International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
  
  
  
  
   
   
  
   
  
    
    
    
    
   
   
     
    
    
    
    
  
    
   
  
    
    
      
    
  
    
   
   
  
  
The simultaneous recording of location and intensity of first 
and last pulse can offer the possibility to improve reliability of 
filtering, also for forest areas. Different surfaces reflect pulses 
differently and therefore it may be possible to use this 
information in classification. As far as the reflection-intensity 
value is concerned only the points of the values greater than 
190 relative units can be qualified, with a high probability, as 
the earth. 
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