69 
2-1 
-n square 
3136 3144 
6-5 
157 o 158 
fmewhat 
transfer 
fferences 
at longi- 
3r mined, 
stematic 
are also 
IP ADJUST- 
-EVATION]- 
differences 
meters 
± 16.3 
15.9 
10.9 
17.8 
8.1 
8.1 
8.1 
± 12.8 
263 
0i 234 56789 10 
Fig. 3a: X —Discrpancies /\X Between Adjacent Strips 
If the standard total differences in the last line of Table II are divided by V 2 
the following standard errors for an individual strip in the block are obtained: 
M x = ± 5.6 m, 
M Y = i 7.8 m, 
M H = ± 9.9 m. 
From the true errors at the test points provided by the Presidence of the Group 
of Study for Experimental Researches on Blocks of Strips, International Society 
of Photogrammetry, the standard errors (root mean square errors) M x , M y , and 
M H (M z ) were determined. For this purpose all errors larger than 60 m were elimin 
ated, as suggested by the Presidence, since such errors are obviously blunders and, 
therefore, should not be used to test the accuracy of the block triangulation. 
In performing this error analysis it was found that a typing error of 50 m was 
committed for the F-coordinate of the test point No. 137. Correction of this error 
results in a F-error of AF = —2.6 m instead of AF = —52.6 m as indicated in 
the list of errors prepared by the Presidence. The following standard errors were 
computed with the value AF = —2.6 m. Furthermore, test point No. 207 was 
re-checked and it was found that a wrong point was measured. Therefore, this point