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首页> 外文期刊>International journal of applied earth observation and geoinformation >Linear unmixing of MODIS albedo composites to infer subpixel land cover type albedos
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Linear unmixing of MODIS albedo composites to infer subpixel land cover type albedos

机译：MODIS反照率复合物的线性解混以推断亚像素陆面覆盖型反照率

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摘要

We use a linear unmixing approach to test how land use and forestry maps, in combination with the MODIS BRDF/albedo product, can be used to estimate land cover type albedos in boreal regions. Operational land use maps from three test areas in Finland and Canada were used to test the method. The resulting endmember albedo estimates had low standard errors of the mean and were realistic for the main land cover types. The estimated albedos were fairly consistent with albedo measurements conducted with a telescope mast and pure pixel albedos. Problems with the method are the possible errors in the land cover maps, lack of good quality winter MODIS albedo composites and the mismatch between the MODIS pixels and the true observation area. The results emphasize the role of tree species as determinant of forest albedo. Comprehensive spatial and temporal measurements of land cover albedo are usually not possible with in situ mast measurements, and the spatial resolution of MODIS albedo product is often too low to allow direct comparison of pixel albedos and land cover types in areas with heterogeneous vegetation. Hence, and since local forestry maps exist for most temperate and boreal regions, we believe that the proposed method will be useful in estimating average regional land cover type albedos as well as in tracking changes in them.
机译：我们使用线性分解方法来测试土地使用和林业地图，再结合MODIS BRDF /反照率产品，可用于估计北方地区的土地覆盖类型反照率。该方法使用了来自芬兰和加拿大三个测试区域的可操作土地使用图。由此得出的最终成员反照率估计值的平均标准误较低，并且对于主要的土地覆盖类型是现实的。估计的反照率与用望远镜桅杆和纯像素反照率进行的反照率测量相当一致。该方法存在的问题是：土地覆盖图可能存在误差，缺乏优质的冬季MODIS反射率合成物以及MODIS像素与真实观测区域之间的不匹配。结果强调了树种作为森林反照率的决定因素的作用。用原位桅杆测量通常无法对土地覆盖的反照率进行全面的空间和时间测量，而MODIS反照率产品的空间分辨率通常太低，无法直接比较异质植被地区的像素反照率和土地覆盖类型。因此，由于大多数温带和北方地区都存在当地的林业地图，因此我们认为所提出的方法将有助于估算平均区域土地覆盖类型反照率并跟踪其中的变化。

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