Estimation of the remote-sensing reflectance from above-surface measurements
Estimation of the remote-sensing reflectance from above-surface measurements
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DOI：
10.1364/ao.38.007442
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发表时间：
1999-12-20
期刊：
影响因子：
1.9
通讯作者：
Mobley, CD
中科院分区：
文献类型：
--
作者：
Mobley, CD
遥感反射率R-rs不能直接测量，在其估算中采用了各种方法。我回顾了几种常用的方法来估计R-RS的辐射传输的基础和与估计R-RS通过去除表面反射天空辐射的误差进行评估使用Hydrolight辐射传输数值模型。海面反射系数p，这不是一个固有的光学性质的表面，天空条件，风速，太阳天顶角，和观看几何形状的依赖关系进行检查。如果rho估计不准确，在接近天顶太阳位置和高风速的情况下，估计的R-rs可能会出现重大误差，这两种情况都会产生相当大的太阳闪烁效应。数值模拟表明，从最低点40度和135度从太阳的观察方向是一个合理的折衷冲突的要求。对于该观察方向，仅当风速小于5 m s（-1）时，接近0.028的rho值才是可接受的。对于较高的风速，曲线的确定rho作为太阳天顶角和风速的函数。如果天空是阴天，则在所有风速下使用接近0.028的rho值。(C)1999年美国光学学会OCIS代码：010.4450、280.0280、120.5700、030.5620。
The remote-sensing reflectance R-rs is not directly measurable, and Various methodologies have been employed in its estimation. I review the radiative transfer foundations of several commonly used methods for estimating R-rs and errors associated with estimating R-rs by removal of surface-reflected sky radiance are evaluated using the Hydrolight radiative transfer numerical model. The dependence of the sea surface reflectance factor p, which is not an inherent optical property of the surface, on sky conditions, wind speed, solar zenith angle, and viewing geometry is examined. If rho is not estimated accurately, significant errors can occur in the estimated R-rs for near-zenith Sun positions and for high wind speeds, both of which can give considerable Sun glitter effects. The numerical simulations suggest that a viewing direction of 40 deg from the nadir and 135 deg from the Sun is a reasonable compromise among conflicting requirements. For this viewing direction, a value of rho approximate to 0.028 is acceptable only for wind speeds less than 5 m s(-1). For higher wind speeds, curves are presented for the determination of rho as a function of solar zenith angle and wind speed. If the sky is overcast, a value of rho approximate to 0.028 is used at all wind speeds. (C) 1999 Optical Society of America OCIS codes: 010.4450, 280.0280, 120.5700,030.5620.