A curvelet-based method to determine wave directions from nautical X-band radar images

ZHA Guozhen; HE Qingyou; GUAN Changlong; CHEN Jitao

doi:10.1007/s13131-018-1154-z

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(1): 11-19

ZHA Guozhen, HE Qingyou, GUAN Changlong, CHEN Jitao. A curvelet-based method to determine wave directions from nautical X-band radar images[J]. Acta Oceanologica Sinica, 2018, 37(1): 11-19. doi: 10.1007/s13131-018-1154-z

Citation:

ZHA Guozhen, HE Qingyou, GUAN Changlong, CHEN Jitao. A curvelet-based method to determine wave directions from nautical X-band radar images[J]. Acta Oceanologica Sinica, 2018, 37(1): 11-19. doi: 10.1007/s13131-018-1154-z

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A curvelet-based method to determine wave directions from nautical X-band radar images

doi: 10.1007/s13131-018-1154-z

1.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China
3.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
4.
Hydrology Bureau of Yellow River Conservancy Commission, Zhengzhou 450004, China

Received Date: 2017-08-10

Abstract

Abstract

A new method to determine wave directions from nautical X-band images is proposed. The signatures of ocean waves show obvious scale and directional characteristics in nautical X-band radar images. Curvelet transform (CT) possesses very high scale and directional sensitivities. Therefore, it has good capability to analyze ocean wave fields. The radar images are decomposed at different scales, in different directions, and at different positions by CT, and curvelet coefficients are obtained. Given to the scale and directional characteristics of surface waves, the information of ocean waves is centralized in the curvelet coefficients of certain directions and at certain scales. Therefore, the wave orientations can be determined. The 180 ambiguity is removed by calculating cross-correlation coefficients (CCCs) between continuous collected images. The proposed method is verified by the dataset collected on the Northwest coast of the Zhangzi Island in the Yellow Sea of China from March to April 2009.
- X-band radar,
- wave direction,
- surface wave,
- curvelet transform

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