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Estimation of broadband land surface emissivity from multi-spectral thermal infrared remote sensing

机译：基于多光谱热红外遥感的宽带陆地表面发射率估算

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The broadband surface emissivity is an important parameter for estimating the longwave surface energy. The broadband emissivity can vary significantly, because the spectral emissivity ranges from 0.7 to 1.0 for bare soils and rocks in the 8-12 gm range. A constant emissivity is often used for the land surface in energy balance studies and general circulation models (GCMs), because of limited information on the spatial distribution of the land surface emissivity. The spatial variation of broadband emissivity may cause a feedback and affect surface temperature. The emitted energy from the surface is proportional to emissivity. For instance, uncertainty of 0.1 in broadband emissivity corresponds to 45 W'm: at 300 K (a portion of which may be compensated by the reflected incoming radiation). Recent spacebome multispectral thermal infrared sensors, such as the advanced spacebome thermal emission and reflection radiometer (ASTER), allow the estimation of spectral emissivities from local to global scales. ASTER is a sensor onboard the earth observing system (EOS) Terra satellite launched in 1999, and has five channels in the thermal infrared region (8-12 gm). The center wavelengths of ASTER channels 10 to 14 are 8.3, 8.65, 9.1, 10.6, 11.3 pm, respectively. Using this sensor, it is possible to estimate the surface emissivity for each channel at a spatial resolution of 90 m. This study focuses on estimating the broadband emissivity from the emissivities derived from the five ASTER channels.
机译：宽带表面发射率是估计长波表面能的重要参数。宽带发射率会发生很大变化，因为对于8-12 gm范围内的裸露土壤和岩石，其光谱发射率范围为0.7至1.0。在能量平衡研究和一般环流模型（GCM）中，恒定辐射率通常用于陆地表面，因为有关陆地表面辐射率的空间分布的信息有限。宽带发射率的空间变化可能引起反馈并影响表面温度。从表面发射的能量与发射率成正比。例如，宽带发射率的0.1不确定度对应于45 W'm：在300 K时（其中一部分可以通过反射的入射辐射进行补偿）。最近的空间物体多光谱热红外传感器，例如先进的空间物体热发射和反射辐射计（ASTER），可以估计从局部到整体尺度的光谱发射率。 ASTER是1999年发射的地球观测系统（EOS）Terra卫星上的传感器，在红外热区（8-12 gm）具有五个频道。 ASTER通道10至14的中心波长分别为8.3、8.65、9.1、10.6、11.3 pm。使用该传感器，可以估计空间分辨率为90 m时每个通道的表面发射率。这项研究的重点是从五个ASTER通道的发射率估算宽带发射率。

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