Evaluation of Moderate Resolution Imaging Spectroradiometer land surface visible and shortwave albedo products at FLUXNET sites
Evaluation of Moderate Resolution Imaging Spectroradiometer land surface visible and shortwave albedo products at FLUXNET sites
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DOI：
10.1029/2009jd013101
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发表时间：
2010-09
影响因子：
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通讯作者：
Kaicun Wang;S. Liang;C. Schaaf;A. Strahler
中科院分区：
文献类型：
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作者：
Kaicun Wang;S. Liang;C. Schaaf;A. Strahler
[1]我们评估了2000年至2007年全球18个FLUXNET站点的中分辨率成像光谱仪（MODIS）集合4和5短波和可见光产品的准确性。虽然短波产品已经在一些现场进行了评估，但这是首次尝试评估可见光产品。由于大气分子散射和气溶胶吸收散射对可见光辐射的影响大于对红外辐射的影响，因此地面可见光辐射产品更依赖于大气校正的质量。结果显示，总体而言，MODIS Collection 4可见光产品的总体负偏差为-0.015，标准差误差为0.014，相关系数为0.88。对于Collection 5可见光产品，数值分别为−0.010、0.015和0.87。MODIS Collection 4短波产品的总体负偏差为-0.009，SD误差为0.023，相关系数为0.82。集合5短波产品的数值分别为−0.008、0.023和0.80。站点平均反射率的比较显示，集合4可见光（短波）反射率的SD为0.009（0.017），相关系数为0.94（0.90），与集合5 SD为0.008（0.017），相关系数为0.95（0.89）相似。
[1] We evaluated the accuracy of Moderate Resolution Imaging Spectroradiometer (MODIS) Collections 4 and 5 shortwave and visible albedo products at 18 FLUXNET sites globally from 2000 to 2007. While the shortwave product has been evaluated at a number of field sites, this represents the first attempt to assess the visible product. The surface visible albedo product relies more on quality of the atmospheric correction because atmospheric molecular scattering and aerosol absorption and scattering have larger impact on visible radiation than that on infrared radiation. The results show that in general the MODIS Collection 4 visible albedo product has an overall negative bias of −0.015, with a standard deviation (SD) error of 0.014 and a correlation coefficient of 0.88. The numbers are −0.010, 0.015, and 0.87 for Collection 5 visible albedo products. MODIS Collection 4 shortwave albedo product has an overall negative bias of −0.009, with a SD error of 0.023 and a correlation coefficient of 0.82. The numbers are −0.008, 0.023, and 0.80 for Collection 5 shortwave albedo products. A comparison of the site−averaged albedos shows that Collection 4 visible (shortwave) albedo has a SD of 0.009 (0.017) and a correlation coefficient of 0.94 (0.90), similar to the Collection 5 SD of 0.008 (0.017) and the correlation coefficient of 0.95 (0.89).