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中文摘要：
为了在野外准确地测量地表的双向反射系数（BRF）,在这里介绍了由角度测量装置、ASD光谱仪组成的对地光谱测量系统。测量装置的探测方向可以在同一平面内以天顶方向为起点±90°旋转,精度为1.5°,同时可以在0.2～1.5m之间调节测量高度。在探头方向固定ASD地物光谱仪光纤,可以通过改变探测管调节实际测量视场角,使测量时视场角范围变化在8°～25°。该测量系统可以测量地表目标样品的直径范围为5～50cm。同时,通过在探头方向增加的偏振装置可以实现对地表的偏振测量。
英文摘要：
For obtaining accurate measurement of the bidirectional reflectance factor of land surface in field, we introduce a system which consists of ASD spectrometer and goniometer. The direction of the probe of the spectrometer can be changed between ＋90° and -90° , which bases on the zenith is the normal, the precision is 1.5° . The height can be adjusted from 0,2 to 1.Sm. The measurement field of view can be changed from 8 o to 25 ° . The measurement system can measure the surface in a diameter of 5 - 50cm. Meanwhile, the polarization measurement may be realized by a polarized system in front of the viewing direction.
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The reflectance and negative polarization of light scattered from snow surfaces with different grain
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