114 
CONCLUSION 
The objectives of this research were to economically 
produce color orthophotoquads from the original CIR 
and achieve matching tonal quality and density values 
between adjacent quadrangles. To do so required 
following a systematic approach such as the PDCS in 
exposing and processing large blocks of orthophotoquads. 
Generally these conditions were met. This system will 
improve production methods and standards for preparing 
color separations on all future orthophoto projects. 
REFERENCES 
Brumm, M. and Waters, <J., 1977, Photodensity Control 
System for Orthophoto Products: Photogrammetric 
Engineering and Remote Sensing, Vol. 43, No. 9, 
p. 1177-1182. 
Clark, C., Gwyn, A., and Jurado, A., and others, 
1971, Orthophoto Workshop: Falls Church, Va., 20 p.