The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
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MTF (@ Nyquist freq.): ~8% 
Linearity: < 4% (5%-95% sat.) 
The next list explains the specification of geometric part of 
KOMPSAT-2; 
POD (Precision Orbit Determination) accuracy of 3m (3a) 
with 1 day measurement data and IGS data 
Geo-accuracy 
- Post-processing without GCPs: 80m CE90; mono 
scopio image of up to 26 degrees off-nadir case, after 
post-processing including POD, PAD and AOCS sensor 
calibration 
Radiometric 
Equipment 
Spectrometer, Skyradiometer, etc. 
Geometric 
Equipment 
Total station, (GPS Receiver) 
Table 2. Cal/Val Equipments 
For the KOMPSAT-2 Cal/Val works, we need the Cal/Val 
targets that can be imaged by KOMPSAT-2 MSC, and has 
made Siemens, tarp, convex mirror, night lamp and GCP target. 
Siemens target located at Goheung has been designed to 
validate MTF and PSF etc. 
2. OVERVIEW OF KOMPSAT-2 CAL/VAL 
2.1 KOMPSAT-2 Cal/Val Parameters 
The next table 1 is the list of KOMPSAT-2 Cal/Val parameters. 
Group 
Parameter 
Method 
Cal/Val target 
Group 
Parameter 
Method 
Cal/Val target 
Spatial 
Focusing 
Cal/Val 
Edge, Siemens, 
NlgntLamp 
Radio- 
metric 
Noise 
Restoration 
Images 
Equalization 
(Vp ♦ NUC) 
Cal., 
Restoration 
Images 
GSD 
Evaluate 
GCP DB 
MTF 
Evaluate, 
Restore 
Edge, Siemens, 
Nignt Lamp 
SNR 
Evaluation 
Tarp, Images 
Non- 
Linearity 
Restoration 
Images 
TDI 
Gain 
Evaluate 
Images 
Line rate 
MTF 
GCP DB 
Dynamic 
Range 
Images 
Yaw 
Steering 
AOCS 
GCP DB 
Electric 
Gain/Offset 
Images 
MTFC 
Enhance 
PSF matrix 
Geo 
metric 
Time Sync 
DRA 
Enhance 
POD 
GCP DB 
Fusion 
Enhance 
AOCS On- 
Orb It Cal. 
GCP DB 
Absolute Radiometric 
Enhance 
Tarp, Images 
KPADS 
initialization 
GCP DB 
Users Manual 
Interior 
Orientation 
GCP DB 
1. Yellow; Evaluation & Validation 
2. Blue: Calibration & Validation 
3. Green; Cal/Val + Image Restoration 
4. White: Image Enhancement & For user 
* Interior Orientation ■ Optical Distortion + CCD 
Exterior 
Orientation 
GCP DB 
PI anl metric 
GCP DB, DEM 
Registration 
GCP DB. DEM 
Geo- 
Accuracy 
GCP DB 
Geometry 
Figure 1. Siemens target at Goheung & KOMPSAT-2 image at 
Sep 1,2006 
Angle 
(Deg.) 
Radius 
(m) 
Number 
Arc 
length 
(m) 
Total 
angel 
(Deg.) 
4.2 
68.1 
27 
5 
113.4 
Table 3. Spec, of Siemens target 
Table 1. KOMPSAT-2 Cal/Val Parameters 
The KOMPSAT-2 Cal/Val parameters are divided for 4 groups; 
Spatial, Radiometric, Geometric and For User, and each group 
have several parameters according to its property (Ryan 2003). 
‘Interior Orientation’ of Geometric includes ‘Optical 
Distortion’ & ‘Registration’ and ‘CCD Geometry’. In Table 1, 
the blue items are the parameters to initialize the KOMPSAT-2 
with Telemetry Command, the green items are the parameters 
to restore the KOMPSAT-2 performance, the yellow items are 
the parameters to validate, and the white items are product 
parameters for the end-users. 
2.2 Cal/Val Site & Equipments 
b. Tarp target 
Tarp target, portable, has been designed to validate MTF, PSF, 
SNR, Absolute radiometric Cal., etc. 
The next table 2 is the list of KOMPSAT-2 Cal/Val sites and Figure 2. Deployed Tarp target, KOMPSAT-2 image at Oct 1, 
equipments. 2006 
Target 
Cal/Val Parameter 
Site 
Siemens 
MTF 
Goheung 
Convex mirror, 
Simulated target 
MTF, GCP 
Portable 
Night Lamp 
MTF, PSF 
Portable 
Tarp 
Radiometric, MTF 
Portable 
GCP target 
Interior Orientation, Geo 
accuracy, KPADS S/W, AOCS 
On-orbit sensor calibration, 
Planimetric, Registration 
Daejeon, 
Goheung, 
Worldwide 
Reflectance 
3.5% 
23% 
35% 
53% 
Number 
8 
8 
8 
8 
Size 
5m X 20m 
Table 4. Spec, of Tarp target 
c. Night Lamp 
Night lamp (1KW) has been used to validate the MTF and PSF, 
etc.