Sd = -220.67 + 348.74 x
x = R680 / R711 Source: Dekker A., T. Malthus, and E. Seyhan. 1991. IEEE Trans. Geo. RS. 29(1):89
Source: Dekker A., T. Malthus, and E. Seyhan. 1991. IEEE Trans. Geo. RS. 29(1):89