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首页> 外文期刊>Remote Sensing Reviews >Spectral Bidirectional Reflectance Characteristics of Russian Steppe Vegetation and Comparison to US Prairie Grasslands
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Spectral Bidirectional Reflectance Characteristics of Russian Steppe Vegetation and Comparison to US Prairie Grasslands

机译：俄罗斯草原植被的光谱双向反射特性与美国草原草原的比较

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摘要

The spectral, solar angle, and view angle variability of the bidirectional reflectance of vegetation canopies has the potential for yielding information on various biophysical and structural aspects of the canopy. Several existing and future satellite sensors provide measurements from which plant canopy bidirectional reflectances can be inferred. However, in order to fully utilize the potential of these satellite measurements, a more complete understanding of the dynamics of vegetation canopy optical reflectance is needed. In this study we present measurements of the dynamics of the bidirectional reflectance of several grassland canopies. Measurements were made with the Portable Apparatus for Rapid Acquisition of Bidirectional Observations of the Land and Atmosphere (PARABOLA) instrument in three spectral bands (662, 826, and 1658 nm) for steppe grassland sites of differing productivity levels in the Streletskaya Steppe Reserve, Russia. Variations in solar principal plane reflectance and vegetation indices as a function of view angle and solar zenith angle are presented. Comparisons are made with PARABOLA measurements from selected FIFE grassland sites in the Konza Prairie, Kansas. The Streletskaya Steppe sites showed no strong hot spot reflectance, while this effect was present in some FIFE sites in the red waveband but absent in others. The hot spot effect appears to be dependent on canopy geometry and background reflectance characteristics of these sites. The FIFE sites which did exhibit hot spot reflectance maxima in the red waveband showed a larger variation of NDVI with view angle than other sites since the hot spot maxima did not occur for the near-infrared waveband.
机译：植被冠层的双向反射的光谱，太阳角和视角可变性具有产生关于冠层的各种生物物理和结构方面的信息的潜力。现有的和将来的几种卫星传感器都可以提供测量结果，从中可以推断出植物冠层的双向反射率。但是，为了充分利用这些卫星测量的潜力，需要对植被冠层光反射的动力学有一个更完整的了解。在这项研究中，我们介绍了几种草地冠层的双向反射动力学的测量结果。使用便携式设备快速获取了陆地和大气双向观测的仪器（PARABOLA），在三个光谱带（662、826和1658 nm）中对俄罗斯Streletskaya草原保护区的不同生产力水平的草原地区进行了测量。提出了太阳主平面反射率和植被指数随视角和太阳天顶角的变化。比较了堪萨斯州Konza Prairie的一些FIFE草地场的PARABOLA测量值。 Streletskaya草原站点没有显示出很强的热点反射率，而这种影响在红色波段的某些FIFE站点中存在，而在其他波段则不存在。热点效应似乎取决于这些位置的树冠几何形状和背景反射特性。在红色波段中确实表现出热点反射最大值的FIFE站点在视角上显示出NDVI的变化比其他站点更大，因为在近红外波段并未出现热点最大值。

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