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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Soil-Adjusted Vegetation Index ： ウィキペディア英語版 Soil-Adjusted Vegetation Index Empirically derived NDVI products have been shown to be unstable, varying with soil colour, soil moisture, and saturation effects from high density vegetation. In an attempt to improve NDVI, Huete 〔Huete, A.R., (1988) 'A soil-adjusted vegetation index (SAVI)' ''Remote Sensing of Environment'', vol. 25, issue 3, pp. 259-309. DOI: 10.1016/0034-4257(88)90106-X〕 developed a vegetation index that accounted for the differential red and near-infrared extinction through the vegetation canopy. The index is a transformation technique that minimizes soil brightness influences from spectral vegetation indices involving red and near-infrared (NIR) wavelengths. The index is given as: :$\backslash mbox=\backslash frac)(\backslash mbox-\backslash mbox)\}+\backslash mbox)\}$ where L is a canopy background adjustment factor. An L value of 0.5 in reflectance space was found to minimize soil brightness variations and eliminate the need for additional calibration for different soils. The transformation was found to nearly eliminate soil-induced variations in vegetation indices.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Soil-Adjusted Vegetation Index」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.