Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 271-274, 2016
03 Jun 2016
Absolute Radiometric Calibration of KOMPSAT-3A
H. Y. Ahn1, D. Y. Shin1, J. S. Kim1, D. C. Seo2, and C. U. Choi1 1Dept. of Spatial Information Engineering, Pukyong National University 45, Yongso-ro, Nam-gu, 45813 Rep. of Korea
2Data Processing & Cal/Val Team, Korea Aerospace Research Institute, 169-84, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Rep. of Korea
Keywords: Radiometric Calibration, TOA Radiance, KOMPSAT-3A, Radiative Transfer Code Abstract. This paper presents a vicarious radiometric calibration of the Korea Multi-Purpose Satellite-3A (KOMPSAT-3A) performed by the Korea Aerospace Research Institute (KARI) and the Pukyong National University Remote Sensing Group (PKNU RSG) in 2015.The primary stages of this study are summarized as follows: (1) A field campaign to determine radiometric calibrated target fields was undertaken in Mongolia and South Korea. Surface reflectance data obtained in the campaign were input to a radiative transfer code that predicted at-sensor radiance. Through this process, equations and parameters were derived for the KOMPSAT-3A sensor to enable the conversion of calibrated DN to physical units, such as at-sensor radiance or TOA reflectance. (2) To validate the absolute calibration coefficients for the KOMPSAT-3A sensor, we performed a radiometric validation with a comparison of KOMPSAT-3A and Landsat-8 TOA reflectance using one of the six PICS (Libya 4). Correlations between top-of-atmosphere (TOA) radiances and the spectral band responses of the KOMPSAT-3A sensors at the Zuunmod, Mongolia and Goheung, South Korea sites were significant for multispectral bands. The average difference in TOA reflectance between KOMPSAT-3A and Landsat-8 image over the Libya 4, Libya site in the red-green-blue (RGB) region was under 3%, whereas in the NIR band, the TOA reflectance of KOMPSAT-3A was lower than the that of Landsat-8 due to the difference in the band passes of two sensors. The KOMPSAT-3Aensor includes a band pass near 940 nm that can be strongly absorbed by water vapor and therefore displayed low reflectance. Toovercome this, we need to undertake a detailed analysis using rescale methods, such as the spectral bandwidth adjustment factor.
Conference paper (PDF, 2207 KB)

Citation: Ahn, H. Y., Shin, D. Y., Kim, J. S., Seo, D. C., and Choi, C. U.: Absolute Radiometric Calibration of KOMPSAT-3A, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 271-274, doi:10.5194/isprs-archives-XLI-B1-271-2016, 2016.

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