Improvements in Aerosol Optical Depth Estimation Using Multiangle CHRIS/PROBA Images
Improvements in Aerosol Optical Depth Estimation Using Multiangle CHRIS/PROBA Images
复制标题
使用多角度 CHRIS/PROBA 图像改进气溶胶光学深度估计
DOI：
10.1109/tgrs.2009.2027024
复制
发表时间：
2010
影响因子：
8.2
通讯作者：
M. Barnsley
中科院分区：
文献类型：
--
作者：
W. Davies;P. North;W. Grey;M. Barnsley
利用高空间分辨率、高光谱和多角度的紧凑型高分辨率成像光谱仪（CHRIS）/机载自主项目（PROBA）图像，研究了陆面气溶胶光学厚度（AOD）的估算方法。CHRIS仪器安装在PROBA卫星上，提供多达62个波段。PROBA卫星允许在短时间间隔内从五个不同的视角获取图像。该方法使用反演的耦合表面/大气辐射传输模型，并包括一个一般的物理模型的角表面反射率。使用迭代过程来确定最佳值，该最佳值提供了针对多个视角和波长的校正的反射率值与由物理模型提供的那些的最佳拟合。这种方法以前已经证明了从先进的沿轨扫描辐射计的数据，并在这里扩展到光谱和角度采样的CHRIS/PROBA。从这些观测获得的值进行验证使用地面太阳光度计测量。从22个图像集的结果显示，在550 nm的AOD的均方根误差为0.11，这是减少到0.06后，自动筛选程序。
A method has been developed to estimate aerosol optical depth (AOD) over land surfaces using high spatial resolution, hyperspectral, and multiangle Compact High Resolution Imaging Spectrometer (CHRIS)/Project for On Board Autonomy (PROBA) images. The CHRIS instrument is mounted aboard the PROBA satellite and provides up to 62 bands. The PROBA satellite allows pointing to obtain imagery from five different view angles within a short time interval. The method uses inversion of a coupled surface/atmosphere radiative transfer model and includes a general physical model of angular surface reflectance. An iterative process is used to determine the optimum value providing the best fit of the corrected reflectance values for a number of view angles and wavelengths with those provided by the physical model. This method has previously been demonstrated on data from the Advanced Along-Track Scanning Radiometer and is extended here to the spectral and angular sampling of CHRIS/PROBA. The values obtained from these observations are validated using ground-based sun-photometer measurements. Results from 22 image sets show an rms error of 0.11 in AOD at 550 nm, which is reduced to 0.06 after an automatic screening procedure.