Improving MODIS surface BRDF/Albedo retrieval with MISR multiangle observations
Improving MODIS surface BRDF/Albedo retrieval with MISR multiangle observations
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DOI：
10.1109/tgrs.2002.801145
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发表时间：
2002-11
期刊：
影响因子：
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通讯作者：
Yufang Jin;F. Gao;C. Schaaf;Xiaowen Li;A. Strahler;C. Bruegge;J. Martonchik
中科院分区：
文献类型：
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作者：
Yufang Jin;F. Gao;C. Schaaf;Xiaowen Li;A. Strahler;C. Bruegge;J. Martonchik
我们探索了一种使用多角度成像光谱仪（MISR）和中等分辨率成像光谱仪（MODIS）的互补角采样的协同方法来改善MODIS表面双向反射分布函数（BRDF）和反击试验。初步案例研究表明，在绿色，红色和近红外，MODI和MISR表面双向反射因子（BRF）通常是可比的。引入了信息索引来表征定向采样的信息内容，发现MISR角度观察可以为MODIS检索带来其他信息，尤其是当MISR观测值接近主平面时。我们使用从MISR表面BRF衍生的BRDF参数作为先验信息，并通过MODIS观察得出表面BRDF参数的后验估计。结果表明，与从MODIS仅接近跨首将平面的仅取回相比，在红色和绿色中，在红色和绿色中，相对BRF预测误差最多可将相对BRF预测误差减少多达10％。
We explore a synergistic approach to use the complementary angular samplings from the Multi-angle Imaging SpectroRadiometer (MISR) and Moderate Resolution Imaging Spectroradiometer (MODIS) to improve MODIS surface bidirectional reflectance distribution function (BRDF) and albedo retrieval. Preliminary case studies show that MODIS and MISR surface bidirectional reflectance factors (BRFs) are generally comparable in the green, red, and near infrared. An information index is introduced to characterize the information content of directional samplings, and it is found that MISR angular observations can bring additional information to the MODIS retrieval, especially when the MISR observations are close to the principal plane. We use the BRDF parameters derived from the MISR surface BRFs as a priori information and derive a posteriori estimates of surface BRDF parameters with the MODIS observations. Results show that adding MISR angular samplings can reduce the relative BRF prediction error by up to 10% in the red and green, compared to the retrievals from MODIS-only observations which are close to the cross-principal plane.