ELEVENTH CONGRESS OF THE INTERNATIONAL SOCIETY 
OF PHOTOGRAMMETRY 
LAUSANNE 1968 
PAPER PRESENTED TO COMMISSION IV 
REMARKS ON PLANNING AND EXECUTION 
OF MAPPING PROJECTS IN TROPICAL AREAS 
by 
Dr. J. M. Zarzycki, P. Eng., 
Executive Vice President. 
TERRA SURVEYS LIMITED, 
Ottawa — Canada.