This paper presents absolute radiometric calibration coefficients (gains) that explain the relationship between the digital number (DN) and at-sensor radiance for the multispectral camera (MSC) on Korea's first high-resolution satellite (KOMPSAT-2). Absolute radiometric calibration was performed using a reflectance-based method. In addition, the suitability of vicarious results from radiance- and reflectance-based validations was analyzed with reference to IKONOS and QuickBird images. The latter are spectrally similar to KOMPSAT-2 images and have been validated in a large number of studies. For all bands, the R2 values of fitted lines for the gain ranged from 0.82 to 0.94, representing an improvement compared to previous findings for the KOMPSAT-2 MSC. To analyze the suitability of the vicarious results, same-pixel at-sensor radiances across different spectral bands were compared. In all bands, except the red band of QuickBird, the at-sensor radiances of KOMPSAT-2 MSC were highly correlated with those of IKONOS and QuickBird. In addition, same-pixel comparisons of reflectance across different spectral bands showed that the slopes of the least-squares lines for each band were similar to the results of the radiance comparison. The standard deviation among top of atmosphere (TOA) reflectances was within 0.019 for all bands. To calculate the tasseled cap transformation (TCT) coefficients for the KOMPSAT-2 MSC, an empirical method was applied using radiometric normalization. The results were similar to those obtained using the TCT coefficients for IKONOS and QuickBird in the brightness, greenness, and wetness components. The TCT images showed similar patterns. The absolute radiometric calibration coefficients presented here appear to be a good standard for maintaining the optical quality of the KOMPSAT-2 MSC, for which prelaunch, on-board, and vicarious calibration data are lacking.
The Compact Airborne Imaging Spectrometer System (CAISS) was designed and developed as the airborne
hyperspectral imaging system. The mission of the CAISS is to provide full contiguous spectral information with high
spatial resolution for advanced applications in the field of remote sensing. The CAISS has an ability to control the
spectral and spatial configuration of the imaging instruments. In order to understand the mechanism of imaging
spectrometer system and its characteristics, the several verification tests with the CAISS were conducted in the
laboratory. Especially, the verification of camera system was performed with the integrating sphere and spectral lamps.
In order to verify the spectral characteristics, four spectral binning (x1, x2, x4, and x8) were measured using each of the
spectral lamps and the position of the peaks was compared to the reference data sheet of each spectral lamps. For all
measurements, it was found that the spectral deviation was lower than the Full Width Half Maximum (FWHM) of the
system for each of the spectral binning. Also several interface verification tests between the CAISS and the airplane were
conducted on the ground. This paper presents the preliminary results of verification test in the camera system level and
interface test with airplane on the ground.
Much effort has been made in the radiometric calibration of the ocean scanning multispectral imager (OSMI) since after the successful launch of KOMPSAT-1 in 1999. A series of calibration coefficients for OSMI detectors were obtained in collaboration with the NASA Sensor Intercomparison and Merger for Biological and Interdisciplinary (SIMBIOS) project office. In this study, we compare the OSMI level-2 products (e.g., chlorophyll-a concentration) calculated from the NASA cross-calibration coefficients with the SeaWiFS counterparts. Sample study areas are some of diagonostic data sites recommended by the SIMBIOS working group. We will present the preliminary results of this comparative study.
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