175007 
Thailand/Miller, Nualchawee and Tom 
  
  
  
  
  
  
  
  
  
(a) 1954 forest types (b) 1966 forest types 
  
  
  
  
  
  
  
  
  
   
  
  
  
  
  
  
  
or 5 (c) 1968 forest types (d) 1972 forest types 
versary 
)ates 
| Date 
Only FIGURE 7.2 FOREST COVER DATA PLANES ILLUSTRATING THE MARKED INCREASE IN CYCLE 
TIME IN THE TRANSITION OF FOREST COVER TO SHIFTING CULTIVATION. Each display em- 
phasizes the areas of shifting cultivation in black. All 4 of these cover type maps were compiled for 9 
cover types by very careful, detailed interpretation of low-altitude, black-and-white airphotos.