[A-CG44] Terrestrial monitoring using geostationary satellites

[ACG44-05] Advancing Geostationary Satellite Data Integration: Spectral Band Adjustment Using Hyperspectral Observations and Radiative Transfer Modeling

*Taiga Sasagawa¹, Kazuhito Ichii¹, Yuhei Yamamoto¹, Wei Yang¹, Masayuki Matsuoka², Hiroki Yoshioka³, Weile Wang⁴, Hirofumi Hashimoto⁴, Kenlo Nishida Nasahara⁵ (1.Chiba University, 2.Mie University, 3.Aichi Prefectural University, 4.NASA Ames Research Center, 5.University of Tsukuba)

Keywords:Geostationary Satellites, Data Fusion, Hyperspectral Data

Third-generation geostationary satellites, such as Japanese Himawari-8 and 9, the U.S. GOES series, Korean GK-2A, European MTG1, and Chinese Feng Yun-4, provide sub-hourly satellite observations that have significantly advanced Earth system monitoring. These hyper-temporal datasets are widely applied in ecosystem studies, particularly for vegetation monitoring, phenology analysis, gross primary production (GPP) estimation, and leaf area index (LAI) assessments using visible and near-infrared observations. However, due to the inherent orbital constraints of geostationary satellites, their coverage is regionally limited, posing challenges for global-scale data integration. To address this limitation, spectral band adjustments between different geostationary satellite sensors are essential. This study demonstrates a spectral band adjustment method that integrates 3D radiative transfer modeling with hyperspectral remote sensing data derived from both in situ and satellite observations. Our analysis revealed non-linear relationships between certain spectral bands across third-generation geostationary satellites. However, by leveraging vegetation indices, we successfully derived conversion equations to achieve a linear transformation, enabling seamless integration of hyper-temporal datasets across different satellite platforms. This approach enhances the consistency and comparability of geostationary satellite data, supporting global-scale Earth system monitoring.