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
