Table 1 
Regressions coefficients for estimating the 
spectral reflectance on 6 selected points 
y 
a 
b 
c 
d 
e 
f 
g 
y 400 
-1,641 
0,815 
0,470 
-0,289 
-0,326 
-0,189 
0,173 
y 425 
1,1003 
0,942 
0,873 
-0,889 
-0,208 
-0,452 
0,314 
y 450 
1,121 
0,917 
1,049 
-1,333 
0,038 
-0,521 
0,387 
y 475 
-2,241 
0,896 
0,966 
-1,465 
0,730 
-0,783 
0,622 
y 500 
4,128 
1,096 
-1,159 
0,695 
-0,609 
0,488 
y 525 
0,500 
0,757 
0,198 
0,498 
-0,337 
0,027 
-0,033 
y 550 
-0,275 
0,729 
0,628 
-0,253 
0,364 
-0,276 
y 575 
0,393 
0,461 
0,609 
-0,732 
0,788 
-0,304 
0,286 
y 600 
-0,563 
0,031 
0.481 
0,574 
-0,180 
0,158 
y 625 
1,694 
-0,302 
0,528 
0,185 
0,735 
0,224 
-0,277 
y 650 
3,757 
0,829 
-0,555 
0,279 
0,377 
0,134 
-0,129 
y 675 
3,529 
1,497 
-0,068 
-0,525 
0,796 
0,109 
-0,221 
y 700 
10,784 
4,011 
-1,959 
1,248 
-0,808 
1,132 
-1,163 
y 725 
17,479 
2,335 
1,451 
-3,901 
1,641 
0,446 
-0,255 
y 750 
8,050 
-1,638 
1,947 
-1,138 
0,657 
0,395 
0,298 
y 775 
8,791 
-2,484 
2,603 
-1,025 
0,497 
-0,333 
0,977 
y 800 
6,860 
-1,116 
1,281 
-0,639 
-0,068 
-0,275 
1,123 
Let’s consider the method of estimating the proper season of 
aerial photography. In the desert the maximal optical contrast between the 
natural objects is observed in spring. So in sandy deserts spring is the 
most suitable season of aerial photography. The beginning and end of this 
period have been estimated on spectral reflectance data and phenology of 
indicator plants.