150 



Cniunllan forestry Journal, April, ip20. 



An example of the infinite detail obtainable in Aerial Photo-Tonoc^raDbir 1 

 work-although the picture loses considerable detail in reproducdon the differen 

 varieties of trees and crops can be discerned. In one instLce even the ftfrro " 

 marks m a recently ploughed field are hown. iurro\\ 



To transform a continuous series o these pictures into a correct map of the 

 and dTirerof"fncr°"t-'''''J'°" °^ '\' -^^^"^^^"^ ^' ^^''"^h each picture wL taken 



b^ ,;^.m'"T''' "^°sa.'^/%"ot a true record but an absolutely correct scale map can 

 be made from aerial photographs, giv:n the necessary data and technical skill 

 Ihis method ,s many tnr-es quicker an cheaper than those at present emploved 



