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Toward P-band passive microwave sensing of soil moisture

Citation

Ye, N and Walker, JP and Yeo, IY and Jackson, TJ and Kerr, Y and Kim, E and McGrath, A and Popstefanija, I and Goodberlet, M and Hills, J, Toward P-band passive microwave sensing of soil moisture, IEEE Geoscience and Remote Sensing Letters, 18, (3) pp. 504-508. ISSN 1545-598X (2021) [Refereed Article]

Copyright Statement

2020 IEEE

DOI: doi:10.1109/LGRS.2020.2976204

Abstract

Currently, near-surface soil moisture at a global scale is being provided using National Aeronautics and Space Administration's (NASA's) Soil Moisture Active Passive (SMAP) and European Space Agency's (ESA's) Soil Moisture and Ocean Salinity (SMOS) satellites, both of which utilize L-band (1.4 GHz; 21 cm wavelength) passive microwave remote sensing techniques. However, a fundamental limitation of this technology is that the water content can only be measured for approximately the top 5-cm layer of soil moisture, and only over low-to-moderate vegetation covered areas in order to meet the 0.04 text{m}{3}/text{m}{3} target accuracy, limiting its applicability. Consequently, a longer wavelength radiometer is being explored as a potential solution for measuring soil moisture in a deeper surface layer of soil and under denser vegetation. It is expected that P-band (wavelength of 40 cm and frequency of 750 MHz) could potentially provide soil moisture information for the top sim 10 -cm layer of soil, being one-tenth to one-quarter of the wavelength. In addition, P-band is expected to have higher soil moisture retrieval accuracy due to its reduced sensitivity to vegetation water content and surface roughness. To demonstrate the potential of P-band passive microwave soil moisture remote sensing, a short-term airborne field experiment was conducted over a center pivot irrigated farm at Cressy in Tasmania, Australia, in January 2017. First results showing a comparison of airborne P-band brightness temperature observations against airborne L-band brightness temperature observations and ground soil moisture measurements are presented. The P-band brightness temperature was found to have a similar but stronger response to soil moisture compared to L-band.

Item Details

Item Type:Refereed Article
Keywords:airborne field experiments, brightness temperature, L-band, P-band, soil moisture
Research Division:Engineering
Research Group:Electronics, sensors and digital hardware
Research Field:Electronics, sensors and digital hardware not elsewhere classified
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Soils
UTAS Author:Hills, J (Dr James Hills)
ID Code:152243
Year Published:2021
Web of Science® Times Cited:6
Deposited By:Engineering
Deposited On:2022-08-15
Last Modified:2022-09-07
Downloads:0

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