NDLI: Soil moisture retrieval using L-band radiometer and ground-penetrating radar

Content Provider	IEEE Xplore Digital Library
Author	Jonard, F. Weihermuller, L. Schwank, M. Vereecken, H. Lambot, S.
Copyright Year	2011
Description	Author affiliation: Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, 52425, Germany (Jonard, F.; Weihermuller, L.; Schwank, M.; Vereecken, H.; Lambot, S.)
Abstract	The objective of this study was to evaluate two remote-sensing methods for mapping the surface soil moisture of a bare soil, namely L-band radiometry using brightness temperature and 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 controlled heterogeneous irrigation that ensured a wide range of water content. The heterogeneous irrigation pattern was reasonably well reproduced by both remote-sensing techniques. 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. For the radiometer, the effect of roughness was accounted for using an empirical model that required calibration with the reference TDR measurements. The root mean square (RMS) error between soil moisture measured by GPR and TDR was 0.038 $m^{3}$ $m^{−3}$ while the RMS error between radiometer (horizontal and vertical polarizations)- and TDR-derived soil water content was 0.020 $m^{3}$ $m^{−3}.$ These results suggest that both remote-sensing techniques are promising for field-scale mapping of surface soil moisture over bare soils.
Starting Page	3093
Ending Page	3096
File Size	845375
Page Count	4
File Format	PDF
ISBN	9781457710032
ISSN	21537003
e-ISBN	9781457710056
DOI	10.1109/IGARSS.2011.6049872
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-24
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microwave radiometry Ground penetrating radar Soil measurements Remote sensing Soil moisture L-band surface roughness Active and passive remote sensing GPR L-band radiometer soil water content
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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