The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B1. Beijing 2008 
55 
Figure 3. Night lamp and KOMPSAT-2 image at Feb 27, 2007 
d. GCP DB 
GCP DB for the KOMPSAT-2 Geometric Cal/Val has been 
establishing at Daejeon, Goheung, Seosan, Gwangyang and 
Kimje in Korea located along with KOMPSAT-2 orbit pass 
before KOMPSAT-2 launch to calibrate and validate the 
KPADS S/W initialization, AOCS on-orbit Cal., interior 
orientation, exterior orientation, band-to-band registration and 
geo-accuracy check. 5 GCP DB sites have 200 ~ 300 GCPs 
with less than 10 cm accuracy. 
- Absolute radiometric Cal. & Image quality 
3. THE RESULT OF CAL/VAL 
3.1 Beginning results 
After KOMPSAT-2 launch, the next Cal/Val parameters had 
been decided firstly; 
• Primary TDI level: 43413 (PAN, Green, Blue, NIR, Red) 
• Secondary TDI level: 32301 
• Default PAN: PAN Redundant because of checking the image 
quality (Random & Pattern Noise) 
• MS Color disposition 
MSI: Green, MS2: Blue, MS3: NIR, MS4: Red 
• Spilling 
Figure 4. (Five) GCP DB sites in Korea located along with 
KOMPSAT-2 orbit pass 
2.3 Cal/Val Work Step 
The next Figure 5 explains the KOMPSAT-2 Cal/Val work step 
after launch. IRPE means KOMPSAT-2 data processing system. 
Figure 6. Spilling in K2 MSC image 
• Line of Sight 
MS2 (Blue) & MS4 (Red) -*■ MSI (Green) & MS3 (NIR) 
-> PAN-R 
Image data 
+ CD 
> 
BUS 
Payload 
Ancillary data 
<2> 
Co-Work 
Only KARI 
USERS 
Image data 
IRPE 
© 
\ 
© 
Figure 5. KOMPSAT-2 Cal/Val work step after launch 
0 Evaluate the basic KOMPSAT-2 Cal/Val parameters 
- MTF, SNR, GSD, FOV, Linearity, Dynamic range 
0 Cal/Val the Payload and KOMPSAT-2 parameters 
- Time sync, POD, AOCS, PAD, Interior orientation 
- NUC, TDI gain, Electric gain/offset 
® Image restoration in IRPE 
- Reduce Noise, LF NUC, Exterior orientation 
- MTFC, Registration 
@ Image enhancement 
- DRA (Dynamic Range Assessment), Fusion 
© Information for Users 
Figure 7. Line of Sight in K2 MSC 
MSC Pixel definition as reflected on Ground 
MS 2&4 (Blue&Red) 
MS 1&3 (Green&NIR) 
PAN-P channel 
PAN-R channel 
g 
T 
15K 4 3 2 1 
4 3 21 
Figure 8. Line of Sight on Ground 
Check GSD (Ground Sample Distance)