Updating Absolute Radiometric Characteristics for KOMPSAT-3 and KOMPSAT-3A Multispectral Imaging Sensors Using Well-Characterized Pseudo-Invariant Tarps and Microtops II

Remote Sensing

Jisoo Hwang¹  Jonghan Ko²  Chang-Suk Lee³  Jong-Min Yeom⁴  Chul-Uong Choi⁵  Seungtaek Jeong⁶ 

[1] Application Center, Korea Aerospace Research Institute, Daejeon 34133, Korea;;Data Quality Control Team, National Satellite Operation &Applied Plant Science, Chonnam National University, Gwangju 61186, Korea;;Cal/Val &Division of Physical Metrology, Korea Research Institute of Standards and Sciences, Daejeon 35208, Korea;National Meteorological Satellite Center of Korea Meteorological Administration, Satellite Analysis Division, Jincheon-gun, Chungcheongbuk-do 27803, Korea;

关键词: KOMPSAT-3;    KOMPSAT-3A;    Microtops II;    radiometric calibration;    vicarious calibration;   

DOI  :  10.3390/rs10050697

来源: DOAJ

【 摘 要 】

Radiometric calibration of satellite imaging sensors should be performed periodically to account for the effect of sensor degradation in the space environment on image accuracy. In this study, we performed vicarious radiometric calibrations (relying on in situ data) of multispectral imaging sensors on the Korea multi-purpose satellite-3 and -3A (KOMPSAT-3 and -3A) to adjust the existing radiometric conversion coefficients according to time delay integration (TDI) adjustments and sensor degradation over time. The Second Simulation of a Satellite Signal in the Solar Spectrum (6S) radiative transfer model was used to obtain theoretical top of atmosphere radiances for both satellites. As input parameters for the 6S model, surface reflectance values of well-characterized pseudo-invariant tarps were measured using dual ASD FieldSpec® 3 hyperspectral radiometers, and atmospheric conditions were measured using Microtops II® Sunphotometer and Ozonometer. We updated the digital number (DN) of the radiance coefficients of the satellites; these had been used to calibrate the sensors during in-orbit test periods in 2013 and 2015. The coefficients of determination, R2, values between observed DNs of the sensors, and simulated radiances for the tarps were more than 0.999. The calibration errors were approximately 5.7% based on manifested error sources. We expect that the updated coefficients will be an important reference for KOMPSAT-3 and -3A users.

【 授权许可】

Unknown