n a 
no 
If the coordinate fit is satisfactory the strip is continued by bridging over 
the following models until new control points are available. Then the 
transformation is applied again. This time all the control points previously 
chosen are automatically available and the operator identifies only new 
control points to run another transformation of his choice. When a gross 
discrepancy is discovered an identification error is the most likely cause. 
If the suspected point happens to be in the current model the remeasurement 
is easy. The program is set in a way that one can combine coordinates 
retrieved from model banks with model coordinates directly measured in the 
current, physically still available model. If mode switch M4 is engaged (see 
Appendix A-4) the real-time positioning routine RTP/A starts its indefinite 
cycle interrupted only by action switches Al or A4 to either record the 
measured model coordinates or to terminate the cycle, respectively. 
Computations are then rerun and the old model point eventually deleted. In 
case the suspected control point is located in some of the preceding models, 
the bridging of the strip is temporarily suspended. The faulty model must be 
reset from data banks in a procedure described in the following section, and 
the control point in question checked. After the point is checked or 
remeasured, the operator can either continue from this model on and repeat 
the remaining part of the strip, or return to the last model, reset it and 
continue from there with a minimum loss of time. 
Model Restoration and Reset 
The first section of the flowchart in Appendix A-1 indicates the initial 
conversation in which the operator decides on the type of operation by 
properly defining the RESET attribute which then controls some of the 
subsequent functions. 
Restoration of the Last Model. In any production environment it is often 
necessary to suspend the operation temporarily and continue later with no 
loss of data and without the need to repeat any of the measurements. The 
photographs must remain in their stages during the interruption and the 
measuring mark must be set on a well defined optical detail or its position 
secured by disabling the manual control elements. Then it is only necessary 
to store all needed information in an auxiliary file for later restoration of 
the model. Information needed for this purpose includes the contents of all 
Anaplot registers, all working variables and arrays representing the 
conditions of the current work or its status at the time of interruption and 
all orientation parameters. The generated storage file is disk resident and 
its contents can later be read back to the memory or transferred to Anaplot 
registers as needed to establish the identical physical and numerical 
situation frozen at interruption time. 
Reset of an Old Model. Another situation arises when there is a need to go 
back and reset a stereomodel from photographs which were already physically 
removed from Anaplot photo stages. This is usually done for the purpose of 
checking measurements of a control point suspected of a misidentification. 
In this instance, it is necessary to use the data banks so far collected 
during the preceding triangulation operations. A special resetting program 
searches through available data files for given photo numbers and retrieves 
previously recorded information important for the reset. Additional 
information on conditions of the original solution is reentered manually from 
the computer terminal. A new inner orientation of both photographs involved 
represents the only measurement procedure needed in the reset. The new set 
of measured fiducial coordinates is fitted with the corresponding set of 
previously recorded and retrieved coordinates by affine or bilinear