Numerical experiments on the spatial scaling of land surface albedo and leaf area index
Numerical experiments on the spatial scaling of land surface albedo and leaf area index
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DOI：
10.1080/02757250009532420
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发表时间：
2000-12
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影响因子：
--
通讯作者：
S. Liang
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文献类型：
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作者：
S. Liang
了解非均质景观地表反照率和叶面积指数（LAI）的空间尺度对卫星产品的算法开发、验证和应用具有实际意义。本研究设计了数值实验，以评估从粗分辨率卫星图像中检索到的LAI值是否等同于地面“真实”值，并测试光谱BRDF和反照率是否可以从精细分辨率线性缩放到粗分辨率。这些数值实验采用了三维大气和冠层辐射传输模型。基于美国农业部（USDA） Beltsville农业研究中心（BARC）遥感验证站点夏季Landsat Thematic Mapper数据的结果表明，BRDF和反照率的标度具有很好的线性关系，当地表高度非均质时，反演的LAI值可能与真实LAI值存在较大差异。
Understanding the spatial scaling of land surface albedo and leaf area index (LAI) over heterogeneous landscapes has the practical implications to algorithm development, validation and applications of satellite products. In this study, we designed the numerical experiments to evaluate whether the retrieved LAI values from coarse‐resolution satellite imagery are equivalent to the ground “true” values, and to test whether the spectral BRDF and albedos can be linearly scaled from the fine resolutions to the coarse resolutions. These numerical experiments were conducted by using both three‐dimensional atmospheric and canopy radiative transfer models. The results based on the summer Landsat Thematic Mapper data over the US Department of Agriculture (USDA) Beltsville Agricultural Research Center (BARC) Remote Sensing Validation Site showed that the BRDF and albedo scaling is quite linear, and the retrieved LAI values could be quite different from the true LAI values if the surface is highly heterogeneous.