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Surface and aerosol models for use in radiative transfer codes

机译：用于辐射传递代码的表面和气溶胶模型

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Abstract: Absolute reflectance-based radiometric calibrations of the Landsat-5 Thematic Mapper (TM) are improved with the inclusion of a method to invert optical-depth measurements to obtain aerosol-particle size distributions, and a nonlambertian surface reflectance model. The inverted size distributions can predict radiances varying from the previously assumed jungian distributions by as much as 5%, though the reduction in the estimated error is less than 1%. Comparison with measured diffuse-to-global ratios show that neither distribution consistently predicts the ratio accurately, and this is shown to be a large contributor to calibration uncertainties. An empirical model for the surface reflectance of White Sands, using a 2-deg polynomial fit as a function of scattering angle, was employed. The model reduced estimated errors in radiance predictions by up to 1%. Satellite calibrations dating from October 1984 were reprocessed using the improved methods, and linear estimations of satellite counts per unit radiance versus time since launch were determined, showing a decrease over time for the first four bands.!
机译：摘要：Landsat-5专题测绘仪（TM）的基于绝对反射率的辐射定标得到了改进，其中包括一种用于反转光学深度测量以获得气溶胶粒径分布的方法以及一个非朗伯表面反射率模型。倒置的尺寸分布可以预测与先前假定的荣格分布相距不超过5％的辐射率，尽管估计误差的减少小于1％。与实测扩散比与整体比值的比较表明，两种分布都不能始终如一地准确预测该比值，这表明对校准不确定度有很大的贡献。使用白沙表面反射率的经验模型，该模型使用2度多项式拟合作为散射角的函数。该模型将辐射预测中的估计误差降低了1％。使用改进的方法对自1984年10月起的卫星校准进行了重新处理，并确定了单位辐射度与发射以来时间的线性关系的线性估计，这表明前四个波段随着时间的推移而减少。

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