Incorporating Surface Emissivity into a Thermal Atmospheric Correction
Incorporating Surface Emissivity into a Thermal Atmospheric Correction
复制标题
将表面发射率纳入热大气校正
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Gillies
中科院分区：
文献类型：
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作者：
N. Brunsell;R. Gillies
作为NDVI阈值方法。以前的研究主要集中在热遥感数据的大气校正的结合上，假设大气校正已经得到解决。进行归一化植被指数（NDVI）。然而，文献缺乏使用大气校正的表面反射率描述的方法推导出的清晰的描述，该方法如何执行大气值，随后用于估计卫星植被覆盖光谱热部分的球面校正百分比。地表发射率是用线性卫星遥感近似得到的，发射率作为最小裸土发射率与算法之间插值的一部分。精确测定地表最大植被辐射率值。温度的应用需要关于该方法在1997年卫星立交桥时南部大平原大气图像上的状态的信息。另一种被广泛应用于大气分辨率辐射计（AVHRR）波段4的方法是分割窗（例如，温度校正高达8℃，平均校正为McMillan（1975）和Waltonet al.(1990)）。这种方法的温度为3.7℃。完全植被像元内的温度显示出不需要事先了解大气条件的好处——由于透射效应是在卫星立交桥上估计的，因此与各地点的气温测量结果很好地吻合（Sobrino等，1994）。根据许多假设，作为波段5和波段4的亮度温度的函数。但是，拆分窗口
as NDVI threshold methods. The issue of incorporating surface emissivity into a thermal Previous research has focused on the incorporation of atmospheric correction of thermal remotely sensed data is emissivity assuming an atmospheric correction has already addressed. The Normalized Difference Vegetation Index (NDVI) been performed. However, the literature is lacking in a clear is derived using atmospherically corrected surface reflectance description of a methodology on how to perform an atmos- values, which is subsequently used to estimate the percent of pheric correction in thethermal portion of the spectrum for sat- vegetation cover. Surface emissivity is approximated by a linear ellite remote sensing with emissivity incorporated as part of interpolation between a minimum bare soil emissivity and a the algorithm. Accurate determination of radiometric surface maximum vegetation value of emissivity. An application of temperatures requires information concerning the state of the the method to an image over the Southern Great Plains 1997 atmosphere at the time of satellite overpass. (SGP97) Hydrology Experiment for the Advanced Very High An alternate method that is widely applied for atmos- Resolution Radiometer (AVHRR) band 4 demonstrates pheric corrections of temperature is the split window (e.g., temperature corrections up to 8C, with a mean correction of McMillan (1975) and Waltonet al. (1990)). This method has the 3.7C. The temperatures within the fully vegetated pixels show benefit of notrequiring prior knowledge ofatmospheric condi- good agreement with air temperature measurements at the tions (Sobrino et al., 1994) as the transmittance effects are esti- time of satellite overpass. mated as a function of brightness temperatures in band 5 and band 4 based on many assumptions. However, split window