67 
After substitution of the weight- and correlation numbers from (174)— 
(181) and some rearrangements we find 
29 
di 72 9 ç 
Bos TE 9 (n di 2) (270) 
According to HALLERT 1957 the influence of the errors of the first 
model can be expressed as the weight number 
0’ 13 a2 13 x 13 
= A e am 
eu gg 65 1 6 (271) 
For x — bn we find 
: 13 
Qu 6 (n? cu» "tr 1) (272) 
After adding (272) and (270) we finally find 
] 
«yy s 18 
(4 »? 4- 39 »? — 31 » 4- 39) 
p 
bo 
-T 
qu 
o2 
— 
n^n" 
The standard error of the y-coordinates along the center line of the 
open aerial triangulation strip is finally found as 
m, = 8 ] Qu v, (274) 
S 
i, ls the standard error of the y-parallax measurements. 
For points along the edges of the strip the expressions (241) or (243) 
can be applied. 
After substituting the expressions (211), (213) and (214) into (241) 
and some rearrangements we find 
i-—n i=n i=n 
Dy, — b XN (n —à I) dx; 4- X dby; — h X do; (275) 
i=1 i-1 i=1 
Evidently the difference between this expression and the expression 
(265) can be neglected. 
The influence of the errors of the first model upon the points along 
the edges of the strip is a little different from the corresponding influence 
upon the points along the center line of the strip. According to HALLERT 
uL 
DE 
Eel 
m 
  
  
TEE 
ELE 
| 
b 
| 
| 
IE 
EZ SER