Korean J. Remote Sens. 2023; 39(6): 1273-1281

Published online: December 31, 2023

https://doi.org/10.7780/kjrs.2023.39.6.1.8

© Korean Society of Remote Sensing

Radiometric Tarp를 이용한 현장관측 기반의 차세대중형위성 1호 절대복사보정 사례 연구

전우진 1)·염종민2)·정재헌3)·진경욱4)·한경수 5)*

1) 한국항공우주연구원 지상국기술연구부 연구원(Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 2) 전북대학교 지구환경과학과 부교수(Associate Professor, Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, Republic of Korea) 3) 한국항공우주연구원 지상국기술연구부 선임연구원(Senior Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 4) 한국항공우주연구원 지상국기술연구부 책임연구원(Principal Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 5) 부경대학교 지구환경시스템과학부 공간정보시스템공학전공 교수(Professor, Major of Spatial Information Engineering, Division of Earth Environmental Science, Pukyong National University, Busan, Republic of Korea)

A Case Study on Field Campaign-Based Absolute Radiometric Calibration of the CAS500-1 Using Radiometric Tarp

전우진 1)·염종민2)·정재헌3)·진경욱4)·한경수 5)*

Abstract

Absolute radiometric calibration is a crucial process in converting the electromagnetic signals obtained from satellite sensors into physical quantities. It is performed to enhance the accuracy of satellite data, facilitate comparison and integration with other satellite datasets, and address changes in sensor characteristics over time or due to environmental conditions. In this study, field campaigns were conducted to perform vicarious calibration for the multispectral channels of the CAS500-1. Two valid field observations were obtained under clear-sky conditions, and the top-of-atmosphere (TOA) radiance was simulated using the MODerate resolution atmospheric TRANsmission 6 (MODTRAN 6) radiative transfer model. While a linear relationship was observed between the simulated TOA radiance of tarps and CAS500-1 digital numbers (DN), challenges such as a wide field of view and saturation in CAS500- 1 imagery suggest the need for future refinement of the calibration coefficients. Nevertheless, this study represents the first attempt at absolute radiometric calibration for CAS500-1. Despite the challenges, it provides valuable insights for future research aiming to determine reliable coefficients for enhanced accuracy in CAS500-1’s absolute radiometric calibration.

Keywords CAS500-1, Radiometric calibration, Vicarious calibration, MODTRAN 6 radiative transfer model, Radiometric tarp

Korean J. Remote Sens. 2023; 39(6): 1273-1281

Published online December 31, 2023 https://doi.org/10.7780/kjrs.2023.39.6.1.8

Copyright © Korean Society of Remote Sensing.

Radiometric Tarp를 이용한 현장관측 기반의 차세대중형위성 1호 절대복사보정 사례 연구

전우진 1)·염종민2)·정재헌3)·진경욱4)·한경수 5)*

1) 한국항공우주연구원 지상국기술연구부 연구원(Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 2) 전북대학교 지구환경과학과 부교수(Associate Professor, Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, Republic of Korea) 3) 한국항공우주연구원 지상국기술연구부 선임연구원(Senior Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 4) 한국항공우주연구원 지상국기술연구부 책임연구원(Principal Researcher, Department of Satellite Ground Station R&D Division, Korea Aerospace Research Institute, Daejeon, Republic of Korea) 5) 부경대학교 지구환경시스템과학부 공간정보시스템공학전공 교수(Professor, Major of Spatial Information Engineering, Division of Earth Environmental Science, Pukyong National University, Busan, Republic of Korea)

A Case Study on Field Campaign-Based Absolute Radiometric Calibration of the CAS500-1 Using Radiometric Tarp

전우진 1)·염종민2)·정재헌3)·진경욱4)·한경수 5)*

Abstract

Absolute radiometric calibration is a crucial process in converting the electromagnetic signals obtained from satellite sensors into physical quantities. It is performed to enhance the accuracy of satellite data, facilitate comparison and integration with other satellite datasets, and address changes in sensor characteristics over time or due to environmental conditions. In this study, field campaigns were conducted to perform vicarious calibration for the multispectral channels of the CAS500-1. Two valid field observations were obtained under clear-sky conditions, and the top-of-atmosphere (TOA) radiance was simulated using the MODerate resolution atmospheric TRANsmission 6 (MODTRAN 6) radiative transfer model. While a linear relationship was observed between the simulated TOA radiance of tarps and CAS500-1 digital numbers (DN), challenges such as a wide field of view and saturation in CAS500- 1 imagery suggest the need for future refinement of the calibration coefficients. Nevertheless, this study represents the first attempt at absolute radiometric calibration for CAS500-1. Despite the challenges, it provides valuable insights for future research aiming to determine reliable coefficients for enhanced accuracy in CAS500-1’s absolute radiometric calibration.

Keywords: CAS500-1, Radiometric calibration, Vicarious calibration, MODTRAN 6 radiative transfer model, Radiometric tarp

KSRS
October 2024 Vol. 40, No.5, pp. 419-879

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