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首页> 外文期刊>Remote Sensing >Development of a High Resolution BRDF/Albedo Product by Fusing Airborne CASI Reflectance with MODIS Daily Reflectance in the Oasis Area of the Heihe River Basin, China
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Development of a High Resolution BRDF/Albedo Product by Fusing Airborne CASI Reflectance with MODIS Daily Reflectance in the Oasis Area of the Heihe River Basin, China

机译：黑河流域绿洲地区的机载CASI反射率与MODIS日反射率融合的高分辨率BRDF /反照率产品的研制。

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摘要

A land-cover-based linear BRDF (bi-directional reflectance distribution function) unmixing (LLBU) algorithm based on the kernel-driven model is proposed to combine the compact airborne spectrographic imager (CASI) reflectance with the moderate resolution imaging spectroradiometer (MODIS) daily reflectance product to derive the BRDF/albedo of the two sensors simultaneously in the foci experimental area (FEA) of the Heihe Watershed Allied Telemetry Experimental Research (HiWATER), which was carried out in the Heihe River basin, China. For each land cover type, an archetypal BRDF, which characterizes the shape of its anisotropic reflectance, is extracted by linearly unmixing from the MODIS reflectance with the assistance of a high-resolution classification map. The isotropic coefficients accounting for the differences within a class are derived from the CASI reflectance. The BRDF is finally determined by the archetypal BRDF and the corresponding isotropic coefficients. Direct comparisons of the cropland archetypal BRDF and CASI albedo with in situ measurements show good agreement. An indirect validation which compares retrieved BRDF/albedo with that of the MCD43A1 standard product issued by NASA and aggregated CASI albedo also suggests reasonable reliability. LLBU has potential to retrieve the high spatial resolution BRDF/albedo product for airborne and spaceborne sensors which have inadequate angular samplings. In addition, it can shorten the timescale for coarse spatial resolution product like MODIS.
机译：提出了一种基于核驱动模型的基于土地覆盖的线性BRDF（双向反射分布函数）解混算法（LLBU），将紧凑型机载光谱成像仪（CASI）的反射率与中分辨率成像光谱仪（MODIS）相结合在中国黑河流域进行的黑河流域联合遥测实验研究（HiWATER）的焦点实验区（FEA）中，同时反射两个传感器的BRDF /反照率的每日反射乘积。对于每种土地覆盖类型，借助高分辨率分类图，通过从MODIS反射率线性解混来提取表征其各向异性反射率形状的原型BRDF。从CASI反射率中得出解释类内差异的各向同性系数。最后由原型BRDF和相应的各向同性系数确定BRDF。农田原型BRDF和CASI反照率与原位测量结果的直接比较显示出很好的一致性。将检索到的BRDF /反照率与NASA发行的MCD43A1标准产品和汇总的CASI反照率进行比较的间接验证也表明了合理的可靠性。 LLBU有潜力为角度采样不足的机载和星载传感器检索高空间分辨率BRDF /反照率产品。此外，它可以缩短MODIS等粗糙空间分辨率产品的时间尺度。

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