On the Soil Roughness Parameterization Problem in Soil Moisture Retrieval of Bare Surfaces from Synthetic Aperture Radar
Niko E. C. Verhoest,Hans Lievens,Wolfgang Wagner,Jesús Álvarez-Mozos,M. Susan Moran,F. Mattia +5 more
TLDR
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.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.read more
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Modeling Soil Processes: Review, Key Challenges, and New Perspectives
Harry Vereecken,Andrea Schnepf,Jan W. Hopmans,Mathieu Javaux,Dani Or,Tiina Roose,Jan Vanderborght,Michael H. Young,Wulf Amelung,Matt Aitkenhead,Steven D. Allison,Shmuel Assouline,Philippe C. Baveye,Markus Berli,Nicolas Brüggemann,Peter Finke,Markus Flury,Thomas Gaiser,Gerard Govers,Teamrat A. Ghezzehei,Paul D. Hallett,Harrie-Jan Hendricks Franssen,J. Heppell,Rainer Horn,Johan Alexander Huisman,Diederik Jacques,François Jonard,Stefan Kollet,François Lafolie,Krzysztof Lamorski,Daniel Leitner,Alex B. McBratney,Budiman Minasny,Carsten Montzka,Wolfgang Nowak,Ya. A. Pachepsky,José Padarian,Nunzio Romano,Kurt Roth,Youri Rothfuss,Edwin C. Rowe,Andreas Schwen,Jirka Šimůnek,Aaldrik Tiktak,J.C. van Dam,S.E.A.T.M. van der Zee,Hans-Jörg Vogel,Jasper A. Vrugt,Thomas Wöhling,Iain M. Young +49 more
TL;DR: Key challenges in modeling soil processes are identified, including the systematic incorporation of heterogeneity and uncertainty, the integration of data and models, and strategies for effective integration of knowledge on physical, chemical, and biological soil processes.
Journal ArticleDOI
The ASCAT Soil Moisture Product: A Review of its Specifications, Validation Results, and Emerging Applications
Wolfgang Wagner,Sebastian Hahn,R. Kidd,Thomas Melzer,Zoltan Bartalis,S. Hasenauer,Julia Figa-Saldana,Patricia de Rosnay,Alexander Jann,Stefan Schneider,Jürgen Komma,Gerhard Kubu,Katharina Brugger,Christoph Aubrecht,Johann Züger,Ute Gangkofner,Stefan Kienberger,Luca Brocca,Yong Wang,Günter Blöschl,Josef Eitzinger,Kla Steinnocher +21 more
TL;DR: The Advanced Scatterometer (ASCAT) is a C-band active microwave remote sensing instrument flown on board of the Meteorological Operational (METOP) satellite series as discussed by the authors.
Journal ArticleDOI
On the spatio-temporal dynamics of soil moisture at the field scale
Harry Vereecken,Johan Alexander Huisman,Yakov Pachepsky,Carsten Montzka,J. van der Kruk,Heye Bogena,Lutz Weihermüller,Michael Herbst,Gonzalo Martinez,Jan Vanderborght +9 more
TL;DR: In this paper, the authors review the state of the art of characterizing and analyzing spatio-temporal dynamics of soil moisture content at the field scale and discuss measurement techniques that have become available in recent years and that provide unique opportunities to characterize field scale soil moisture variability with high spatial and temporal resolution.
Journal ArticleDOI
Surface soil moisture retrievals from remote sensing: Current status, products & future trends
TL;DR: It is evident from this review that there is potential for more accurate estimation of SMC exploiting EO technology, particularly so, by exploring the use of synergistic approaches between a variety of EO instruments.
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