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Vegetation and soil moisture inversion from SAR closure phases: First experiments and results

De Zan, Francesco and Gomba, Giorgio (2018) Vegetation and soil moisture inversion from SAR closure phases: First experiments and results. Remote Sensing of Environment, 217, pp. 562-572. Elsevier. doi: 10.1016/j.rse.2018.08.034. ISSN 0034-4257.

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Official URL: https://doi.org/10.1016/j.rse.2018.08.034


The inversion of soil moisture from Synthetic Aperture Radar (SAR) closure phases is intrinsically plagued by ambiguities that affect the moisture order. This work shows a characterization of the ambiguities and a way to solve for them with the help of interferometric coherence. This allows to properly constrain the inversion and to retrieve the moisture signal. A data set of ALOS-2/PALSAR-2 L-band images is used as an example of successful inversion at the scene level, with sub-kilometer resolution. The results are validated with soil moisture products based on ASCAT and show a high degree of correlation. The raw moisture derived by the algorithm could be immediately used to correct SAR interferometric phases; however, for pplications that need absolute moisture levels, a calibration step is likely necessary. Unexpectedly, a good performance was observed over forested areas, which suggests a sensitivity of closure phases to tree moisture; at the same time, over pastures and agricultural fields the closure phase signal was found relatively weak. Additional research is needed to evaluate the ap- plicability of the same measurements principle to shorter wavelengths and exploitation of potential synergies with backscatter and polarimetric information.

Item URL in elib:https://elib.dlr.de/121676/
Document Type:Article
Title:Vegetation and soil moisture inversion from SAR closure phases: First experiments and results
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
De Zan, Francescofrancesco.dezan (at) dlr.dehttps://orcid.org/0000-0002-1643-2559
Gomba, Giorgiogiorgio.gomba (at) dlr.deUNSPECIFIED
Date:November 2018
Journal or Publication Title:Remote Sensing of Environment
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.rse.2018.08.034
Page Range:pp. 562-572
Keywords:Soil moisture, Closure phase, SAR interferometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: De Zan, Francesco
Deposited On:14 Sep 2018 10:29
Last Modified:31 Jul 2019 20:19

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