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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Estimation of vegetation canopy leaf area index and fraction of absorbed photosynthetically active radiation from atmosphere-corrected MISR data
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Estimation of vegetation canopy leaf area index and fraction of absorbed photosynthetically active radiation from atmosphere-corrected MISR data

机译：根据大气校正的MISR数据估算植被冠层叶面积指数和吸收的光合有效辐射的比例

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摘要

The multiangle imaging spectroradiometer (MISR) instrument is designed to provide global imagery at nine discrete viewing angles and four visibleear-infrared spectral bands. This paper describes an algorithm for the retrieval of leaf area index (LAI) and fraction of photosynthetically active radiation absorbed by vegetation (FPAR) from atmospherically corrected MISR data. The proposed algorithm is designed to utilize all the information provided by this instrument, using a two-step process. The first step involves a comparison of the retrieved spectral hemispherically integrated reflectances with those determined from the model which depend on biome type, canopy structure, and soil/understory reflectances. The biome/canopy/soil/understory models that pass this comparison test are subject to the second step, which is a comparison of their directional reflectances at the MISR angles to the retrieved spectral directional reflectances. This procedure, however, can produce multiple acceptable solutions. The measure theory is used to specify the most probable values of LAI and FPAR using the set of all acceptable solutions. Optimization of the retrieval technique for efficient global processing is discussed. This paper is the second of a two-part set describing a synergistic algorithm for producing global LAI and FPAR fields from canopy reflectance data provided by the MODIS (moderate resolution imaging spectroradiometer) and MISR instruments. [References: 27]
机译：多角度成像光谱辐射仪（MISR）仪器旨在提供9个离散视角和4个可见/近红外光谱带的全局图像。本文介绍了一种从大气校正的MISR数据中检索叶面积指数（LAI）和植被吸收的光合有效辐射分数（FPAR）的算法。设计的算法旨在通过两步过程来利用该仪器提供的所有信息。第一步涉及将检索到的光谱半球积分反射率与根据模型确定的反射率进行比较，该反射率取决于生物群落类型，冠层结构和土壤/林下反射率。通过此比较测试的生物群落/冠层/土壤/林下模型要进行第二步，这是将它们在MISR角处的方向反射率与检索到的光谱方向反射率进行比较。但是，此过程可以产生多种可接受的解决方案。度量理论用于使用所有可接受的解决方案集来指定LAI和FPAR的最可能值。讨论了用于高效全局处理的检索技术的优化。本文是由两部分组成的集合中的第二部分，描述了一种协同算法，该算法可通过MODIS（中分辨率成像光谱仪）和MISR仪器提供的冠层反射数据生成全局LAI和FPAR场。 [参考：27]

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