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Derivation of Sea Surface Tidal Current From Spaceborne SAR Constellation Data

Ren, YongZheng and Li, Xiao-Ming and Gao, GuoPing and Busche, Thomas Edmund (2017) Derivation of Sea Surface Tidal Current From Spaceborne SAR Constellation Data. IEEE Transactions on Geoscience and Remote Sensing, 55 (6), pp. 3236-3247. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2017.2666086. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/document/7867786/?part=1


In this paper, we demonstrate an application of spaceborne synthetic aperture radar (SAR) constellation data to derive sea surface tidal current at high spatial resolution. The maximum cross correlation (MCC) method, which has been widely applied to optical remote sensing data to derive sea surface velocities, is applied to X-band SAR data from TerraSAR-X (TSX) and TanDEM-X (TDX), which were operating in pursuit monostatic mode. Because of the short temporal interval of TSX and TDX's pursuit acquisitions, temporal de-correlation is minimized to derive tidal current fields that exhibit significant temporal and spatial variations. In addition, we combined data from TDX and another X-band SAR, COSMO-SkyMed, to obtain a virtual SAR constellation data pair, which was also analyzed using the MCC method to derive the tidal current field. Case studies of Hangzhou Bay in the East China Sea and Amrum Island in the North Sea are presented. The SAR-derived tidal current fields were compared to the results of numerical model simulations, high-frequency (HF) radar measurements and in situ measurements. MCC coefficients that are greater than 0.8 are an appropriate threshold for the further derivation of tidal currents. Comparisons to finite volume community ocean model, HF radar and general estuarine transport model results yield root-mean-square errors of 0.13, 0.06, and 0.05 m/s, respectively. Measurements from three field stations were also compared to the MCC SAR retrievals, yielding differences of 0.3, 0.07, and -0.09 m/s.

Item URL in elib:https://elib.dlr.de/117317/
Document Type:Article
Title:Derivation of Sea Surface Tidal Current From Spaceborne SAR Constellation Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ren, YongZhengInstitute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIEDUNSPECIFIED
Li, Xiao-MingInstitute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, ChinaUNSPECIFIEDUNSPECIFIED
Date:1 March 2017
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 3236-3247
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Tidal current, Synthetic Aperture Radar
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 - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Busche, Thomas Edmund
Deposited On:13 Dec 2017 17:16
Last Modified:31 Jul 2019 20:14

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