Tang Bo-Hui, Wu Hua, Li Chuanrong, Li Zhao-Liang
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
Opt Express. 2011 Jan 3;19(1):185-92. doi: 10.1364/OE.19.000185.
This work analyzed and addressed the estimate of the broadband emissivities for the spectral domains 3-14μm (ε(3-14)) and 3-∞μm (ε(3-∞). Two linear narrow-to-broadband conversion models were proposed to estimate broadband emissivities ε(3-14) and ε(3-∞) using the Moderate Resolution Imaging Spectroradiometer (MODIS) derived emissivities in three thermal infrared channels 29 (8.4-8.7μm), 31 (10.78-11.28μm) and 32 (11.77-12.27μm). Two independent spectral libraries, the Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) spectral library and the MODIS UCSB (University of California, Santa Barbara) emissivity library, were used to calibrate and validate the proposed models. Comparisons of the estimated broadband emissivities using the proposed models and the calculated values from the spectral libraries, showed that the proposed method of estimation of broadband emissivity has potential accuracy and the Root Mean Square Error (RMSE) between estimated and calculated broadband emissivities is less than 0.01 for both ε(3-14) and ε(3-∞).
本研究分析并探讨了3 - 14μm（ε(3 - 14)）和3 - ∞μm（ε(3 - ∞)）光谱域宽带发射率的估算。提出了两种线性窄带到宽带的转换模型，以利用中分辨率成像光谱仪（MODIS）在三个热红外通道29（8.4 - 8.7μm）、31（10.78 - 11.28μm）和32（11.77 - 12.27μm）得出的发射率来估算宽带发射率ε(3 - 14)和ε(3 - ∞)。使用了两个独立的光谱库，即先进星载热发射反射辐射仪（ASTER）光谱库和MODIS加州大学圣巴巴拉分校（UCSB）发射率库，来校准和验证所提出的模型。将使用所提出模型估算的宽带发射率与光谱库的计算值进行比较，结果表明所提出的宽带发射率估算方法具有潜在的准确性，并且对于ε(3 - 14)和ε(3 - ∞)，估算的宽带发射率与计算的宽带发射率之间的均方根误差（RMSE）均小于0.01。
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