15 
b2) The lens distortion routine could be improved by a more 
appropirate formulation permitting asymmetry and 
tangential components, 
b3) refraction could be considered also for x and y values, 
bV) ¿i routine could be included to correct constant spindle 
errors detected by a calibration of the instrument, 
b5) the procedure for absolute orientation could be written 
as a strict solution; or even better, 
b6) a model orientation procedure could be provided to 
include relative and absolute or even interior orientation. 
c) Tmp rovem ent.of O perator Eas e 
The present operation of the analytical plotter is panel 
oriented. But another device, which has not been made use 
of effectively the computer-typewriter, 
cl) While the push button operations are very convenient for 
displaying coordinates and constants their recording is more 
efficiently done on the typewriter. 
c2) Likewise more efficient is the introduction of new coordinates 
or constants to the AP/C through the typewriter. The present 
dial settings are rather awkward for a fast operation, 
3.3 Bendix Research Facility Software i 
Some of the mentioned software improvements have already been 
implemented on the Bendix Research Facility utilizing a cathode 
ray tube terminal, 
1. There are several versions for interior orientation, 
2. There is one exterior orientation program 
3. The facility has been programmed in a modular structure 
Under the command section it selects operating modes such as 
data loading ' 
interior orientation 
point visiting for measurements