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温度和发射率的常规定义均是针对均匀同温的物体 ,但陆地表面通常是既不同温又不均匀 ,热辐射的方向性不可忽略。在一个概念模型的基础上 ,把复杂的不同温地表分解为若干均匀同温的组分 ,建立宽波段热红外方向性辐射模型 ,并针对一个不同温的叶子冠层进行了建模及反演的实验研究。对反演结果的统计分析表明 ,此模型有较高的抗噪声能力 ,当冠层顶部及底部温度的先验预测值存在 2K偏差 ,观测噪声等效温差 (NEΔT)为 0 2 9K时 ,顶层及底层的平均反演温度与模拟真实值的偏差分别为 0 0 8K和 0 2 4K ,反演所得结果的标准偏差分别为 0 15K及 0 48K。
Conventional definitions of temperature and emissivity are for uniformly warm objects, but land surfaces are usually both warm and non-uniform, and the directivity of heat radiation can not be neglected. On the basis of a conceptual model, a complex temperature field is decomposed into several uniform temperature components, a wide band infrared radiation model is established, and a different temperature leaf canopy is modeled and inversed Experimental study. The statistical analysis of the inversion results shows that this model has a high anti-noise ability. When there is a 2K bias in the a priori predictions of the top and bottom canopy temperature and the equivalent noise temperature difference (NEΔT) is 0 2 9K, And the bottom of the average inversion temperature and simulation of the real value of the deviation were 0 0 8K and 0 2 4K, the standard deviation of the inversion results were 0 15K and 0 48K.