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Sensors 2008, 8(7), 4213-4248; doi:10.3390/s8074213
Review

On the Soil Roughness Parameterization Problem in Soil Moisture Retrieval of Bare Surfaces from Synthetic Aperture Radar

1,* , 1
, 2
, 3
, 4
 and 5
Received: 22 May 2008; in revised form: 30 May 2008 / Accepted: 25 June 2008 / Published: 15 July 2008
(This article belongs to the Special Issue Synthetic Aperture Radar (SAR))
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Abstract: Synthetic Aperture Radar has shown its large potential for retrieving soil moisture maps at regional scales. However, since the backscattered signal is determined by several surface characteristics, the retrieval of soil moisture is an ill-posed problem when using single configuration imagery. Unless accurate surface roughness parameter values are available, retrieving soil moisture from radar backscatter usually provides inaccurate estimates. The characterization of soil roughness is not fully understood, and a large range of roughness parameter values can be obtained for the same surface when different measurement methodologies are used. In this paper, a literature review is made that summarizes the problems encountered when parameterizing soil roughness as well as the reported impact of the errors made on the retrieved soil moisture. A number of suggestions were made for resolving issues in roughness parameterization and studying the impact of these roughness problems on the soil moisture retrieval accuracy and scale.
Keywords: Soil roughness; Soil moisture retrieval; Synthetic Aperture Radar; Uncertainty. Soil roughness; Soil moisture retrieval; Synthetic Aperture Radar; Uncertainty.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Verhoest, N.E.; Lievens, H.; Wagner, W.; Álvarez-Mozos, J.; Moran, M.S.; Mattia, F. On the Soil Roughness Parameterization Problem in Soil Moisture Retrieval of Bare Surfaces from Synthetic Aperture Radar. Sensors 2008, 8, 4213-4248.

AMA Style

Verhoest NE, Lievens H, Wagner W, Álvarez-Mozos J, Moran MS, Mattia F. On the Soil Roughness Parameterization Problem in Soil Moisture Retrieval of Bare Surfaces from Synthetic Aperture Radar. Sensors. 2008; 8(7):4213-4248.

Chicago/Turabian Style

Verhoest, Niko E.; Lievens, Hans; Wagner, Wolfgang; Álvarez-Mozos, Jesús; Moran, M. S.; Mattia, Francesco. 2008. "On the Soil Roughness Parameterization Problem in Soil Moisture Retrieval of Bare Surfaces from Synthetic Aperture Radar." Sensors 8, no. 7: 4213-4248.


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