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A new method for remote sensing of moisture profiles in the arable layer at three frequencies; experimental case study
International Journal of Remote Sensing ( IF 3.4 ) Pub Date : 2020-12-24 , DOI: 10.1080/01431161.2020.1851795
Konstantin Muzalevskiy 1
Affiliation  

ABSTRACT In this paper, the possibilities of remote sensing of moisture profiles in the arable layer were theoretically and experimentally studied based on the nadir measurements of reflection coefficients at three frequencies of 1.26 GHz, 796 MHz and 641 MHz. The reflection coefficients were measured by the impulse method during natural cycles of evaporation and moistening of an arable layer at the agricultural field being under steam, located at 56°05ʹN, 92°40ʹ E in the area of the Minino village, Krasnoyarsk region, the Russian Federation. The soil moisture profiles were retrieved in the course of solving the inverse problem, in which the reflection coefficients at different frequencies acted as an informative sign. The root-mean-square error and the determination coefficient (R 2) between retrieved and measured moisture values in the topsoil thickness of 0.15 m were 3.3% and 0.79, respectively. In the course of theoretical calculations, it was shown that in practice, it is impossible to predict the sensing depth of the arable layer without preliminary information on the form of moisture profile. Moreover, the sensing depth depends not only on the form of soil moisture profile but also on frequency. In this regard, it is impossible to correlate the effective soil moisture, retrieved from single-frequency measurements of the reflection coefficient in the approximation of homogeneous topsoil, with the specific thickness of topsoil. The study shows the promise of developing multi-frequency radar systems for remote sensing of soil moisture profiles in the arable layer, the potential of which can be realized on lightweight unmanned area vehicle (UAV) platforms.

中文翻译:

三频率耕地层水分剖面遥感新方法 实验案例研究

摘要 在本文中,基于 1.26 GHz、796 MHz 和 641 MHz 三个频率下反射系数的最低点测量,从理论上和实验上研究了可耕地层水分剖面遥感的可能性。在位于克拉斯诺亚尔斯克地区米尼诺村地区 56°05ʹN, 92°40ʹ E 的农田蒸发和润湿自然循环期间,反射系数是通过脉冲法测量的, 俄罗斯联邦。在求解逆问题的过程中反演土壤水分剖面,其中不同频率的反射系数作为信息标志。0.15 m表层土壤中回测和实测水分值的均方根误差和决定系数(R 2 )分别为3.3%和0.79。在理论计算过程中表明,在实践中,如果没有水分剖面形式的初步信息,就不可能预测耕层的传感深度。此外,传感深度不仅取决于土壤水分剖面的形式,还取决于频率。在这方面,不可能将从均质表土近似反射系数的单频测量中反演的有效土壤水分与表土的特定厚度相关联。
更新日期:2020-12-24
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