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Remote sensing of complex permittivity and penetration depth of soils using P-band SAR polarimetry

Fluhrer, Anke and Jagdhuber, Thomas and Tabatabaeenejad, Alireza and Alemohammad, Hamed and Montzka, Carsten and Friedl, Peter and Foorotan, Ehsan and Kunstmann, Harald (2022) Remote sensing of complex permittivity and penetration depth of soils using P-band SAR polarimetry. Remote Sensing, 14 (12). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs14122755. ISSN 2072-4292.

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Official URL: https://www.mdpi.com/2072-4292/14/12/2755

Abstract

A P-band SAR moisture estimation method is introduced for complex soil permittivity and penetration depth estimation using fully polarimetric P-band SAR signals. This method combines eigen- and model-based decomposition techniques for separation of the total backscattering signal into three scattering components (soil, dihedral, and volume). The incorporation of a soil scattering model allows for the first time the estimation of complex soil permittivity and permittivity-based penetration depth. The proposed method needs no prior assumptions on land cover characteristics and is applicable to a variety of vegetation types. The technique is demonstrated for airborne P-band SAR measurements acquired during the AirMOSS campaign (2012-2015). The estimated complex permittivity agrees well with climate and soil conditions at different monitoring sites. Based on frequency and permittivity, P-band penetration depths vary from 5 cm to 35 cm. This value range is in accordance with previous studies in the literature. Comparison of the results is challenging due to the sparsity of vertical soil in situ sampling. It was found that the disagreement between in situ measurements and SAR-based estimates originates from the discrepancy between the in situ measuring depth of the top-soil layer (0-5 cm) and the median penetration depth of the P-band waves (24.5-27 cm).

Item URL in elib:https://elib.dlr.de/185691/
Document Type:Article
Title:Remote sensing of complex permittivity and penetration depth of soils using P-band SAR polarimetry
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Fluhrer, AnkeAnke.Fluhrer (at) dlr.dehttps://orcid.org/0000-0002-1188-5313
Jagdhuber, ThomasThomas.Jagdhuber (at) dlr.dehttps://orcid.org/0000-0002-1760-2425
Tabatabaeenejad, AlirezaThe Aerospace CorporationUNSPECIFIED
Alemohammad, HamedRadiant Earth FoundationUNSPECIFIED
Montzka, CarstenFZ JülichUNSPECIFIED
Friedl, PeterPeter.Friedl (at) dlr.deUNSPECIFIED
Foorotan, EhsanGeodesy Group, Department of Planning, Aalborg UniversityUNSPECIFIED
Kunstmann, HaraldKITUNSPECIFIED
Date:8 June 2022
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI:10.3390/rs14122755
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:MPDI Remote Sensing
ISSN:2072-4292
Status:Published
Keywords:AirMOSS, Polarimetric decomposition, Soil moisture, Multi-layer SPM
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 - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
German Remote Sensing Data Center > International Ground Segment
Deposited By: Fluhrer, Anke
Deposited On:17 Mar 2022 09:45
Last Modified:09 Nov 2022 08:55

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