CIVIL ENGINEERING STUDIES 
PHOTOGRAMMETRY SERIES NO. 15 
ON THE PRECISION 
OF STEREOMETRIC SYSTEMS 
By 
H. M. KARARA 
A Report on a Study 
Sponsored by 
THE NATIONAL SCIENCE FOUNDATION 
AN INVITED PAPER OF COMMISSION V 
INTERNATIONAL SOCIETY FOR PHOTOGRAMMETRY 
ELEVENTH INTERNATIONAL CONGRESS OF PHOTOGRAMMETRY 
LAUSANNE, SWITZERLAND 
JULY 1968 
UNIVERSITY OF ILLINOIS 
URBANA, ILLINOIS 
JANUARY 1968