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Synergy and fusion of optical and synthetic aperture radar satellite data for underwater topography estimation in coastal areas

Pleskachevsky, Andrey und Lehner, Susanne und Heege, Thomas und Mott, Claudius (2011) Synergy and fusion of optical and synthetic aperture radar satellite data for underwater topography estimation in coastal areas. Ocean Dynamics, 61 (12), Seiten 2099-2120. Springer. DOI: 10.1007/s10236-011-0460-1 .

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Kurzfassung

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 1 m 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 20 m 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 20 m up to 10 m 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 TerraSAR-X 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 150 m, which corresponds to an average swell wavelength observed in the 10 × 10-km SAR image acquired. The second mesh has a resolution of 150 m for depths up to 20 m (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.

Dokumentart:Zeitschriftenbeitrag
Titel:Synergy and fusion of optical and synthetic aperture radar satellite data for underwater topography estimation in coastal areas
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Pleskachevsky, AndreyNICHT SPEZIFIZIERT
Lehner, SusanneNICHT SPEZIFIZIERT
Heege, ThomasEOMAP
Mott, ClaudiusEOMAP
Datum:Dezember 2011
Erschienen in:Ocean Dynamics
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:61
DOI :10.1007/s10236-011-0460-1
Seitenbereich:Seiten 2099-2120
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
NICHT SPEZIFIZIERTSpringer
Verlag:Springer
Name der Reihe:Ocean Dynamics
Status:veröffentlicht
Stichwörter:SAR – TerraSAR-X – QuickBird optical images – Underwater topography
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Gewässerfernerkundung
Hinterlegt von: Bärbel Bolowski
Hinterlegt am:01 Dez 2011 15:31
Letzte Änderung:26 Mär 2013 13:34

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