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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Analyzing the anisotropy of thermal infrared emissivity over arid regions using a new MODIS land surface temperature and emissivity product (MOD21)
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Analyzing the anisotropy of thermal infrared emissivity over arid regions using a new MODIS land surface temperature and emissivity product (MOD21)

机译：使用新的MODIS陆面温度和发射率乘积（MOD21）分析干旱地区的热红外发射率各向异性

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The MOD21 Land Surface Temperature and Emissivity (LST82E) product will be included in forthcoming Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6. Surface temperature and emissivities for thermal bands 29 (8.55 mu m), 31 (11 mu m) and 32 (12 mu m) will be retrieved using the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Temperature and Emissivity Separation (TES) method adapted to MODIS at-sensor spectral radiances, previously corrected with the Water Vapor Scaling method (MOD21 algorithm). We simulated MOD21 product estimates over two different sandy deserts (i.e. White Sands and Great Sands) using a series of MODIS scenes from 2010 to 2013. The objective of this study was to evaluate the anisotropy of the thermal infrared emissivity over semiarid regions, since angular variations of thermal infrared emissivity imply important uncertainties in satellite 1ST retrievals. The obtained LSEs and their dependence on zenith viewing angles were analyzed. Results from the MOD21 simulated algorithm showed that band 29 LSE decreased up to 0.038 from nadir to zenith angle of 60 degrees, while LSEs for bands 31 and 32 did not show significant variation. MOD21 LSE for band 29 also showed mean differences between night and daytime retrievals of +0.027 for WS and +0.009 for GS. These differences can be attributed to the water vapor adsorption of the soil from the atmosphere. MOD21 nadir and off-nadir LSEs showed a good agreement with laboratory emissivity measurements, and were used to validate with satellite data a zenithal-dependent emissivity model proposed in a previous study. (C) 2015 Elsevier Inc. All rights reserved.
机译：MOD21陆地表面温度和发射率（LST82E）产品将包含在即将发布的中等分辨率成像光谱仪（MODIS）中。6，热带29（8.55μm），31（11μm）和32（12使用先进的星载热发射和反射辐射计（ASTER）的温度和发射率分离（TES）方法（适用于MODIS传感器光谱辐射率）进行检索，该方法先前已通过水蒸气缩放方法（MOD21算法）进行了校正。我们使用2010年至2013年的一系列MODIS场景在两个不同的沙质沙漠（即白沙和大沙）上模拟了MOD21产品估算。本研究的目的是评估半干旱地区的热红外发射率各向异性，红外热辐射率的变化暗示着卫星1ST检索中的重要不确定性。分析了获得的LSE及其对天顶视角的依赖性。 MOD21模拟算法的结果表明，频带29的LSE从最低点到最高角60度下降到0.038，而频带31和32的LSE则没有显着变化。频段29的MOD21 LSE在WS上的+0.027和GS上的+0.009的夜间和白天检索之间也显示出平均差异。这些差异可以归因于土壤从大气中吸收的水蒸气。 MOD21最低点和最低点的LSE与实验室的发射率测量结果显示出良好的一致性，并被用于通过卫星数据验证先前研究中提出的天顶依赖性发射率模型。 （C）2015 Elsevier Inc.保留所有权利。

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