where T-^, T^ - are radio-brightness temperatures, respec 
tively, registered over the land and water 
surface concealed under the vegetation 
layer ; 
p - is the radiation of power of vegetation. 
The threshold value aT ^ corresponding to the pres 
ence or absence of the boundary “land—water” is selected 
depending on the required probability of correct identifi 
cation and (or) false alarm in accordance with the select 
ed statistical criterion. 
More convenient is the use of the radiation power. In 
such a case 
A d€„ =Xp(A,Q)-X B (S,A.T]-'X(A,Q)-(t-9€ is (S,}l,T)) ( 2 ) 
where ££& - is the radiation power of water Adfn = aTs/t ; 
Q - is the conventional vector of parameters of ve 
getation layer; 
5 - is the salinity of water. 
From (2) it follows that the basic parameter govern 
ing the possibility of detecting the boundaries is the in 
tegral absorption of radio-thermal radiation in the vege 
tation layer 
2€p (A ,Q) - Attn - &€ e (S t A , T) 
4 ~ (S.JL,T) 
Expression (3) contains variables Ji , Q , S , T . Note 
that the functions &(T) and d€ & (S) in most case can be 
ignored. If it is necessary to assess the wavelength band 
optimum for solving concrete problem, then from (3), using 
for instance the relationships at (A 9 g^ similar to the re 
sults of publication [l],those wavelengths can be found at 
which with the maximum contents of biomass per unit area g 
the probability of correct detection shall be sufficiently 
high. 
It should be noted that in case of polarization mea 
surements, in equation (3) the corresponding parameters 
shall be referred to the concrete polarization. In case of 
concurrent use of measurements at several polarizations 
(or wavelengths) the equation of type (3) shall form the 
system of equations each of which is related to one pola