Convert reflectivity to reflectivity factor
eta_to_dbz(eta, wavelength, K = 0.93)reflectivity in cm^2/km^3
radar wavelength in cm
norm of the complex refractive index of water
reflectivity factor in dBZ
# reflectivity factor (dBZ) at C-band for a reflectivity eta=10000 cm^2/km^3:
eta_to_dbz(10000, 5)
#> [1] 13.73165
# reflectivity factor (dBZ) at S-band for a reflectivity eta=10000 cm^2/km^3:
eta_to_dbz(10000, 10)
#> [1] 25.77285
# expected reflectivity factor (dBZ) for an
# animal density of 1000 individuals/km^3
# and a radar cross section of 11 cm^2 per individual:
# at C-band and S-band:
eta_to_dbz(1000 * 11, 5) # C-band
#> [1] 14.14557
eta_to_dbz(1000 * 11, 10) # S-band
#> [1] 26.18677