Presented at the 
International Congress of Photogrammetry 
Lausanne, Switzerland 
July, 1968 
  
  
  
an 
ELECTRONIC CORRELATOR 
  
  
  
  
  
  
  
  
  
Tor the 
PLANIMAT 
EEE EE BUND NDA MEE 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
by 
JOHN W. HARDY 
H. RONALD JOHNSTON 
JOHN M. GODFREY 
  
  
Itek ITEK CORPORATION 10 MAGUIRE ROAD, LEXINGTON, MASSACHUSETTS 02173, U.S.A.