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Extension of Chandrasekhar's formula to a nonhomogeneous Lambertian surface and comparison with the 6S formulation

机译:将Chandrasekhar公式扩展到非均匀朗伯曲面并与6S公式进行比较

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摘要

The classical Chandrasekhar's formula, which relates the surface albedo to the top of the atmosphere radiance, rigorously applies to a homogeneous Lambertian surface. For a nonhomogeneous Lambertian surface in a plane-parallel atmosphere, an extension of this formula was proposed in the 1980s and has been implemented recently in the 6S algorithm. To analyze this extension, the rigorous formula of the top of the atmosphere signal in a plane-parallel atmosphere bounded by a nonhomogeneous Lambertian surface is derived. Then the 6S algorithm extension is compared to the exact formula and approximations and their validity is examined. The derivation of the exact formula is based on the separation of the radiation fields into direct and diffuse components, on the introduction of the Green's function of the problem, and on integrations of boundary values of the radiation fields with Green's function.
机译:经典的Chandrasekhar公式将表面反照率与大气辐射率的顶部相关联,严格适用于均匀的朗伯表面。对于平面平行大气中的非均匀朗伯曲面,该公式的扩展是在1980年代提出的,最近已在6S算法中实现。为了分析这种扩展,推导了以非均匀朗伯表面为边界的平面平行大气中大气信号顶部的严格公式。然后将6S算法扩展与精确的公式和近似值进行比较,并检验其有效性。精确公式的推导基于将辐射场分为直接分量和扩散分量,基于问题的格林函数的引入以及辐射场的边界值与格林函数的积分。

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  • 来源
    《Applied optics》 |2007年第13期|共10页
  • 作者

    Alain Sei;

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  • 正文语种 eng
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