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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >L-Band Passive and Active Signatures of Vegetated Soil: Simulations With a Unified Model
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L-Band Passive and Active Signatures of Vegetated Soil: Simulations With a Unified Model

机译：植被土壤的L波段被动和主动特征：统一模型的模拟

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The synergistic exploitation of L-band active and passive measurements has received increasing interest. In this paper, both theoretical simulations and experimental data are employed to get a deeper insight into the relations between the backscattering coefficient and the emissivity. An active/passive discrete model is used to simulate the backscattering coefficient and the emissivity of bare soil, maize crop of various heights, and deciduous forests of various biomass values. Volumetric soil moisture is varied in a 5–40% range. Simulations confirm the already known effects of soil moisture (whose increase produces a decrease in emissivity e and an increase in backscattering coefficient ${sigma ^0}$ ) and the effects of vegetation growth that yields an increase in both ${sigma ^0}$ and e. Experimental data collected by four airborne campaigns and spaceborne active/passive instruments, together with ground measurements, are also reported. Simulated data are used to investigate the sensitivity of active and passive measurements to soil moisture variations under different vegetation covers, and to estimate the coefficient of a linear relation between backscattering coefficient and emissivity.
机译：L波段有源和无源测量的协同开发已引起越来越多的关注。本文采用理论模拟和实验数据对背向散射系数与发射率之间的关系进行了更深入的了解。主动/被动离散模型用于模拟裸土，各种高度的玉米作物以及各种生物量值的落叶林的反向散射系数和发射率。土壤含水量在5-40％范围内变化。模拟结果证实了土壤水分的已知影响（其增加会导致发射率e降低，而后向散射系数$ {sigma ^ 0} $会增加）以及植被生长的影响会导致$ {sigma ^ 0}均增加$和e。还报告了四个空降战役和星载主动/被动仪器收集的实验数据，以及地面测量数据。模拟数据用于研究主动和被动测量对不同植被覆盖下土壤水分变化的敏感性，并估计反向散射系数与发射率之间线性关系的系数。

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