combination and the resulting image pattern was compared 
  
     
    
   
  
  
  
  
  
  
   
    
    
   
  
  
  
  
  
    
   
  
  
  
  
  
    
with the ground truth map. The results were highly 
satisfactory and the factor combination in the G.E 100 
produced results which were confirmed by the ground truth 
maps. 
The effect of "shadowing" because of terrain form was found 
to be separable from the absorbtion effects from Araucaria 
by stretching the "contrast". Invariably the Araucaria 
areas showed a darker image than the non-Araucaria areas. 
The subsequent use of thirteen computer compatible tapes 
to cover the uhole of the temperate and subtropical forest 
areas was put in hand and applying the same procedure the 
Araucaria forests were identified. As they were confirmed 
on the Television Screen, the image produced was recorded 
on slides and indexed precisely. Subsequently, the slide 
was projected onto a base map and the results traced off 
onto the map, and this permitted the mozaic of slides to 
be built up into a controlled map of the whole area. 
At all times, the results uere checked against any aerial 
photographs and forest survey reports, to ensure that the 
basic methodology was being applied consistently. 
A similar procedure was subsequently applied to mixed 
forests in South Wales using the Plessey IDP 3000. In this 
case the mapping procedure was facilitated by pro jecting the 
slide onto a sand blasted glass screen which permitted work 
to be done without the operator getting into his own light. 
CONCLUSION 
In this paper the general methodology for successfully 
identifying Araucaria and other forests using computer 
technology,has been discussed. This Conference has