNAP to get the parameters required like DT, DTH, DTV, and DRS. For example, DTH


In the above case, first, I calibrated the image to sigma_ vv and sigma_ hh, then using band math got"sigma_ vvhh"(as sigma_vv*sigma_hh), afterwards"sigma_vvhh / sigma_hh" to get DTH. Is this approach correct?

Or I have to use Re[Tvvhh…, if yes, how can I get Tvvhh(θi, Es)^2

θ i = local incidence angle

Es = dielcetric constant