110 



Canadian Forestry Journal, March, 19J9 



An indication of wliat the aeroplane camera migiit do in mapping tlie forests of Canada. 

 Tliere i.s a lamentable lack of forest maps in the Dominion. Some aviators claim they can dis- 

 tinguish tree species by examining stereoscopic photographs and by other methods. This, of 

 course, would be only of general value and the ground cruise would always be necessary. Note 

 the remarkable boldness of outline at 15,000 feet. (A photograph taken on the French front.) 



PHOTOGRAPHING FORESTS FROM THE AIR 



B^ Lieut. Lewis, R. A. F. 



Use of Stereoscope in Reading Results — Dis- 

 covering Burned-Over Areas. — Can 

 Species be Identified? 



So far as I know, air photographs have not 

 been used up to the present, for other than war 

 work, and my experience with them has been 

 entirely in that sphere. Such marvellous results 

 were obtained from them during the course of 

 the war, particularly during the latter part, when 

 planes, cameras and operators were more ef- 

 ficient and ground interpreters became more 

 familiar with their work, that I think it is the 

 duty of those of us. who became experienced in 



their use, to pass that experience on to those in 

 commercial life, who are most likely to find it 

 of value. The timber industry seems to me to 

 be one in which their use has great possibilities. 



Interpreting Photographs. 



For about a year of my stay in France, I was 

 employed in the Intelligence Department, and 

 among my duties was the interpretation of aerial 

 photographs and the transferring of information 

 thus gained, to our maps. Of course we already 



