ASTER代替校正のためのフィールド実験報告

摘要

The National Institute of Advanced Industrial Science and Technology (AIST) conducted the field experiment for the vicarious calibration of ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) onboard Terra satellite from September 20 to 27, 2010. The vicarious calibration is a radiometric calibration method for satellite sensors by the radiative transfer model simulation based on the ground-based measurements of the surface and atmosphere on the target. The dry lakes in the desert regions of Nevada and California (U.S.), such as Ivanpah Playa, Railroad Valley and Alkali Lake, are used as the vicarious calibration sites. In the field experiment, the surface reflectance is measured by the spectroradiometer, and the atmospheric properties, such as ozone, water vapor, and aerosol, are measured by the ozonometer and skyradiometer. In addition, the field experiment for the vicarious calibration of RSI (Remote Sensing Instrument) onboard Formosat-2 satellite launched by Taiwan was also carried out. Synchronous measurements with the overpass time of ASTER/Terra and RSI/Formosat-2 on scheduled days were performed successfully.%1．フィールド実験記1．1ASTERの代替校正（独）産業技術総合研究所（以下，産総研）では，2010年9月20日から9月27日にかけて，米国においてASTER（Advanced Spaceborne Thermal Emission and Reflection Radiometer）の代替校正のためのフィPルド実験を行いました。ASTERとは，経済産業省が開発し，1999年12月18日に打ち上げられた米国航空宇宙局（NASA）のEOS（Earth Observation System）計画におけるTerra衛星に搭載されている高性能光学センサで，可視近赤外放射計（VNIR：Visible and Near Infrared Radiometer），短波長赤外放射計（SWIR：Short Wave Infrared Radiometer），熱赤外放射計（TIR：Thermal Infrared Radiometer）により構成されており，可視から熱赤外域まで計14バンドでの観測が可能となっています1）。