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[Experimental Study on Soil Moisture Remote Sensing Based on Polarization Spectrum].

Song Ye, Dong-feng Deng, Xiao-bing Sun

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |July 13, 2018
    PubMed
    Summary

    Polarimetric detecting technology offers valuable insights for remote sensing of soil moisture. Higher soil moisture correlates with increased polarization in the 500–700 nm band, but this relationship is less clear at lower moisture levels.

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    Area of Science:

    • Remote Sensing
    • Soil Science
    • Optics

    Background:

    • Traditional hyperspectral remote sensing has limitations.
    • Polarimetric detecting technology offers supplementary information.
    • Soil moisture influences surface reflecting light polarization.

    Purpose of the Study:

    • To apply the polarization spectral method for soil moisture measurement.
    • To analyze the correlation between soil moisture and polarization spectrum.
    • To investigate the influence of viewing angles on polarization characteristics.

    Main Methods:

    • Utilized a spectropolarimeter to measure polarized reflectance spectra of soils with varying moisture content.
    • Analyzed the correlation between soil moisture and spectral polarization.
    • Conducted experiments to survey polarization characteristics at different viewing angles.

    Main Results:

    • A direct proportionality was observed between soil moisture and the degree of polarization in the 500–700 nm band under higher moisture conditions.
    • The correlation between polarization spectrum and soil moisture was less evident under low moisture conditions.
    • Polarization spectra are influenced by viewing angles; degree of polarization increases with viewing angle and changes more significantly with soil moisture at wider angles.

    Conclusions:

    • Polarimetric detecting technology shows potential for remote sensing of soil moisture.
    • The 500–700 nm band is particularly sensitive to soil moisture variations at higher moisture levels.
    • Viewing angle is a critical factor influencing the accuracy of polarimetric soil moisture measurements.