33 
applying techniques essentially free of propagation effects, 
or the determination of night-time cloud coverage by corre 
lating the number and frequency of successful observations 
at specific stations with the theoretical observational 
possibilities obtained from orbital prediction programs. 
Of interest not only to the geodesist, but equally to the 
astronomer, should be the fact that at the conclusion of the 
world program it is expected that about 2^0,000 pairs of 
residuals in right ascension and declination will be avail 
able from an anticipated 2^00 single camera reductions. 
Because only about 12,500 cataloged reference stars are 
included, there will be available for each of these stars 
an average of twenty pairs of residuals. Their individual 
average values should indicate the quality of the presently 
cataloged data and, for these stars, collectively contribute 
to the establishment of a catalog for a more recent epoch. 
Such an undertaking--if successful--would help to increase 
the accuracy of future satellite densification triangulations 
contemplated to follow the World Net Program. 
In conclusion: results obtained by photogrammetric 
satellite triangulation prove the photogrammetric method to 
be capable of providing consistently high precision in all 
of its individual operations. As a system the method pro 
vides the necessary accuracy to establish a worldwide geo 
detic reference frame approaching one part in one million. 
To the extent that the results of the individual steps in 
the data reduction have been statistically analyzed, it has 
been proven that the analytical treatment of photographic 
raw data enables the photogrammetric measuring method to 
obtain its final results with an accuracy consistent with 
theoretical expectations. 
Therefore, it is concluded that the application of the 
satellite triangulation method to the establishment of geo 
detic densification nets on continental land masses provides 
a sound approach for establishing a frame of control in 
support of the adjustment of extended first-order triangu 
lation networks. 
For the application of the method of aerial triangulation 
to the establishment of lower-order geodetic control the 
results indicate that the photogrammetric method should be 
capable of producing, depending somewhat on the focal length 
of the cameras used, triangulation results of one part in 
fifty thousand to one part in 100,000 of the flying height, 
subject to the postulation that neither systematic refraction 
anomalies nor scintillation effects impair unduly the geometric 
significance of the photographically-recorded directions.