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Photography 
Using this equipment about 20 000 hectares of tropical terrain were 
photographed from a flying altitude above sea-level of between 800— 
2 600 metres. Elevations of the ground were between 4— 850 metres 
above sea-level. Photographs were taken at speeds between 130—200 
km/h. 
Aerial photography was planned also from higher aititude, but this 
turned out to be impossible because of weather conditions. A flying 
height of 2 600 metres means a negativ-scale of about 1:20 800. In this 
scale the signals of 1.4 X 1.4 metres were of good visibility. 
Photography was carried out with Kodak Super XX Aerographic 
film and the rolls were processed during the nights in a provisional 
darkroom. Because of the high temperatures just under the equator, a 
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