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THEORY AND PRINCIPLES OF DESIGN 
OF REALIZABLE PHOTOGRAMMETRIC INSTRUMENTS 
THE 
DERIVING FROM 
POLYNOMIAL EXPANSION OF THE SCALE 
PARAMETER * 
By 
A. M. WASSEF, 
SURVEY OF EGYPT, 
Giza, U.A.R. 
  
ABSTRACT. 
The limitations of stereoplotting instruments based on the represent- 
ation of model errors by simple functions of the photographic coordinates 
are studied in 
the light of investigations into the polynomial representation 
of the scale parameter. It is shown that the limited accuracy of these 
instruments is 
due to shortcomings of the principles of design. 
New principles of design are given. They permit greater precision 
and versatility in height evaluation, contouring, planimetry and profile 
drawing. The maximum error would be in the order of H/10,000 when 
the angle of inclination of the camera axis is 13°, increasing to H/6,000 
when the angle is 3°. 
* This pap 
Congress of Photogrammetry in London. 
er was read on Sep. 12, 1960 at the Ninth International