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utilized when studying the ice cover in arctic regions of our 
country in relation to the navigation possibility as well as car- 
rying out geological investigations (7). 
The system provides small scale images (1:100 000 and 
1:200 000),similar to small scale aerial photographs, which may 
be taken in any weather and at any time what makes the radar air- 
borne survey, taking into account the flight speed of AN-24 air- 
craft, extremely rapid and efficient for deriving information. 
Due to low radiation angles, radar images exhibit the surface 
topography most clearly providing sculptural pattern. 
The radar aircraft survey is broadly applied to geological in- 
vestigations due to, first of all, its all-weather applicability, 
the possibility of the rapid obtaining of small scale images of 
vast areas (tens thousand of sq. km) as well as the presentation 
of most important geological structure indicators, i.e. relief, hy- 
drography, surface texture, its moisture, vegetation and soil cover 
etc., which are based upon when interpreting aerial photographs. 
The radar survey is most effectively applied in the North where it 
is difficult, or sometimes impossible, to get other-type informa- 
tion. However, radar images are also applied in southern regions 
alongside with traditional aerial photographs, because they frequen- 
tly contain new geological information due to the utilization of 
centimeter wavelengths, the 'sculptural' character of the image, 
natural generalization of objects, susceptibility to the moisture 
variability and slightest unevenness of topography etc. Their ap- 
plication is in line with the existing tendency to carry out geo- 
logical investigations on the basis of the principle 'from general 
to particular! due to the greater availability of information deri- 
ved by remote sensing techniques using both aircrafts and space ve- 
hicles. The acquisition of space photographic images has supportad 
the tendency. However, the radar survey has become indispensable 
for the rapid obtaining of information over large territories and 
in areas predominantly covered by thick clouds. 
Nowadays, an areal radar survey method has been elaborated 
which provides information necessary for the economic development 
of the country and scientific research. A new technique of the 
geological interpretation of radar images has also been worked out 
aimed at the study of the structural-tectonic pattern, mineral 
composition of rocks, geomorphology etc. 
Currently, many geological organizations of our country broad- 
ly apply radar imagery to the geological mapping.Though the impor- 
tance of the radar technique in the process of integrated aerogeo- 
logical investigations may be different and depends on the problem 
to be solved, its application in the course of regional geological 
investigations and mineral exploration helps substantially reduce 
the amount of spent time and improve the quality of geological map- 
ping as well as make the mineral prediction and exploration more 
reliable. 
The further improvement of the radar imagery geological inter- 
pretation is related to the qualitative modelling of reflecting 
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