18 
In this test a grid model was formed to simulate a frame photo 
graph model. The coordinates of each grid intersection were analyti 
cally deformed using a set of non-conformal third degree polynominal 
distortion equations in X, Y and Z. The coefficients of these poly 
nominal equations were fed as constant data into the Black Box 
Program and the instrument deformed model, was compared to the analyti 
cal deformed model. Figure 8 shows the magnitude of deformed data 
used in this test. As you can see, large distortions were introduced. 
Figure 9 shows the residual model distortions remaining after the 
Black Box adjustment of the model to the theoretical distorted values. 
The unit standard error of residuals after adjustment was: 
a x = 11.9b 
= 11.5m- 
a z = 23.0m- 
12.2 Black Box Adjustment of Panoramic Materials 
The computational precision test proved the capability of the 
AP-2 to compensate for extreme non-linear distortions. An interesting 
application of this capability was to remove the distortions from a 
stereo model constructed using stereo pan materials taken at a 
comparatively high altitude over Shaw AFB, Alabama, The camera employed 
for these tests was the KA 52 panoramic system having the following 
characteristics : 
f 
Scan angle 
Format 
Cycling ratio 
Resolution 
= 75 mm 
= l8o° 
= 4 l/2" x 12" 
= 6 cycles/sec. 
=70 lines/mm 
Two exposures having common overlap and a convergent angle of 
30 0 were selected over a well mapped area in the vicinity of Shaw AFB. 
After setting up a 2x enlarged portion of the stereo pan model in 
the AP-2 and orienting it absolutely to map control, the residuals 
shown in Figure 10 at model scale were obtained. Several adjustments 
were made to determine the best set of coefficients for the Black Box 
Program. The final set of non-conformal equations selected were of 
the form: