24 
AVERAGE 27 STEREO-MODELS 
LINE 8 
LINE 7 
LINE 6 
LINE 5 
LINE 4 
LINE 3 
LINE 2 
LINE 
LOCATION OF VERTICAL CONTROL USED FOR EVALUATION OF ACCURACY 
Fig. 19 
Portion of a Project Area in Canada where 
Vertical Control was Available for Evaluation 
of the Accuracy of the Mapping System 
7.2.1 Accuracy of and Determined from Horizon Camera 
A total of 28 stereo models was oriented absolutely in the B-8 
plotter using ground elevations or water bodies. The tip and tilt of the left 
and right photographs were read using the L-shaped bubbles, giving absolute 
values for S’ and for each picture. These values were then compared with 
the values of 'p* and LP derived from horizon pictures. The results based on 
56 comparisons are as follows: 
«LŸ 
dU2 
o c 
- 
+2 C 
77 
0 C 
- 
1"2 C 
56 
+ 2 C 
- 
+3C 
11 
+ 2 C 
- 
Î3 C 
14 
Ì3 C 
- 
Ì4 C 
5 
Î3 C 
- 
Î4 C 
7 
Î4 C 
- 
Î5 C 
7 
Î4 C 
- 
Î7 C 
23 
in square 
errors 
of and UP 
are as follows: 
rm 
Ï2?2 
+ 0 C.r 
m <jj = -3. fc>