Mapping field scale soil moisture with L-band radiometer and Ground-Penetrating Radar Over Bare Soil

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Title:Main Title: Mapping field scale soil moisture with L-band radiometer and Ground-Penetrating Radar Over Bare Soil
Description:Abstract: Accurate estimates of surface soil moisture are essential in many research fields, including agriculture, hydrology and meteorology. The objective of this study was to evaluate two remote-sensing methods for mapping the soil moisture of a bare soil, namely L-band radiometry using brightness temperature and off-ground ground-penetrating radar (GPR) using surface reflection inversion. Invasive time-domain reflectometry (TDR) measurements were used as a reference. A field experiment was performed in which these three methods were used to map soil moisture after heterogeneous irrigation that ensured a wide range of water content. The heterogeneous irrigation pattern was reasonably well reproduced by both remote-sensing techniques. However, significant differences in the absolute moisture values retrieved were observed. This discrepancy was attributed to different sensing depths and areas, and different sensitivities to soil surface roughness. For GPR, the effect of roughness was excluded by operating at low frequencies (0.2-0.8 GHz) that were not sensitive to the field surface roughness. The root mean square (RMS) error between soil moisture measured by GPR and TDR was 0.038 m3 m¡3. For the radiometer, the RMS error decreased from 0.062 (horizontal polarization) and 0.054 (vertical polarization) to 0.020 m3 m¡3 after accounting for roughness using an empirical model that required calibration with reference TDR measurements. Monte Carlo simulations showed that around 20 % of the reference data were required to obtain a good roughness calibration for the entire field. It was concluded that relatively accurate measurements were possible with both methods, although accounting for surface roughness was essential for radiometry.
Identifier:10.1109/TGRS.2011.2114890 (DOI)
Responsible Party
Creators:Francois Jonard (Author), Lutz Weihermüller (Author), Khan Zaib Jadoon (Author), Mike Schwank (Author), Harry Vereecken (Author), Sebastien Lambot (Author)
Publisher:IEEE
Publication Year:2013
Topic
TR32 Topic:Remote Sensing
Related Subproject:Z3
Subjects:Keywords: Remote Sensing, Digital Soil Mapping, GPR, Microwave Radiometer, Surface Roughness
File Details
Filename:2011_Jonard_GRSL.pdf
Data Type:Text - Article
Size:13 Pages
File Size:1.1 MB
Dates:Accepted: 30.01.2011
Issued: 19.04.2011
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:[TR32DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:IEEE Transaction on Geoscience and remote Sensing
Source Website:www.ieeexplore.ieee.org
Issue:8
Volume:49
Number of Pages:13 (2863 - 2875)
Metadata Details
Metadata Creator:Heye Bogena
Metadata Created:03.12.2013
Metadata Last Updated:03.12.2013
Subproject:Z3
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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