nm 
Y km 
A 
  
103 
  
  
  
Diagram 30. 
  
G2 - 
A 
Cn 
  
  
— km 
Errors (in meters) of the X-coordinates on the ground due to the combined 
effect of refraction and curvature. 
i 
d 
$ 
n 
ii 
Bl 
Ir] 
I4 
3 
hs 
E 
B 
lul 
178 
Is 
i 
n 
it 
à 
^ 
i 
i 
i 
hz 
1 
fl 
vi 
m 
CR 
EM 
ER 
ie 
k 
i: 
B 
E 
A 
s 
un 
je 
ih 
ah 
i 
thi 
m 
fl 
n 
4 
ii 
d 
FAST 
THE