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为了进一步理解遥感观测中地表目标物二向性反射特性产生的影响,增强定量反演植被结构和生理参数的能力,以江西千烟洲通量站为基地建立了多角度高光谱观测系统。此系统主要由UniSpec-DC双通道光谱仪、Pan-TiltUnit可水平垂直旋转的云台、电脑、电力供应系统、软件控制系统,以及数据转换器等配件组成。获得的光谱数据经白板校正、暗电流校正、超量程数据插补、异常数据删除、缺失角度插补等预处理后可用于冠层反射率和植被指数的计算与定量分析。多角度高光谱观测系统观测的辐照度与通量观测的光合有效辐射(PAR)具有较好的一致性(R~2=0.9614,P<0.001)。利用2013年7月观测得到的光谱和通量数据计算得到光化学反射指数(PRI)与光能利用率(LUE),二者表现出明显的对数关系(R~2=0.5142,P<0.001)。分析认为,多角度高光谱遥感是定量研究森林生态系统的重要手段,也是进一步理解航空航天遥感与样地观测尺度问题的有效方法。
In order to further understand the influence of the reflection properties of the surface targets on the remote sensing observations and to enhance the capability of quantitatively retrieving the vegetation structure and physiological parameters, a multi-angle hyperspectral observation system was established based on the Qianyanzhou Flux Station in Jiangxi Province. The system consists of UniSpec-DC dual-channel spectrometer, Pan-TiltUnit pan / tilt head, computer, power supply system, software control system and data converter. The obtained spectral data can be used for the calculation and quantitative analysis of canopy reflectance and vegetation index after white plate correction, dark current correction, overrange data interpolation, anomalous data deletion, missing angle interpolation and other pretreatment. The observed irradiance of multi-angle hyperspectral observation system is in good agreement with the flux observed PAR (R ~ 2 = 0.9614, P <0.001). The photochemical reflectance (PRI) and light energy utilization (LUE) were calculated using the observed spectra and flux data from July 2013, and both showed a significant logarithmic relationship (R ~ 2 = 0.5142, P <0.001) . It is concluded that multi-angle hyperspectral remote sensing is an important means to quantitatively study forest ecosystems and an effective method to further understand the scale of aerospace remote sensing and sample observation.