22 
Ax = a. n + a.x + a 0 y + a o xy + a,x 2 4- a^y 2 4- axy 2 : cr x = 71q 
0 - <- . 3 ^ s I 
Ay = b Q + • jc + 13 2 y + b^xy + b^y 2 4- byxy 2 : a y = 88p 
Az = C Q 4- C-^X 4- C 9 y 4- C^xy 4- C_y 2 4- C^Xy 2 I CT Z = 4l|_l 
The residuals obtained as a result of this adjustment are shown 
in Figure 11. Considering be nature and sources of distortion in 
panoramic materials, these results are quite good and represent a 
significant reduction. Without the Black Box capability such photo 
graphy would be unusable for general topo map compilation class A 
standards - with it a new area of photographic exploitation is opened 
up. 1 
13 Problems Associated with AP-2 
The AP^-2 has several problems associated with it when attempts 
are made to integrate it into an operational organization. They may 
be categorized as follows: 
a. Initial tape preparation 
' b. Environment 
c. Maintenance 
d. Training 
e. Computer integration 
Tape preparation problems are due to the fact that the AP-2 works 
with three different tape formats - two input and one output. The two 
inputs are unique to the computer and not directly translatable from 
standard flexowriter type equipment. The most efficient way of 
handling this problem is to prepare AP-2 tapes by a means of trans 
lation and tape preparation routines on auxiliary computing equipment. 
Special programming to accomplish such preparation has been completed 
at ACIC. 
The need for special environment for the AP-2 needs little 
explanation. This is a precision mensuration device with a great deal 
of electronics associated with it. Temperature and humidity control 
to. within a few degrees and percent points is a must along with power 
free from line fluctuations. Considerable planning and effort had to 
be expended in ACIC for site preparation for the AP-2. 
Associated with the problem of environment are the problems of 
maintenance. Table II is a sample of the down time and maintenance 
accrued with the AP-2 over several months period of time. With 
experience the up time on this equipment is improving but we expect 
always to have a need for maintenance even after it outgrows its 
present prototype stage.