The central photograph, number 1846, at scale 1:3500 and the photographs 1845 
and 1847 that cover it are shown in figure 1. Control points 103, 106, 148, 176, 
178 and the points to be determined in the area of photograph 1846 are marked 
tri- in the figure. 
3500) 
ates 
Figures 2 and 3 show the distribution of standard errors of x- and y-coordina- 
tes of the new points over the area of photograph 1846. The numbers beside the 
new points denote the standard errors of the coordinates in millimeters. Figu- 
re 2 shows the standard errors of the x-coordinates. The curve closest to point 
148 is a 16 millimeter contour. 18, 20, 25 and 30 millimeter contours are also 
| indicated. 
e ,9 
  
FIGURE 2 
24 
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103 | > > s 
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o 9 : \ 
a o e S o \ \ 
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o o \ o 
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e 9 | \ o 
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Ja al IM \ 
15 o 
o 15 e 9 9 | © ol 
o | 9| o 
| | X 
16 / 
S | | V 
| | e -o— 
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8 8. ] 5) 
o / 
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/ 24 
% : N 2 o 
o o 20 C 15 
\ o Ax 23 
o — o 
x 1. 
20 o 
o _ 
23 
o 
2 Ô 
o o 9 
20 23 
Oo o 
29 
o 
26 
o 28 
ó 
23 
oO 25 
o 
o 0 
2 178 
  
  
1846