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Open AccessTechnical Note
Remote Sens. 2016, 8(1), 53; doi:10.3390/rs8010053

Derivation of Sea Surface Wind Directions from TerraSAR-X Data Using the Local Gradient Method

1
Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
2
Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 10094, China
3
Hainan Key Laboratory of Earth Observation, Sanya 572029, China
*
Author to whom correspondence should be addressed.
Academic Editors: Xiaofeng Li, Richard Gloaguen and Prasad S. Thenkabail
Received: 31 October 2015 / Revised: 30 December 2015 / Accepted: 6 January 2016 / Published: 8 January 2016
View Full-Text   |   Download PDF [6095 KB, uploaded 8 January 2016]   |  

Abstract

Derivation of sea surface wind direction is a key step of sea surface wind retrieval from spaceborne Synthetic Aperture Radar (SAR) data. This technical note describes an implementation of the Local Gradient (LG) method to derive sea surface wind directions at a scale of a few kilometers from X-band spaceborne SAR TerraSAR-X (TS-X) data in wide swath mode. The 180° ambiguity in the derived sea surface wind direction is automatically eliminated using a single reference wind direction from external data sources. Several typical cases acquired in the North Sea were presented to demonstrate the derivation of sea surface wind direction under different wind situations using this method. The derived sea surface wind direction were further compared to atmospheric model prediction results. In addition, a practical method is introduced to address ambiguity in the derived sea surface wind directions using the LG method in a typhoon case with rotating surface wind structure. By interpolating the derived wind directions at a scale of kilometers, sea surface wind speeds with a spatial resolution of 500 m are subsequently retrieved using the X-band SAR sea surface wind Geophysical Model Function (GMF). The approach accomplished by combining the LG method with the X-band GMF for deriving sea surface wind in high spatial resolution demonstrates its potential for operational service. View Full-Text
Keywords: Synthetic Aperture Radar (SAR); local gradient method; sea surface wind retrieval; TerraSAR-X Synthetic Aperture Radar (SAR); local gradient method; sea surface wind retrieval; TerraSAR-X
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Y.-R.; Li, X.-M. Derivation of Sea Surface Wind Directions from TerraSAR-X Data Using the Local Gradient Method. Remote Sens. 2016, 8, 53.

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