For the determination of CX> we chose picture 62 of Line 4 as the reference. 
The results are as follows: 
DETERMINATION OF CO 
Line 1 
Line 2 
Line 3 
Line 4 
Reference 
Line 5 
Line 7 
Line 8 
Print No. 
57 
73 
52 
62 
53 
145 
154 
Time* 
16 h 56 m 
17 h 03 m 
18 h 49 m 
18 h 53 m 
22 h 29 m 
20 h 41 m 
20 h 43 m 
From Ground Control 
100 § 18 c 
100 g 15 c 
98 g 95 c 
101 g 00 c 
100 g 15 c 
99 g 17 c 
100 g 07 c 
From Horizon 
100 g 14 c 
Î 
100 g 12 c 
1 
98 g 92 c 
t 
1 
100 g 18 c 
Î 
99 g 18 c 
Î 
100 g 06 c 
t 
*Time shown is Greenwich time 
The arrows indicate the direction of flight. Note that the elapsed time between 
the exposure of the reference picture and the exposure of the measured pictures 
h in 
is as much as 3 n 38 n and yet this time difference did not affect the accuracy of 
the determination of . The accuracy, both in 'p and LO , is remarkably high. 
The maximum difference between the 'p and UJ determined in this way from 
horizon pictures and the values of *p and Uj determined from absolute orienta 
tion on ground control is only 5 C . The mean square errors are: 
m^> = _2 (based on 20 comparisons) 
L- 0 
m<ju = _ 2 (based on 6 comparisons) 
7.2.2 Accuracy of General (j) Derived from Statoscope and Horizon Camera Data 
The inclination of the base was determined from the statoscope data, 
as well as by the procedure described in section 4.3.1 for utilizing the horizon 
camera data. The comparison of these values with the general <^) determined from 
absolute orientation of the stereo models from ground control gives the following 
standard errors of general : 
(a) determined from statoscope 
(b) determined from horizon camera 
■ - 5C 
m£ = Ì2.8 C 
Using the average base distance for the photography of the project, the above 
values are equivalent to an error in elevation of il2.5 feet (^3.9 metres) and 
27