495 
;s can be 
it a on 
.ability 
A. 
1 of the 
of bio- 
755 nm (x<_), 845 nm (x^). Regression equations were calculated, they 
expressed the relationship between the spectral reflectance at any wave 
length and that in 6 selected points. As arguments (y ) were taken spectral 
reflectance coefficients (r^) at the interval of 25 nm, in spectral band of 
400 - 900 nm. These equations may be written symbolically as 
y = a + bx^ + cx 2 + dx^ + ex 4 + fx 5 + gx^ 
)73 in some 
The treatment was made by the computer. Results are given in 
table 1. 
^ion is 
illiqonum 
lla. 
Obtained formulae allow the calculation of a spectral 
reflectance curve on 6 selected points. It has been proved that r can be 
calculated with the accuracy of ± 5% with the probability of 70%. 
of South 
rmed a 
is 
7us 3 Cavex 
mt soil 
Spectral reflectance curves of plants of South Turkmenistan 
are given in Fig. 1. Under these conditions Pistaoia veva is a drought 
resistance species. Its leaves have higher reflectance in comparison with 
desert psammophyte plants. The form of the spectral reflectance curve of 
these plants is analogous to that of mesophytes growing in oases. 
i (an oasis). 
ler objects. 
Results of investigations in the third experimental area are 
presented in Fig. 2. Being compared with the desert area all the plants 
have here higher reflectance in infrared. The maximum in the green band is 
not so distinguishable as by the tree species of the temperate zone (N.G. 
trophoto- 
As a 
sulfate was 
Kharin, 1965). The bright leaf coloration is a characteristic feature of 
plants growing in oases. 
Spectral characteristics of natural objects can be used and 
treated in different ways. As a result spectral reflectance data should 
reflectance 
es in 
lere. 
help solve the main problem - how to increase the information content of the 
aerial photographic image. Let's consider the three ways in solving this 
problem: 1. selecting the proper fil - filter combination, 2. estimating 
the proper season of aerial photography, 3. selecting the most useful 
in the first 
f the whole 
25 nm or 10 
ave lengths 
remote sensor. 
The study of collected data has shown the combination of pan 
chromatic film with minus blue filter is most useful for aerial photography 
of desert lands. Infrared film provides the higher contrast of natural 
aid only be 
e calculated. 
objects in areas of desert zone where cultural objects are common 
(irrigation canals, cotton plantations etc.). This film always gives the 
higher contrast in places where water and soils of different moisture content 
meet. 
ub s ( [Psammophy- 
subccphylla , 
iloxylon 
opulation 
aken at 
nm (x 4 ), 
The use of false color film is not so effective. This film 
provides increased information content only in cultural landscapes, river 
valleys and foot-hills. In our investigations false color film SN - 6 has 
been used. The film represents a modification of SN - 2M film. The emulsion 
speed is one and half times higher than that of SN - 2M and the resolving 
power is higher by 20%. The film allows the estimation of water erosion 
features, salt accumulation places etc.