Atmospheric optical depth effects on angular anisotropy of plant canopy reflectance
Atmospheric optical depth effects on angular anisotropy of plant canopy reflectance
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DOI：
10.1080/01431168708948697
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发表时间：
1987-06
影响因子：
3.4
通讯作者：
D. Deering;T. Eck
中科院分区：
文献类型：
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作者：
D. Deering;T. Eck
摘要通过野外试验研究了大气气溶胶光学厚度的变化是否会影响植被冠层双向反射率分布的变化。对两种牧草冠层（同种、不同生长形式）和一种大豆冠层在不同天空辐照度分布下的定向反射辐射分布进行了测量，这是由气溶胶光学厚度的变化引起的。在太阳主平面上分析了两个窄光谱带的反射辐射率数据，一个是可见光（662 nm），一个是红外线（826 nm）。从辐照度分布变化的两个波长的反射率的观察到的变化被解释为主要是由于在不完整的冠层（牧草）的传感器所看到的阴影面积的百分比的变化。对于所研究的完全覆盖植被冠层（大豆），镜面反射和增加的漫辐射穿透的影响。
Abstract A field experiment was conducted to determine whether changes in atmospheric aerosol optical depth would effect changes in bi-directional reflectance distributions of vegetation canopies. Measurements were made of the directionally reflected radiance distributions of two pasture grass canopies (same species, different growth forms) and one soya bean plant canopy under different sky irradiance distributions, which resulted from a variation in aerosol optical depth. The reflected radiance data were analysed in the solar principal plane in two narrow spectral bands, one visible (662 nm) and one infrared (826 nm). The observed changes in reflectance for both wavelengths from irradiance distribution variation is interpreted to be due largely to changes in the percentage of shadowed area viewed by the sensor for the incomplete canopies (pasture grass). For the complete coverage vegetation canopy (soya bean) studied, the effects of specular reflection and the increased diffuse irradiance penetration int...