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Estimation of Underwater Topography using Satellite High Resolution Synthetic Aperture Radar Data.

Pleskachevsky, Andrey and Lehner, Susanne (2012) Estimation of Underwater Topography using Satellite High Resolution Synthetic Aperture Radar Data. In: Proceedings of SEASAR 2012 (Abstract Book), p. 25. SEASAR 2012, 18. -22. Juni 2012, Tromso, Norway.

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Official URL: http://earth.eo.esa.int/workshops/seasar2012/files/SEASAR2012_Programme&AbstractBook.pdf


A method to obtain underwater topography for coastal areas using state-of-the-art remote sensing data and techniques worldwide is presented. The data from the new Synthetic Aperture Radar (SAR) satellite TerraSAR-X with high resolution up to 1m are used to render the ocean waves. As bathymetry is reflected by long swell wave refraction governed by underwater structures in shallow areas, it can be derived using the dispersion relation from observed swell properties. To complete the bathymetric maps, optical satellite data of the QuickBird satellite are fused to map extreme shallow waters, e.g., in near-coast areas. The algorithms for bathymetry estimation from optical and SAR data are combined and integrated in order to cover different depth domains. Both techniques make use of different physical phenomena and mathematical treatment. The optical methods based on sunlight reflection analysis provide depths in shallow water up to 20m in preferably calm weather conditions. The depth estimation from SAR is based on the observation of long waves and covers the areas between about 70- and 10-m water depths depending on sea state and acquisition quality. The depths in the range of 20m up to 10m represent the domain where the synergy of data from both sources arises. Thus, the results derived from SAR and optical sensors complement each other. In this study, a bathymetry map near Rottnest Island, Australia, is derived. QuickBird satellite optical data and radar data from TerraSARX have been used. The depths estimated are aligned on two different grids. The first one is a uniform rectangular mesh with a horizontal resolution of 150m, which corresponds to an average swell wavelength observed in the 10×10-km SAR image acquired. The second mesh has a resolution of 150m for depths up to 20m (deeper domain covered by SAR based technique) and 2.4 m resolution for the shallow domain imaged by an optical sensor. This new technique provides a platform for mapping of coastal bathymetry over a broad area on a scale that is relevant to marine planners, managers, and offshore industry.

Item URL in elib:https://elib.dlr.de/79361/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Estimation of Underwater Topography using Satellite High Resolution Synthetic Aperture Radar Data.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pleskachevsky, Andreyandrey.pleskachevsky (at) dlr.deUNSPECIFIED
Lehner, Susannesusanne.lehner (at) dlr.deUNSPECIFIED
Date:7 June 2012
Journal or Publication Title:Proceedings of SEASAR 2012 (Abstract Book)
Refereed publication:No
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:No
Page Range:p. 25
EditorsEmailEditor's ORCID iD
Keywords:SAR, Radar Data, Underwater topography
Event Title:SEASAR 2012
Event Location:Tromso, Norway
Event Type:Workshop
Event Dates:18. -22. Juni 2012
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 hochauflösende Fernerkundungsverfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited On:03 Dec 2012 12:57
Last Modified:03 Dec 2012 12:57

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