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建立了适合于TASI的热红外高光谱发射率的经验关系,以此修正了分离方法(TES)中的MMD模型,在对温度和发射率进行精度评价的基础上,将反演结果应用于城市地表温度的日较差分析。结果表明:(1)反演的温度与实测温度的平均绝对误差为1.8K,平均相对误差为0.59%;(2)地面实测宽波段发射率与反演发射率的平均差值为0.036,差值的标准差为0.032;(3)同种地物的发射率曲线的反演结果与实验室测量发射率曲线的波形是一致的;(4)温度日较差分析结果是合理的。因此,本文的反演精度能满足研究需求,将该方法应用于TASI数据的温度与发射率的分离是可行的。
The empirical relationship of hyperthermal hyperspectral emissivity for TASI was established to correct the MMD model in the separation method (TES). Based on the accuracy evaluation of temperature and emissivity, the inversion results were applied to the urban Analysis of Daily Difference of Surface Temperature. The results show that: (1) The average absolute error between inversion temperature and measured temperature is 1.8K, and the average relative error is 0.59%; (2) The average difference between measured broadband emissivity and inverted emissivity is 0.036, The standard deviation of the value is 0.032; (3) the inversion results of the emissivity curve of the same kind of objects are consistent with the waveform of the emissivity curve measured in the laboratory; (4) The result of the temperature day difference analysis is reasonable. Therefore, the retrieval accuracy of this paper can meet the research needs. It is feasible to apply this method to the separation of temperature and emissivity in TASI data.