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Antarctic snow-covered sea ice topography derivation from TanDEM-X using polarimetric SAR interferometry

Huang, Lanqing and Fischer, Georg and Hajnsek, Irena (2021) Antarctic snow-covered sea ice topography derivation from TanDEM-X using polarimetric SAR interferometry. The Cryosphere, 15 (12), pp. 5323-5344. Copernicus Publications. doi: 10.5194/tc-15-5323-2021. ISSN 1994-0416.

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Official URL: https://tc.copernicus.org/articles/15/5323/2021/tc-15-5323-2021-discussion.html


Single-pass interferometric synthetic aperture radar (InSAR) enables the possibility for sea ice topographic retrieval despite the inherent dynamics of sea ice. InSAR digital elevation models (DEMs) are measuring the radar scattering center height. The height bias induced by the penetration of electromagnetic waves into snow and ice leads to inaccuracies of the InSAR DEM, especially for thick and deformed sea ice with snow cover. In this study, an elevation difference between the satellite-measured InSAR DEM and the airborne-measured optical DEM is observed from a coordinated campaign over the western Weddell Sea in Antarctica. The objective is to correct the penetration bias and generate a precise sea ice topographic map from the single-pass InSAR data. With the potential of retrieving sea ice geophysical information by the polarimetric-interferometry (Pol-InSAR) technique, a two-layer-plus-volume model is proposed to represent the sea ice vertical structure and its scattering mechanisms. Furthermore, a simplified version of the model is derived, to allow its inversion with limited a priori knowledge, which is then applied to a topographic retrieval scheme. The experiments are performed across four polarizations: HH, VV, Pauli 1 (HH + VV), and Pauli 2 (HH − VV). The model-retrieved performance is validated with the optically derived DEM of the sea ice topography, showing an excellent performance with root-mean-square error as low as 0.26 m in Pauli-1 (HH + VV) polarization.

Item URL in elib:https://elib.dlr.de/148631/
Document Type:Article
Title:Antarctic snow-covered sea ice topography derivation from TanDEM-X using polarimetric SAR interferometry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Fischer, GeorgUNSPECIFIEDhttps://orcid.org/0000-0002-7987-5453UNSPECIFIED
Date:2 December 2021
Journal or Publication Title:The Cryosphere
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 5323-5344
Publisher:Copernicus Publications
Keywords:snow-covered sea ice topography, TanDEM-X, polarimetric 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 - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:03 Feb 2022 08:36
Last Modified:30 Dec 2022 17:56

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