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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Using EO-1 Hyperion to Simulate HyspIRI Products for a Coniferous Forest: The Fraction of PAR Absorbed by Chlorophyll and Leaf Water Content (LWC)
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Using EO-1 Hyperion to Simulate HyspIRI Products for a Coniferous Forest: The Fraction of PAR Absorbed by Chlorophyll and Leaf Water Content (LWC)

机译：使用EO-1 Hyperion模拟针叶林的HyspIRI产品：叶绿素和叶片含水量（LWC）吸收的PAR分数

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摘要

This paper presents development of prototype products for terrestrial ecosystems in preparation for the future imaging spectrometer planned for the Hyperspectral Infrared Imager (HyspIRI) mission. We present a successful demonstration example in a coniferous forest of two product prototypes: fraction of photosynthetically active radiation (PAR) absorbed by chlorophyll of a canopy (fAPARchl) and leaf water content (LWC), for future HyspIRI implementation at 60-m spatial resolution. For this, we used existing 30-m resolution imaging spectrometer data available from the Earth Observing One (EO-1) Hyperion satellite to simulate and prototype the level one radiometrically corrected radiance (L1R) images expected from the HyspIRI visible through shortwave infrared spectrometer. The HyspIRI-like images were atmospherically corrected to obtain surface reflectance and spectrally resampled to produce 60-m reflectance images for wavelength regions that were comparable to all seven of the MODerate resolution Imaging Spectroradiometer (MODIS) land bands. Thus, we developed MODIS-like surface reflectance in seven spectral bands at the HyspIRI-like spatial scale, which was utilized to derive fAPARchl and LWC with a coupled canopy-leaf radiative transfer model (PROSAIL2) for the coniferous forest. With this paper, we provide additional evidence that the fAPARchl product is more realistic in describing the physiologically active canopy than the traditional fAPAR parameter for the whole canopy (fAPARcanopy), and thus, it should replace it in ecosystem process models to reduce uncertainties in terrestrial carbon cycle and ecosystem studies.
机译：本文介绍了用于陆地生态系统的原型产品的开发，为计划用于高光谱红外成像仪（HyspIRI）任务的未来成像光谱仪做准备。我们为两个产品原型的针叶林提供了一个成功的示范示例：冠层的叶绿素（fAPAR chl ）吸收的光合有效辐射（PAR）和叶含水量（LWC）的比例HyspIRI在60米空间分辨率下的实现。为此，我们使用了从地球观测一号（EO-1）Hyperion卫星获得的现有30 m分辨率成像光谱仪数据，以模拟和原型化从短波红外光谱仪可见的HyspIRI所期望的经过辐射校正的一级辐射（L1R）图像。对类似于HyspIRI的图像进行大气校正，以获得表面反射率，并对光谱进行重新采样，以产生与所有七个MODerate分辨率成像光谱仪（MODIS）陆带相当的波长区域的60-m反射率图像。因此，我们在类似HyspIRI的空间尺度上在七个光谱带中开发了类似于MODIS的表面反射率，该光谱用于通过耦合的冠层-叶辐射传递模型（PROSAIL2）推导fAPAR chl 和LWC。针叶林。通过本文，我们提供了更多的证据，那就是fAPAR chl 产品在描述具有生理活性的冠层方面比整个冠层的传统fAPAR参数（fAPAR canopy ）更现实，因此，应在生态系统过程模型中替代它，以减少陆地碳循环和生态系统研究的不确定性。

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