ata 
in 
iip 
lom 
DEM 
is 
ATF 
reo 
DEM 
in 
in 
sor 
hus 
ing 
and 
of 
and 
MTF 
ons 
MTF 
ard 
his 
of 
and 
MTF 
ror, 
data 
in 
of 
ists 
F of 
sing 
tion 
  
MTF degradation(%) 0 
  
MTF degradation 9. 375 
  
12. 5 
Fig.2 The original SPOT/HRV imagery data 
and MTF degraded 
between tip images of stereo pair was 
assessed. The averaged cross correlation 
for 9 tip images are shown in Table 7. 
Then a relationship between cross 
correlation and stereo matching error 
was assessed. Assuming the well known 
matching method based on cross 
correlation, the averaged matching error 
was assessed by using the aforementioned 
9 tip images of MTF degraded stereo 
pair. The results are shown in Table 8. 
images 
(3) DEM aecuracy degradation 
Table 9 shows a relationship 
between sigma value of random sensor 
motion in terms of attitude jitter and 
DEM accuracy degradation. 
Therefore not only attitude changes 
but also attitude jitter should be taken 
into account in DEM estimation. 
Table 5 MTF degradation due to random image motions 
  
Sigma value of random motion(arcsec)0.44 0.88 1.32 1.76 2.20 
  
MTF degradation (%) 
12 30 45 60 
  
*IFOV of ASTER/VNIR is corresponding 
to 4.4 arcsec. 
Table £6 The sensitivities(m/arcsec) of X, Y and Z directions on 
the ground for nadir and backward viewings 
  
Nadir Viewing 
Backward Viewing 
  
X(K1) Y (K2) Z(K3) X(K4) Y (K5) Z(K6) 
Pitch 3.423 0.111 0. 653 0. 009 0.142 8. 314 
Roll 0.111 1. 722 0. 423 0. 112 1.707 0. 544 
Yaw 0.146 0. 016 0. 278 0. 057 0. 893 0. 282 
  
993