Correction methods for aerosol and thin cirrus effects on remote sensing 

作成者 Kaufman Yoram J.
日本十進分類法 (NDC) 512.75, 450
内容 研究概要:Aerosol and cirrus clouds affect the reflected solar radiation detected by satellite sensors. Both aerosol and cirrus increase the apparent reflectance over dark surfaces such as vegetation in the visible channels by scattering sunlight to the sensor. Aerosol reduces the apparent reflectance over bright surfaces (e. g. vegetation and soils in the near IR) by absorbing reflected solar radiation on its way down to the surface and on its way up to the sensor. Correction, removal or avoidance of the atmospheric effects due to aerosol and thin cirrus clouds (we cannot correct for the effect of thick cirrus) can take several pathways: Direct correction for aerosol and thin cirrus: The effect of aerosol or cirrus on radiation is determined first and then used for direct correction of the measured radiance to derive the surface spectral reflectance. Indirect correction for aerosol: No direct correction is applied but the remote sensing functions designed to find the surface properties (e. g. the NDVI) are redesigned in order to minimize their dependence on the aerosol presence. Circumvention of the aerosol effect: In case of heavy aerosol, switching the remote sensing investigation to longer wavelengths, where the aerosol is transparent and has only a small effect, while the details of the surface cover are still evident. We shall review these techniques and bring some new insight on their applications and limitations, mainly in light of the launch in the summer of 1998 of the MODIS instrument on the NASA Earth Observing System with an array of spectral channels that will allow these correction processes.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
掲載誌情報 Proceedings of the international symposium on the atmospheric correction of satellite data and its application to global environment page.89-101 (1998)
言語 英語

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