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Remote Sens. 2015, 7(10), 12815-12828; doi:10.3390/rs71012815

Ocean Wave Parameters Retrieval from TerraSAR-X Images Validated against Buoy Measurements and Model Results

1
Marine Acoustics and Remote Sensing Laboratory, Zhejiang Ocean University, Zhoushan 316000, China
2
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of State Oceanic Administration, Hangzhou 310000, China
3
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
4
GST, National Environmental Satellite, Data, and Information Service (NESDIS), National Oceanic and Atmospheric Administration (NOAA), College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Raphael M. Kudela and Prasad S. Thenkabail
Received: 23 June 2015 / Revised: 23 September 2015 / Accepted: 24 September 2015 / Published: 30 September 2015
View Full-Text   |   Download PDF [3984 KB, uploaded 30 September 2015]   |  

Abstract

An ocean surface wave retrieval algorithm, Parameterized First-guess Spectrum Method (PFSM), which was initially developed for C-band Synthetic Aperture Radar (SAR), is modified to extract wave parameters from X-band TerraSAR-X (TS-X) images. Wave parameters, including significant wave height (SWH) and mean wave period (MWP) were extracted from nine TS-X HH-polarization images and were compared to in situ buoy measurements. The range of these wave retrievals is from 1 to 5 m of SWH and from 2 to 10 s of MWP. The retrieval accuracy could reach 80%. After that, a total of 16 collected TS-X HH-polarization images were used to invert wave parameters and then the retrieval results were compared to the operational WAVEWATCH-III wave model results. The SAR and in situ buoy wave comparison shows a 0.26 m Root-Mean-Square Error (RMSE) of SWH and a 19.8% of Scatter Index (SI). The SAR and WAVEWATCH-III model comparison yields slightly worse results with an RMSE of 0.43 m of SWH and a 32.8% of SI. For MWP, the SAR and buoy comparison shows the RMSE is 0.45 s with an SI of 26%, which is better than the results from the SAR and WAVEWATCH-III model comparison. Our results show that the PFSM algorithm is suitable to estimate wave parameters from X-band TS-X data. View Full-Text
Keywords: TerraSAR-X; wave spectrum; significant wave height; mean wave period TerraSAR-X; wave spectrum; significant wave height; mean wave period
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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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MDPI and ACS Style

Shao, W.; Li, X.; Sun, J. Ocean Wave Parameters Retrieval from TerraSAR-X Images Validated against Buoy Measurements and Model Results. Remote Sens. 2015, 7, 12815-12828.

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