日本地球惑星科学連合2023年大会

講演情報

[E] オンラインポスター発表

セッション記号 M (領域外・複数領域) » M-AG 応用地球科学

[M-AG33] Satellite Land Physical Processes Monitoring at Medium/High/Very High Resolution

2023年5月24日(水) 15:30 〜 17:00 オンラインポスターZoom会場 (5) (オンラインポスター)

コンビーナ:Jean-Claude Roger(University of Maryland College Park)、Shinichi Sobue(Japan Aerospace Exploration Agency)、Eric Vermote(NASA Goddard Space Flight Center)、Ferran Gascon(European Space Agency)

現地ポスター発表開催日時 (2023/5/24 17:15-18:45)

15:30 〜 17:00

[MAG33-P01] Validation of the Sentinel-2 and Landsat-8 Land Surface Reflectances

*Jean-Claude Roger1,2Eric Vermote2、Sergii skakun1、Georgia doxani3Ferran Gascon3Andrés Eduardo Santamaría-Artigas1,2 (1.University of Maryland College Park、2.NASA Goddard Space Flight Center, USA、3.ESA, Frascati)

キーワード:Surface Reflectance, Atmospheric correction, ACIX, Validation

The land surface reflectance is a fundamental climate data record at the basis of the derivation of other climate data records (Albedo, LAI/Fpar, Vegetation indices) and has been recognized as a key parameter in the understanding of the land-surface-climate processes. Here, we present the inversion and the validation of the Land surface reflectance for Landsat-8 and Sentinel-2 data.
This work relies on a generic approach developed to derive surface reflectance over land from a variety of sensors. The approach is based on the inversion of the radiative transfer equation in the Lambertian case, with no adjacency effects, that account for a simplified coupling of the absorption by atmospheric gases and scattering by molecules and aerosols as implemented in the 6SV radiative transfer code. The processing code relies on look-up tables generated by 6SV, for which the accuracy (~1%) has been well documented in several papers. The LaSRC code uses ancillary data such as pressure and gas concentrations but relies on a per pixel inversion of the aerosol properties to assure the best possible accuracy for the surface reflectance, as aerosols can be highly variable both in space and time. This new aerosol inversion builds on the extensive dataset acquired by the Terra platform, combining MODIS and MISR to derive an explicit and dynamic map of band ratio’s between blue and red channels and is a refinement of the operational approach used for MODIS and LANDSAT over the past 15 years. The aerosol inversion is generic and applicable to a variety of sensors. We use this basic approach to derive Landsat 8 and Sentinel 2 surface reflectance products.
Then, we present different schemes of validation. The first uses AERONET data with an error budget associated. The second presents performance of LaSRC inter-compared with other operational approaches in the framework of the CEOS-ACIX (Atmospheric Correction Intercomparison eXercise) Calibration Validation Task co-Lead by ESA and NASA.