[A-CG41] 衛星による地球環境観測

[ACG41-P18] Cross- and inter-band calibrations of the Hyperspectral Imager Suite (HISUI) and potential applications to coastal environmental monitoring

*水落 裕樹¹、土田 聡¹、山本 聡¹、浦井 稔¹、松岡 萌¹、池田 あやめ¹、岩男 弘毅¹ (1.産業技術総合研究所)

キーワード：相互校正、衛星ハイパースペクトルセンサ（HISUI）、沿岸域環境モニタリング

Hyperspectral remote sensing provides detailed spectral features of the Earth’s surface and have revealed a wide range of applications in environmental monitoring. One of the recent spaceborne hyperspectral imagers, the Hyperspectral Imager Suite (HISUI), was installed on the International Space Station (ISS) in 2019 and had acquired several hundred thousand scenes up to now. In this study, we provide recent results of cross- and inter-band calibration activities to ensure inter-band consistency and time-series stability of HISUI radiance data. Using well-calibrated reference sensors (the Moderate Resolution Imaging Spectroradiometer; MODIS) with correction of difference in spectral response function, spatial resolution, sensor geometry from HISUI, we revealed time-series change in sensor sensitivity of HISUI from 2021 to 2023. In particular, substantial discrepancy between the visible to near-infrared (VNIR) and short-wave infrared (SWIR) domains was reported, contributing to update of HISUI calibration parameters to create spectrally consistent product. We further discuss potential applications of spaceborne hyperspectral imagers to shallow-water environmental monitoring, including benthic cover classification, water depth mapping, and water quality (e.g., chl-a) estimation.