The Effect of Varying Moisture Content in the Retrieval of the Imaginary Part of Dielectric Constant from C-Band Frequency SAR

2020 IEEE India Geoscience and Remote Sensing Symposium (InGARSS) Pub Date : 2020-12-01 DOI:10.1109/InGARSS48198.2020.9358917

Shoba Periasamy, K. Ravi

引用次数: 0

Abstract

The imaginary part of dielectric constant (ε") was retrieved from SAR of C-band (5.36 GHz) frequency for three different moisture conditions, 25%, 50%, and 70%, using a semi-empirical model. The study has found that with 25% moisture content, the accuracy level of ε" has been considerably diluted (R2=0.702, RMSE=2.475, Bias=-2.244). The influence of roughness was observed to be higher in this particular condition. With 50% moisture content, the retrieval of ε" was significantly influenced by soil textural variations (R2=0.836, RMSE=1, Bias=-0.556) but not by surface periodicity. The simulation showed promising results (R2=0.885, RMSE=0.769, Bias=0.129) in saturated condition irrespective of the soil’s textural and roughness characteristics. The study has demonstrated that the C-band SAR is more significant in explaining ε" in a saturated state.

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含水量变化对c波段SAR介电常数虚部反演的影响

利用半经验模型反演了c波段(5.36 GHz) SAR在25%、50%和70%水分条件下的介电常数虚部(ε”)。研究发现，当水分含量为25%时，ε”的准确度水平被大大稀释(R2=0.702, RMSE=2.475, Bias=-2.244)。在这种特殊条件下，粗糙度的影响被观察到更大。当含水量为50%时，ε”的反演受土壤质地变化的显著影响(R2=0.836, RMSE=1, Bias=-0.556)，而不受地表周期性的影响。在饱和状态下，无论土壤的质地和粗糙度如何，模拟结果都令人满意(R2=0.885, RMSE=0.769, Bias=0.129)。研究表明，c波段SAR对解释饱和状态下的ε“更有意义。

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来源期刊

2020 IEEE India Geoscience and Remote Sensing Symposium (InGARSS)

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