2008 
53 
SUMMARY OF CALIBRATION AND VALIDATION FOR KOMPSAT-2 
Dong-Han Lee 3 , D.C. Seo, J.H. Song, M.J. Choi, H.S. Lim 
3 Satellite Data Information Team, Korea Aerospace Research Institute (KARI), 45 Eoeun-dong Yuseong-gu, Daejeon 
305-333, South Korea - dhlee@kari.re.kr 
Commission I, WG 1/1 
KEY WORDS: Passive Optical system, Geometry, Radiometry, Camera, Sensor, KOMPSAT-2 
ABSTRACT: 
KARI has been doing Calibration and Validation (Cal/Val) activities for the KOMPSAT-2 (KOrea Multi-Purpose SATellite-2) after 
launch at July 28th 2006. The Cal/Val for KOMPSAT-2 has already been done to guarantee the requirements of KOMPSAT-2 Users, 
and we are doing more Cal/Val activities to enhance the KOMPSAT-2 image quality for Users. The content of KOMPSAT-2 
Cal/Val defined before launch has been a little changed after launch. After launch, we could find out the new and different 
phenomenon from analyzing the KOMPSAT-2 image data directly. Firstly, we tried to define the status of KOMPSAT-2 (e.g. the 
sequence of MS band, Line of Sight, Pointing accuracy, etc.). Secondly, every KOMPSAT-2 Cal/Val parameter was validated, and 
then KOMPSAT-2 was calibrated with the validated and uploaded initial value of them (e.g. Non-Uniformity Correction table, 
Misalignment between body and sensor etc.). Finally, we have done to implement the KOMPSAT-2 image data processing system 
with the results of K2 Cal/Val (e.g. De-noise, MTF compensation, Metadata, Users Manual, etc.) 
1. INTRODUCTION 
1.1 Overview 
After KOMPSAT-2 launched at July 28th 2006, the Cal/Val for 
KOMPSAT-2 image quality has been doing and implementing 
the KOMPSAT-2 image data processing system with it in 
KARI. Generally, because the present remote sensing satellite 
technique cannot satisfy user’s requirements for image quality, 
the Cal/Val for image quality must be carried out directly after 
launch before distributing the imagery to the users. In the broad 
concept of Cal/Val, the Cal/Val of the remote sensing satellite 
can be divided into two parts if we recognize the technical gap 
between the satellite technique and the users requirements; 
Cal/Val to validate and verify the requirements of satellite, and 
Cal/Val and image restoration to guarantee the image data 
quality for the users. The KOMPSAT-2 Cal/Val has been 
carried out with this concept. Before KOMPSAT-2 launched, 
KARI Cal/Val team had prepared and developed Cal/Val sites, 
equipments and Cal/Val code for KOMPSAT-2 in KARI’s own 
way. After launch, we can immediately understand the gap 
between the real Cal/Val and our own way from the new and 
different phenomenon and our mistakes form analyzing the 
KOMPSAT-2 image data. The first gap between them was the 
understanding of image quality for the users. We re-defined the 
KOMPSAT-2 Cal/Val according to them, and have done it in 
the first step of the KOMPSAT-2 Cal/Val, and now work to get 
better image quality of KOMPSAT-2 in the second step in 
KOMPSAT-2 normal operation phase. 
This paper explains the overview of KOMPSAT-2 Cal/Val and 
the basic Cal/Val results. Seo 2008 paper explains the 
Geometric Cal/Val of KOMPSAT-2, and Lee 2008 does Image 
Restoration for Cal/Val of KOMPSAT-2 
1.2 KOMPSAT-2 basic specification 
The next list explains mission orbit of the KOMPSAT-2; 
Sun synchronous orbit 
Altitude: 685.13km 
Inclination: 98.127° 
Local time of ascending node: 10:50 AM 
180° phase difference with KOMPSAT-1 
Roll tilt: ±30° 
The next list explains the specification of the MSC (Multi- 
Spectral Camera) of the KOMPSAT-2 main payload; 
Pushbroom imaging 
20% duty cycle imaging per orbit 
Swath width: 15km±2% 
Effective Swath width: 13.6km 
lm Panchromatic (1 ch.) & 4m Multi-spectral (4 ch.) 
No. of Pixel 
- PAN: 15000 pixel (3 CCD; 1 CCD = 5200 pixel x 32 
TDI line) 
- MS: 3792 pixel 
No. of PAN line: 2 (two; Primary & Redundant) 
Pixel size: 13x13 pm 
TDI line rate: up to 7100 lines/sec 
Radiometric resolution: 10 bits per pixel 
TDI (Time Delayed Integration): 32 lines 
Data compression: JPEG-like, 1:3.6 for PAN & Multi 
Non-uniformity correction before compressing 
Electric Gain setting 
Clear Aperture: 600mm 
FOV: ±0.62° 
PAN 
- EFL: 9000mm 
- Spectral region: 500nm - 900nm 
MS Channel 
- EFL: 2250mm 
- Spectral region 
MSI (Green): 450nm ~ 520nm 
MS2 (Blue): 520nm ~ 600nm 
MS3 (NIR): 630nm ~ 690nm 
MS4 (Red): 760nm - 900nm