spectral ratio中文什么意思

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Because of modis predominant space and spectral differentiate rate , it ’ s has been broadly applied to various field , in the aspect of snow monitoring , modis has been successfully using a normalized difference snow index ( ndsi ) to provide global automated binary maps of snow cover . the ndsi is a spectral ratio that takes advantage of the spectral difference of snow in short - wave infrared and visible spectral bands , although it has higher precision , it can only discern one pixel to snow or other features , can not satisfy accurate drainage basin snow cover mapping and snow parameter extracting
Modis數(shù)據(jù)因其優(yōu)越的空間分辨率、波譜分辨率,已被廣泛的運(yùn)用于各個(gè)領(lǐng)域,在積雪監(jiān)測(cè)方面,已成功地運(yùn)用歸一化差分雪蓋指數(shù)( ndsi )制作每天的全球雪蓋分布圖, ndsi是基于雪對(duì)可見(jiàn)光與近紅外波段的反射特性和反射差相對(duì)大小的一種測(cè)量方法,然而它只能將一個(gè)像元辨別為積雪或非積雪,滿足不了高精度應(yīng)用要求。

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