is Tig. 
is the 
h picth 
ampling 
ns. (c) 
which 
to the 
bump of 
  
256 
26 
256 
yiteh 
‚ed with 
a posturated PSF, the essence is same and 
there will be some amount of aliasing in 
output. 
5.2 Degradation of resolution by cross talk 
Usualy a linear array has cross talk. The 
cross talk increases with wave length. 
LEVEL 
0.571428 
  
0 88 176 264 352 
PLYEL 
(a) PSF for 550nm 
  
0 2 3 4 
FREQ. 
(b) MTF for 550nm 
  
oq T T T T T T T 1 
0 88 176 264 352 
PIXEL 
(c) PSF for 850nm 
LEVEL 
32.5486 
FREQ. 
(d) MTF for 850nm 
Fig.6 Degradation of MTF by cross talk 
111 
The spatial resolution will be degraded by 
the cross talk. Fig.6 shows the degradation 
of MTF with the cross talk. This is not an 
AVNIR data, but a typical one. (a) is PSF 
for 550nm and (b) is the MTF.(c) is PSF for 
850nm and (d) is the MTF. The sensor ele- 
ment of AVNIR has same spectral sensitivity 
with commertial TV sensor. Therefore, there 
is very small cross talk in near infrared 
wavelength. Besides, stagger arrangement 
of sensor elements as Fig.3 has good effect 
on cross talk. 
5.3 Atmospheric degradation 
Atmosphere has some effect on spatial reso- 
lution for very small IFOV such as AVNIR. 
UM 
0.D714286 
LEVEL 
.5 
40 6 
PIXEL 
-0 
(a) Sin wave input pattern 
LEVEL 
0.0714286 
  
D.5 
Tr T T T T T pe 
20 40 60 80 
PIXEL 
(b) Output for 50m sin wave 
LEVEL 
0.0714286 
  
T i T T T T Li 3 
0 20 40 60 80 
PIXEL 
-0.5 
(c) Output for 16m sin wave 
Fig.7 Atmospheric effect on resolution