Simulating L/L-band and C/L-band active-passive microwave covariation of crops with the Tor Vergata scattering and emission model for a SMAP-Sentinel 1 combination

M. Link, D. Entekhabi, T. Jagdhuber, P. Ferrazzoli, L. Guerriero, M. Baur, R. Ludwig
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引用次数: 1

Abstract

The NASA Soil Moisture Active Passive (SMAP) mission aims to disaggregate L-band microwave brightness temperatures (∼40 km2) with finer resolution radar backscatter (1–3 km2) to obtain an intermediate resolution soil moisture product. The disaggregation is based on a linear functional relationship between backscatter and emissivity microwave observations that is captured by a covariation parameter β. Since SMAP's L-Band radar has stopped operations in July 2015, the substitution of Sentinel 1's C-Band radar for an operational soil moisture product is in preparation. However, while multiple studies have provided understanding of active-passive covariation for the L/L-Band case, little is known about the C/L-Band case. We utilize the Tor Vergata discrete backscatter and emission model to simulate growing wheat and corn stands and calculate the covariation parameter β for the L/L-Band and C/L-Band case. The study aims to provide insights into the strength, temporal dynamics and underlying scattering mechanisms of active-passive covariation for different vegetation types and frequency combinations. Our results indicate that for the C/L-Band case, vegetation cover limitations are generally more severe, and different β-dynamics and underlying scattering mechanisms are observed with respect to the L/L-Band case.
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利用Tor Vergata散射和发射模型模拟作物L/L波段和C/L波段主动式微波共变
NASA土壤湿度主被动(SMAP)任务旨在用更精细的雷达后向散射(1-3平方公里)分解l波段微波亮度温度(~ 40平方公里),以获得中等分辨率的土壤湿度产品。分解是基于后向散射和发射率微波观测之间的线性函数关系,该关系由共变参数β捕获。由于SMAP的l波段雷达已于2015年7月停止运行,Sentinel 1的c波段雷达正在准备替代可运行的土壤湿度产品。然而,尽管多项研究提供了L/L- band病例的主动-被动共变的理解,但对C/L- band病例知之甚少。利用Tor Vergata离散后向散射和发射模型模拟小麦和玉米林分生长,计算L/L波段和C/L波段情况下的共变参数β。本研究旨在揭示不同植被类型和频率组合的主-被动共变强度、时间动态和潜在散射机制。结果表明,在C/L波段,植被覆盖限制普遍更为严重,且与L/L波段相比存在不同的β动力学和散射机制。
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