Soil moisture retrieval over grassland using X-band SAR data

2014 IEEE Geoscience and Remote Sensing Symposium Pub Date : 2014-07-13 DOI:10.1109/IGARSS.2014.6947271

M. El-Hajj, N. Baghdadi, G. Belaud, M. Zribi, B. Cheviron, D. Courault, F. Charron

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引用次数: 2

Abstract

The objective of this study was to analyze the sensitivity of radar signal in X-band to irrigated grassland soil conditions. Time series of radar (TerraSAR-X and Cosmo-SkyMed) images were acquired at a high temporal frequency in 2013 over a small agricultural region in South Eastern France. Simultaneously to satellite data acquisitions, ground measurements were conducted during several growing cycles of the grassland in order to monitor evolution in soil and vegetation characteristics. Results show that radar signal is clearly dependent on the soil moisture with a higher sensitivity to soil moisture for biomass lower than 1 kg/m2. HH and HV polarizations showed almost similar sensitivity to soil moisture. The penetration depth of the radar wave in X-band was high even for dense and high vegetation: flooded areas were clearly visible on the images with higher detection potential in HH polarization than in HV polarization even for vegetation heights reaching 1 m. These results showed that it is possible to track gravity irrigation and soil moisture variation from SAR X-band images acquired at high spatial resolution and medium incidence angle.

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基于x波段SAR数据的草地土壤水分反演

本研究的目的是分析x波段雷达信号对灌溉草地土壤条件的敏感性。2013年，在法国东南部的一个小农业区以高时间频率获得了时间序列雷达(TerraSAR-X和cosmos - skymed)图像。在卫星数据获取的同时，在几个生长周期进行了地面测量，以监测土壤和植被特征的演变。结果表明:土壤湿度对雷达信号有明显的依赖性，生物量低于1 kg/m2时，雷达信号对土壤湿度的敏感性较高;HH和HV极化对土壤水分的敏感性几乎相同。即使植被密集、植被高，x波段雷达波的穿透深度也很高，即使植被高度达到1 m，在HH偏振下的探测电位也比HV偏振下的探测电位高，在图像上可以清晰地看到淹没区域。结果表明，在高空间分辨率、中等入射角条件下，利用SAR x波段图像可以跟踪土壤水分变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 IEEE Geoscience and Remote Sensing Symposium

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