15. 
m. TEST RESULTS 
The aerotriangulation procedure was programmed in FORTRAN 62 for use 
on the Cornell University Computing Center CDC l6o4 Computer. The complete 
procedure can he performed in a single computer run or may he run using any 
combination of the previously mentioned major steps. 
Tests were performed with three major classes of data: (a) theoretically 
correct fictitious data; (*) fictitious data in which randomly distributed 
displacements were applied to plate coordinates; and (c) actual photographic 
data. 
A. TESTS WITH THEORETICALLY CORRECT FICTITIOUS DATA 
7 
Tests were run with the Church fictitious photographs 1-12 and with 
Q 
the USGS fictitious North - South strip of photos 0-7* Both sets of data 
have IQfjo relief and are at scales of 1:^0,000 and 1:8000 respectively. These 
tests were performed to verify the formulation of the method and computational 
accuracy of the computer program. Ground control and pass point configurations 
are illustrated in Figure 3*01 and discrepancies between fictitious and 
calculated values are given in Table 3*01 for test cases 1 - k. These 
discrepancies compare favorably with results obtained with the same data 
9 10 
using other theoretically accurate methods 9 . As a result of these tests 
it was concluded that the equations were correct and the computational accuracy 
of the computer program was adequate. 
B. TESTS WITH FICTITIOUS DATA CONTAINING RANDOM ERRORS 
Tests with theoretically accurate data do not provide an indication 
as to how the procedure will behave when random measuring errors occur. To 
verify the least squares adjustment under conditions when such errors are 
present, randomly distributed displacements were applied to the fictitious 
plate coordinates and tests were performed with these data. Two sets of