that by having such observations in the areas where the intersection of rays 
is geometrically weak, we can improve significantly the detection of gross 
  
errors and the external reliability of blocks containing systematic errors. 
: #. c 
References 
ZZ raj 
El-Hakim, S.F. (198la), "An Evaluation of the Different Criteria to Express 
Photogrammetric Accuracy”, Proceedings of ASP fall Technical meeting, San 
francisco, Sept. 9-11, pp. 292-298. : . 
  
  
  
Ei-Hakim, S.F..(1981b), "A Practical Study of Gross-Error Detection in : 
Bundle Adjustment", The Canadian Surveyor, Vol. 35, December, 1 
pP. 373-386. t 
El-Hakim, S.F. and W. Faig (1981), "A Combined Adjustment of Geodetic and ; 
Photogrammetric Observations", Photogrammetric Enginnering and Remote 1 
Sensing, Vol. 47," No. 1, January, pps 93-99. 2. 
Kenefick, J.F., et al. (1978), "Bridging with Independent Horizontal 3 
Control", Photogrammetric Engineering and Remote Sensing, Vol. 44, 
No. 6, June, pp. 668—695. 
Wong, K. and G. Elphingstone (1971), "Aerotriangulation by SAPGO", 
Photogrammetric Engineering, Vol. 38, No. 8. 
  
Si 
C!