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Remote Sens. 2017, 9(2), 130; doi:10.3390/rs9020130

Initial Radiometric Characteristics of KOMPSAT-3A Multispectral Imagery Using the 6S Radiative Transfer Model, Well-Known Radiometric Tarps, and MFRSR Measurements

1
Cal/Val & Data Quality Control Team, National Satellite Operation & Application Center, Korea Aerospace Research Institute, Daejeon 34133, Korea
2
Center for Photometry and Radiometry, Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
3
Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University, Gangneung 25457, Korea
4
National Meteorological Satellite Center of Korea Meteorological Administration, Satellite Analysis Division, Jincheon-gun, Chungcheongbuk-do 27803, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Dongdong Wang, Richard Gloaguen and Prasad S. Thenkabail
Received: 23 September 2016 / Revised: 17 January 2017 / Accepted: 26 January 2017 / Published: 4 February 2017
View Full-Text   |   Download PDF [9417 KB, uploaded 4 February 2017]   |  

Abstract

On-orbit radiometric characterization of the multispectral (MS) imagery of the Korea Aerospace Research Institute (KARI)’s Korea Multi-Purpose Satellite-3A (KOMPSAT-3A), which was launched on 25 March 2015, was conducted to provide quantitative radiometric information about KOMPSAT-3A. During the in-orbit test (IOT), vicarious radiometric calibration of KOMPSAT-3A was performed using the Second Simulation of a Satellite Signal in the Solar Spectrum (6S) radiative transfer model. The characteristics of radiometric tarps, the atmospheric optical depth from multi-filter rotating shadowband radiometer (MFRSR) measurements, and sun–sensor–geometry were carefully considered, in order to calculate the exact top of atmosphere (TOA) radiance received by KOMPSAT-3A MS bands. In addition, the bidirectional reflectance distribution function (BRDF) behaviors of the radiometric tarps were measured in the laboratory with a two-dimensional hyperspectral gonioradiometer, to compensate for the geometry discrepancy between the satellite and the ASD FieldSpec® 3 spectroradiometer. The match-up datasets between the TOA radiance and the digital number (DN) from KOMPSAT-3A were used to determine DN-to-radiance conversion factors, based on linear least squares fitting for two field campaigns. The final results showed that the R2 values between the observed and simulated radiances for the blue, green, red, and near-infrared (NIR) bands, are greater than 0.998. An approximate error budget analysis for the vicarious calibration of KOMPSAT-3A showed an error of less than 6.8%. When applying the laboratory-based BRDF correction to the case of higher viewing zenith angle geometry, the gain ratio was improved, particularly for the blue (1.3%) and green (1.2%) bands, which exhibit high sensitivity to the BRDF of radiometric tarps during the backward-scattering phase. The calculated gain ratio between the first and second campaigns showed a less than 5% discrepancy, indicating that the determined radiometric characteristics of KOMPSAT-3A are reliable and useful to the user group for quantitative applications. View Full-Text
Keywords: KOMPSAT-3A; vicarious calibration; 6S radiative transfer model; radiometric tarps; laboratory-based BRDF; MFRSR; PSF KOMPSAT-3A; vicarious calibration; 6S radiative transfer model; radiometric tarps; laboratory-based BRDF; MFRSR; PSF
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yeom, J.-M.; Hwang, J.; Jung, J.-H.; Lee, K.-H.; Lee, C.-S. Initial Radiometric Characteristics of KOMPSAT-3A Multispectral Imagery Using the 6S Radiative Transfer Model, Well-Known Radiometric Tarps, and MFRSR Measurements. Remote Sens. 2017, 9, 130.

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