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Modeling InSAR closure phase and soil moisture inversion

De Zan, Francesco and Gomba, Giorgio (2019) Modeling InSAR closure phase and soil moisture inversion. AGU Fall Meeting, 9.-13. Dez. 2019, San Francisco, USA.

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Official URL: https://www.agu.org/fall-meeting

Abstract

Closure phases in SAR interferometry have the potential to carry information about the scatterer and changes in its dielectric properties. We are modeling the effects of scatterer changes on the interferometric phases. In this contribution we present some result and open questions. We start by using the interferometric model in De Zan et al. 2014 to explain the closure phases observed in InSAR with moisture variations and invert them. This model seems to work rather well in L-band and we report inversion results for the CanEX-SM10 campaign by UAVSAR (NASA/JPL) over an agricultural site in Saskatchewan, Canada. Here the field-based correlation between our inversion and moisture probes are higher than 0.7 for most of the fields. The scaling factor between the inversion and the probe signal is, however, highly variable and we do not have a satisfactory model for it yet. We report also encouraging first results with C-band modeling over southern Italy observed with Sentinel-1. The closure phases obey a similar model as for L-band, but they are typically downscaled, i.e. we observed values smaller than the model would predict. There is a possibility that the moisture model is not explaining the totality of the observed closure phase. This idea is suggested also by processing interferometrically stacks of SAR images and limiting the temporal separation to a few months. The retrieved deformation exhibits a spurious drift that amounts to a few millimeters / year. The drift is rather constant and does not seem to be related to the moisture cycles. By adding just a few (3) parameters to the interferometric models it is possible to explain significantly better both the observed closure phases and the drifts when reconstructing a deformation series by limiting the temporal separation.

Item URL in elib:https://elib.dlr.de/133795/
Document Type:Conference or Workshop Item (Speech)
Title:Modeling InSAR closure phase and soil moisture inversion
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
De Zan, Francescofrancesco.dezan (at) dlr.dehttps://orcid.org/0000-0002-1643-2559
Gomba, GiorgioGiorgio.Gomba (at) dlr.deUNSPECIFIED
Date:2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SAR Interferometry, closure phases, moisture, L-band, C-band
Event Title:AGU Fall Meeting
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:9.-13. Dez. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - SAR-Methodology
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: De Zan, Francesco
Deposited On:27 Jan 2020 12:37
Last Modified:27 Jan 2020 12:37

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