Toshiaki Hashimoto 
  
3.3 Map Projection 
In the work, two kinds of projection methods are adopted, Latitude/Longitude projection for middle and low latitude 
regions (60 N 60 S) and Polar Stereo projection for polar regions (90 N 50 N,50 S 90 S). A whole projected area 
is divided into 56 sub-areas shown in Figure 3. The sub-area is a scene unit for ftp. One sub-area for the 1km products 
has the dimension of (3,800L x 3,600P) for Latitude/Longitude projection and (5,005L x 5,005P) for Polar Stereo 
projection, respectively. The map projection will be carried out scene by scene. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
0° 
1 2 53 54 
55 56 
3 4 
5 0°N 30*S 
0? 
60?N : | ; : ; 1 : ! 
1 i 1 1 1 I 1 I a 1 1 
31716 17! ! ! : Lis 
1 i 1 1 1 1 1 I a 1 I 
1 u 1 1 1 I 1 I a 1 I 
1 I 1 I 1 1 I I ü i I 
| te TTT ST TTY YT 
1 I i 1 1 1 1 I 1 1 I 
I 1 1 I I 1 1 I 1 I I 
1 i i I 1 1 1 I ü 1 I 
13 ! : : | ; 
I i 1 1 I 1 1 1 i I 1 
. oy ome dl etum: 1. 1 
0 1 a 1 1 I 1 1 I i I 1 
i a 1 i I 1 1 1 a I 1 
1 a I 1 I I 1 1 a 1 I 
i 1 1 I I 1 1 I 1 I I 
1 a 1 1 1 1 1 I a 1 1 
I I 1 1 1 1 i li 1 I 1 
I i 1 1 I 1 1 1 a 1 I 
I a I 1 1 1 I 1 a 1 1 
EE TTT rT YY YT MT ry 
i i 1 1 1 1 1 1 a I 1 
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' ; : | : - ! : 
i I i i I 1 1 I I | 52 
60°S : : : : 
1 a 1 1 1 1 1 | 1 1 | 
180 W 90% 0° 90°E 180°E 
Figure 3. Sub areas for map projection 
3.4 Correction of Sensor Alignment 
During the initial check out period, the geometric accuracy will be examined with respect to the satellite position, the 
satellite attitude and the sensor alignment. If it will be found out that the sensor alignment was changed after the 
launch, the alignment should be corrected. The sensor alignment can be also corrected on the basis of collinearity 
condition (Hashimoto, H., 1999). In the equation (5), the view vector will be slightly changed by the alignment. The 
changes are specified by the optical system of the sensor. The equation (5) is linearized around the unknown 
parameters, or the alignment. 
4 EXPERIMENTS 
The actual GLI image is not yet available, off coarse. To examine the algorithm for geometric correction, the simulated 
data were generated from the OCTS data which observed around Japan. The orbit of the ADEOS was absolutely used as 
that of the ADEOS-II. The OCTS image was re-sampled to fit the resolution, the sampling ratio and the optical system 
of the GLI. 
  
146 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part Bl. Amsterdam 2000. 
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