central Mali, these areas are linked to the annual growth of natural vegetation. This growth is different to the 
south, in the middle and to the north of the delta. The fight against locusts in this region can thus be efficient 
only if it is based on a good map of vegetation growth stages. After a survey mission on the spot in 1970, FAO 
decided to compile such a map on a 1:50,000 scale by the photointerpretation of a double aerial coverage 
(panchromatic black and white infrared) taken at different times and taking propagation and decrease into 
consideration. The period chosen was from January to March, 1971, and the survey was made from south to 
north of the delta. This paper describes the main features of the map and presents a fragment. 
22.  Maruyasu, T. 
Nakamura, H. 
Fuchimoto, M. 
Japan 
EXISTING AERIAL PHOTOS FOR LAND USE ANALYSIS 
Abstract not provided. 
23.  Maruyasu, T. 
Murai, S. 
Japan 
TOPOGRAPHIC INFORMATION PROCESSING 
SYSTEM IN CIVIL ENGINEERING 
Abstract not provided. 
24. McEwen, R.B. 
United States 
IS REMOTE SENSING OPERATIONAL? 
Abstract not provided. 
25. Mike, S. 
Hungary 
THE FUNCTION OF THE AERIAL PHOTOGRAPH IN THE LARGE 
SCALE SOIL MAPPING 
The growing needs make the regional survey more intensive for the exploration of the biological resources and 
the continuous control of them. This is necessary in the developing, and in the undeveloped countries alike, 
even then when they possess considerable survey results. 
The soil survey is an important part of the regional exploration. Some authors state that aerial photographs 
are only applied to the medium and small scale soil mapping adequately, since the photographic interpretation 
cannot fulfill the requirements of the large scale soil survey, because the necessary details cannot be seen on 
the aerial photographs. Should things be so, and the aerial photographic interpretation is useful only at small 
and medium scales, which fulfills the developing nation’s requirements only, it cannot be considered as a 
method of universal validity. 
The researches accomplished within the frame of the experimental program of soil survey and classification 
of our country, demonstrated that the aerial photographic interpretation is suitable for the large scale soil 
survey. We were carrying out parallel land surveys on a different landscape of our country, partly applying the 
aerial photo interpretation method, partly the field survey. The result has given the proof, that by the 
application of the system of complex land analysis, depending on the nature of slopes, on the geomorphologic 
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