Impact of random and periodic surface roughness on P- and L-band radiometry

Shen, Xiaoji; Walker, Jeffrey P.; Ye, Nan; Wu, Xiaoling; Brakhasi, Foad; Boopathi, Nithyapriya; Zhu, Liujun; Yeo, In‐Young; Kim, Edward; Kerr, Yann H.; Jackson, Thomas J.

doi:10.1016/j.rse.2021.112825

Cited by 13 publications

(3 citation statements)

References 55 publications

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“…The calibration accuracy of both PPMR and PLMR was found to be less than 1.5 K. Weekly measurements of near-surface soil moisture (top 5 cm) were taken by a Hydra-probe Data Acquisition System (HDAS; [28]) throughout the quadrants to confirm the representativeness of the station. For a detailed description of the experiment and comprehensive information about the dataset, readers are referred to the publications authored by Shen [11], [15] and the PRISM (P-band Radiometer Inferred Soil Moisture) project website (www.prism.monash.edu).…”

Section: Datamentioning

confidence: 99%

“…L-band microwave remote sensing is only able to detect soil moisture down to around 5 cm below the surface, and is affected by vegetation and surface roughness, leading to a shallower sensing depth and degraded retrieval precision when compared to longer wavelengths [10], [11], [12]. However, a complete understanding of many environmental applications requires information on the moisture in deeper layers of the soil.…”

Section: Introductionmentioning

confidence: 99%

“…To address this need, remote sensing technologies operating at lower frequencies such as P-band (∼40-cm wavelength) have been developed [14]. In addition to providing information about the moisture content distribution in a deeper layer of soil [15], microwave signals at P-band may be better suited for soil moisture retrieval under densely vegetated and topographically complex environments, due to its reduced sensitivity to vegetation [16] and surface roughness [11].…”

Section: Introductionmentioning

confidence: 99%

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A Comparison of Passive Microwave Emission Models for Estimating Brightness Temperature at L- and P-Bands Under Bare and Vegetated Soil Conditions

Brakhasi,

Walker,

Judge

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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P-band radiometry has been demonstrated to have a deeper sensing depth than L-band, making the consideration of multilayer microwave interactions necessary. In addition, the scattering and phase interference effects are different at the Pband, requiring a reconsideration of the need for coherent models. However, the impact remains to be clarified, and understanding the validity and limitations of these models at both L-and P-bands is crucial for their refinement and application. Therefore, two general categories of microwave emission models, including two stratified coherent models (Njoku and Wilhite) and four incoherent models (conventional tau-omega model and three multilayer models being zero-order, first-order, and incoherent solution), were intercompared for the first time on the same dataset. This evaluation utilized observations of L-and P-bands radiometry under different land cover conditions from a tower-based experiment in Victoria,

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Section: Datamentioning

confidence: 99%