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中红外双通道夜间数据地表温度反演方法

Keywords: 中红外夜间数据,地表温度,地表发射率

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Abstract:

地表温度反演是红外定量遥感的核心内容之一.与热红外(8~14μm)数据相比,中红外(3~5μm)波谱区大气透过率更高、对发射率的敏感性更低,在温度反演方面具有独特的优势.引入热红外地表温度反演思路,发展了仅利用夜间中红外双通道数据的地表温度反演算法,分析了宽通道组合(3~4μm和4~5μm)和窄通道组合(3929~3.989μm和4.020~4.080μm)模式下的温度反演精度以及模型对噪声和发射率的敏感性.结果表明,宽、窄两种通道组合模型的温度反演精度分别为~0.5K和~0.3K;噪声等效温差和地表发射率误差对窄通道组合模型的影响更大.

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