On the soil roughness parameterization problem in soil moisture retrieval of bare surfaces from synthetic aperture radar
Verhoest, Niko E. C.
Álvarez Mozos, Jesús
Moran, M. Susan
Acceso abierto / Sarbide irekiainfo:eu-repo/semantics/openAccess
Artículo / Artikuluainfo:eu-repo/semantics/article
Versión publicada / Argitaratu den bertsioainfo:eu-repo/semantics/publishedVersion
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 ... [++]
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. [--]
Soil roughness, Soil moisture retrieval, Synthetic aperture radar, Uncertainty, Integral equation model, Microwave backscatter dependence, A priori information, Sar data, C band, Polarimetric sar, Agricultural, Fields, Profile meter, Laser scanner, Wet soil
Sensors, 2008, 8(7). Págs. 4213-4248
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Part of the research presented in this paper, as performed by the first two authors, is funded by the Belgian Science Policy Office in the frame of the Stereo II programme - project SR/00/100.
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