International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
   
     
    
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Picture 1. Interface of measurements program 
There is a possibility to attach already measured strips to 
current block that is being measured. Program allows to 
merge different blocks in single network for their joint 
adjustment. 
4. Control operations 
All the technological cycle is saturated by various control 
operations. As far as performed measurements are enough 
for orientation of model, strip or block they are included in 
mathematical processing. Results of control operations are 
shown in a form that is convenient for analysis. 
Special attention in the technology was placed to inner 
orientation process. The quality of fiducial marks’ 
measurement effects on proper restore of projection rays and 
thus, on block adjustment accuracy. DPS software uses 
correlation method for automatic measurements of fiducial 
marks for whole block. Results of automatic measurement are 
controlled by coefficient of correlation and by residuals. Then 
program automatically asks for manual re-measurement of 
doubtful points. 
There are two stages of tie points' accuracy control for 
blunder detection. On the first stage accuracy is controlled by 
parallaxes of calculated relative orientation and residuals for 
654 
tie points placed in triple overlap zone. It is recommended to 
place points in groups by two or more in every standard zone. 
That allows to detect blunders due to increasing of diagonal 
coefficients of matrix. When a blunder point is detected, it 
can be corrected repeatedly. 
On the second stage (usually when strip measurement Is 
finished) full adjustment for all measured strips is performed. 
Photocom on-line bundle adjustment engine is used for this. 
That is further development of well known Photocom-32 
adjustment complex that has been used for years in practical 
photogrammetric production on many Russian and Ukrainian 
enterprises. There three computation algorithms are available: 
checking of block conjunctions, interactive adjustment and 
automatic (batch) adjustment. Adjustment process consists of 
several stages that allows to detect and localize all the block 
defects and blunder points. Rigorous bundle adjustment is 
performed on the final computation stage using co-linearity 
conditions that gives more objective adjustment and control 
in comparison with other methods. A special self-calibration 
algorithm is used to determine the most probable residuals for 
every terrain point. 
Adjustment uses least-squares method with weights assigned 
to all measured values. Minimization is performed by 
multiple solving and selection the best solution using statistic 
criteria. 
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