1 *cos 0  T(»,90) 1-T(H,7 )r(H,0). 
= T ve, 
p Lo Cosi cos © T(H, 9) '1-T(s, 0)T(, 0) (0. 7,1), 
(3)... 
where H is the flight altitude, 
y is the view angle of the scanner, zero being nadir, 
8 is the sun zenith angle, 
p is the angle between scan lines and sun azimuth, 
y is the angle between sun and scanner view direction and 
can be computed according to: 
- cos Ÿ = cos 0 cos? + sin 8 sin cosy, 
can be computed according to: 
"Uu 
cos 9 + cos P 
“COS =... s 
  
cos 
E is the extraterrestrial sun irradiance, 
S is the sky irradiance at sea level. to be measured, 
a is t'.c standard deviation describing water wave distribution, 
for n being the rcfraction index of water, 
p(Y) for any angle f" derives from 
1 sin” (¥- 1) tan^( Y ^) sin X 
pi) = $7 12 ne naar 
sin (+3) tan (+97) 
I is the total vertical atmospheric path radiance, determi- 
9 
ned thrcugh ground experiments, 
and the functions T (transmittance) and G, which depend on the wave- 
length À , are: 
cos” 
(4) T(h,K)= Ur À )-ma(h, jy 
3r(eo, À (1+cos V) t 4m(so, À )() 2) ta^ -2g cos) 
CERTE ; : 
3r(co, À \(1+cos 8) + 4m(#, X)(1-g )(1*2 *2gcos 6) 
MU [o 
where y is a constant in the range . 7 - .97 which could not'be deter- 
mined but was estimated to .9 for the flights in question here. The func- 
tions r(h,À ) and m(h, À) are terms describing Rayleigh and Mie scatter- 
ing in the atmosphere, 
z(h, À) z« (h) 0.009793 4. 09 
m(h, A) sj) ‘A OE 
where A and B are constants determined through ground experiments, 
     
    
    
   
   
  
  
  
  
  
  
  
   
   
  
  
  
  
    
     
   
  
  
    
    
dd ab dd omo B 
Sé aii Dad a