【摘要】：中波紅外(mid-infrared,MIR)是目前地球觀測中熱點研究的光譜區(qū)域,相比于可見光具有很多優(yōu)勢。中波紅外反射率在葉生物量估算、不同植被類型區(qū)分等方面得到了廣泛的應用。但由于在白天時衛(wèi)星傳感器接收到的輻射能量存在反射與發(fā)射能量耦合的問題,使得中波紅外數(shù)據(jù)的利用存在一些困難。本文通過類似劈窗技術的計算模型計算出無太陽輻射時地表亮溫T_g~0,并結合中波紅外輻射傳輸模型推導出了適用于VIIRS中波紅外地表雙向反射率的反演模型。結果表明:反射率理論反演值與實際值較吻合,在太陽天頂角為0°時RMSE僅為0.009;反演模型受氣象因子和儀器噪聲的影響很小,在實際應用中可以忽略。
[Abstract]:Middle wave infrared (mid-infrared,MIR) is a hot spectral region in Earth observation, which has many advantages over visible light. Middle wave infrared reflectance has been widely used in the estimation of leaf biomass and the classification of different vegetation types. However, due to the coupling of radiation energy received by satellite sensors during the day, it is difficult to utilize the medium-wave infrared data. In this paper, the surface brightness temperature T _ g _ 0 without solar radiation is calculated by using a calculation model similar to the split window technique, and the inversion model suitable for VIIRS mid-wave infrared surface reflectivity is derived in combination with the medium-wave infrared radiation transfer model. The results show that the theoretical inversion value of reflectivity is in good agreement with the actual value, the RMSE is only 0.009 when the solar zenith angle is 0 擄, and the inversion model is little affected by meteorological factors and instrument noise, and can be neglected in practical application.
【作者單位】： 北京大學地球與空間科學學院;北京大學空間信息集成與3S工程應用北京市重點實驗室;
【基金】：國家自然科學基金項目(No.41371492) 博士點基金項目(No.20130001110046)資助
【分類號】：TN21
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本文編號：2226141