By S. V. Viktorov, Ye. A. Vostokova, D. D. Vyshivkin, R. C. Rollins and G. Taylor (Auth.)
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A n d r e y e v ( 1 9 4 0 ) recommends that n o t m o r e than 1 0 per cent o f the flying time planned f o r the w h o l e s u r v e y should be spent on reconnais sance transects. A f t e r the reconnaissance flights, s u r v e y w o r k in the n a r r o w sense o f the w o r d takes place. W h e n the s u r v e y o r sets out on a transect, he must prepare the aeroplanshetka and the map of the flight, possess a field journal and p h o t o j o u r n a l , and check the condition of his w o r k i n g * It should be noted that Andreyev (1940) includes flights over étalons among re connaissance flights.
Naturally this type o f s u r v e y presupposes the existence o f aerial photographs o f the entire t e r r i t o r y t o be surveyed. T h e i r scale may v a r y : the largest scale o f contact prints is n o t required here, as a s u r v e y f r o m an aeroplane, because o f its t e m p o (due to the speed o f the a e r o plane) makes it impossible f o r the s u r v e y o r t o dwell u p o n the smallest details o f the plant c o v e r . In the practice o f geo-botanical a e r o - v a l u a tion w o r k prints on a scale o f 1 : 5 0 , 0 0 0 are widely used.
If the area under study in w h i c h linear valuation is made is almost a square o r a rectangle, the valuation paths are better laid out either perpendicular t o the sides o f the area o r along the t w o diagonals. * T h e best method o f calculation, in K u n i t s y n ' s opinion, is t o use f o u r p a t h s — t w o diagonal and t w o perpendicular t o the sides o f the area. In that case the average v a l u e obtained f r o m all f o u r paths is v e r y close t o the true ratio o f the c o m munities obtained b y means o f a continuous outline s u r v e y o f the area and calculation o f the respective areas w i t h a planimeter.