SPCO49-SPCOSO y olan 
  
  
  
  
r Y T T Y 
bes, | Stations : 4 4 
g 12.0 Check Points : 25 3 
Te One-Sigma in Xo.Yo.Zo : t5km | 
n 
a 10.0 Qne-Sigma in 0.0.5 : t1* 4 
4 
oO 
= 8.0 
Oo rf X 1 
r 
N > 
6.0 & s. 7 3 
z 
x Ness : 
8 7E Y Pg —9 
4.0 * 5 bl i L 
0 5 10 15 20 25 
No. of Ground Control Points 
Fig.1. Plot of accuracies in X,Y,Z for 4 sensor stations (refer to Table 2). 
       
From the left SPOT subimage From the right SPOT subimage 
Fig.2a. Orthographic images (2 x 2km? in size; 50 x 50m? grid meshes; 
41 x 41 grid nodes). 
  
  
12000 
10000 | | Total pixels i oed 
| | 
! 
Æ 8000 zx | 
= eoo]: LL 1 
2 E uid 
: [141 | 
= | Fr11 | 
4000 Hn 1 
poe 
LA 
i | E | 
11d 
  
— | 
zz 
  
ot 1 
712—10'-8 -6 -4 2 0 2 1 565 8 10 12 
  
Digital Count 
Fig.2b. Difference image (enhanced) between the two ortho-images in Fig.2a; 
shown to the right its histogram ( v — 1.6078 digital counts at 1 sigma). 
649