Significant wave height estimation using azimuth cutoff of C-band RADARSAT-2 single-polarization SAR images

Ren, Lin; Yang, Jingsong; Zheng, Gang; Wang, Juan

doi:10.1007/s13131-015-0769-6

Cited by 36 publications

(35 citation statements)

References 19 publications

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“…In addition, the directionality dependency of the swh ∼ λ c /β relationship has been proven by simulations [26,28]. Therefore, it is evident that azimuth cut-off λ c is related to SWH with the dependency of peak wave direction ϕ and wavelength, as well as radar incidence angle.…”

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 76%

“…2018, 10, 363 9 of 23 WM configuration. In fact, the incidence angle is an important parameter that should be taken into consideration to build such empirical models [25,26,28]. With respect to Sentinel-1 A, whose WM configuration has two fixed incidence angles, CWAVE_S1A and CWAVE_Fnn [23] were developed for each of the two incidence beams respectively.…”

Section: Radar Incidence Anglementioning

confidence: 99%

“…This cut-off effect suppresses the spectral information provided by the SAR on short to moderate wavelength waves with components of propagation in the azimuth direction. However, it has been found that SAR azimuth cut-off could provide additional information on sea state [50], and is applied to some empirical SWH retrieval algorithms, e.g., [23,24,26,28].…”

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 99%

“…Therefore, it is evident that azimuth cut-off λ c is related to SWH with the dependency of peak wave direction ϕ and wavelength, as well as radar incidence angle. Thus, considering this complicated relationship, in contrast to the relative simple linear models e.g., [26,28], we include azimuth cut-off λ c , peak wavelength λ p , and direction ϕ into our QPCWAVE_GF3 model, and take their interactions into account as well.…”

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 99%

“…Accordingly, the SWH retrieval algorithm QPCWAVE_GF3 proposed here includes the cross-polarized NRCS, which have been not taken into account for the empirical models dedicated to single polarization SAR data i.e., [19,20,23], or even Radarsat-2 SAR images with quad-polarization [28]. Therefore, it is interesting to discuss the contribution of cross-polarized NRCS to our proposed empirical SWH retrieval algorithm.…”

Section: Cross-polarized Nrcs Contribution To Swh Empirical Modelmentioning

confidence: 99%

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Empirical Algorithm for Significant Wave Height Retrieval from Wave Mode Data Provided by the Chinese Satellite Gaofen-3

Wang¹,

Wang

Yang

et al. 2018

Remote Sensing

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Gaofen-3 (GF-3), the first Chinese civil C-band synthetic aperture radar (SAR), was successfully launched by the China Academy of Space Technology on 10 August 2016. Among its 12 imaging modes, wave mode is designed to monitor the ocean surface waves over the open ocean. An empirical retrieval algorithm of significant wave height (SWH), termed Quad-Polarized C-band WAVE algorithm for GF-3 wave mode (QPCWAVE_GF3), is developed for quad-polarized SAR measurements from GF-3 in wave mode. QPCWAVE_GF3 model is built using six SAR image and spectrum related parameters. Based on a total of 2576 WaveWatch III (WW3) and GF-3 wave mode match-ups, 12 empirical coefficients of the model are determined for 6 incidence angle modes. The validation of the QPCWAVE_GF3 model is performed through comparisons against independent WW3 modelling hindcasts, and observations from altimeters and buoys from January to October in 2017. The assessment shows a good agreement with root mean square error from 0.5 m to 0.6 m, and scatter index around 20%. In particular, applications of the QPCWAVE_GF3 model in SWH estimation for two storm cases from GF-3 data in wave mode and Quad-Polarization Strip I mode are presented respectively. Results indicate that the proposed algorithm is suitable for SWH estimation from GF-3 wave mode and is promising for other similar data.

show abstract

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 76%

Section: Radar Incidence Anglementioning

confidence: 99%

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 99%

Section: Azimuth Cut-off Peak Wavelength and Directionmentioning

confidence: 99%

Section: Cross-polarized Nrcs Contribution To Swh Empirical Modelmentioning

confidence: 99%

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Empirical Algorithm for Significant Wave Height Retrieval from Wave Mode Data Provided by the Chinese Satellite Gaofen-3

Wang¹,

Wang

Yang

et al. 2018

Remote Sensing

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show abstract

Azimuthal Ocean Wave Emerged in SAR Image Spectra Under Specific Condition

Yoshida

2017

JGR Oceans

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Velocity bunching causes nonlinear modulations in synthetic aperture radar (SAR) images of oceanic scenes. SAR images for the azimuth waves exhibit destructive wavy patterns because of azimuthal distortion caused by velocity bunching. Meanwhile, velocity bunching creates constructive wavy patterns for long waves in certain cases. This paper aims to provide a simple indication for practical interpretation of plausible wavy patterns. A numerical simulation had been performed to address how velocity bunching forms a clear wave‐like pattern caused by orbital motions of a long single swell under a certain condition. More specifically, when the azimuth shifts caused by the orbital motions of the azimuth wave concentrate in the wave trough or crest, the bunching causes a strong single peak in the SAR images. This paper explains the mechanism of displaying plausible wavy patterns from the viewpoint of the ocean wave spectra and this specific condition. First, the simulation was validated for irregular waves generated from ocean wave spectra matching actual buoy data from which SAR images were simultaneously obtained. The SAR image spectra showed longer waves than those of the ocean wave spectra estimated via buoy data. The simulated spectra exhibited a similar trend to the actual SAR image, thus validating the numerical simulation. Next, an additional numerical simulation was conducted for irregular waves under the specific condition. The simulated results suggest that if a significant wave height and wavelength match the specific condition, the long waves in SAR image spectra can be similar to the original ocean wave spectra.

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Wave Azimuth Cutoff Compensation Method and the Multisatellite Networking Mode of SAR

Wan,

Cui,

et al. 2023

J. Ocean Univ. China

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Significant wave height estimation using azimuth cutoff of C-band RADARSAT-2 single-polarization SAR images

Cited by 36 publications

References 19 publications

Empirical Algorithm for Significant Wave Height Retrieval from Wave Mode Data Provided by the Chinese Satellite Gaofen-3

Empirical Algorithm for Significant Wave Height Retrieval from Wave Mode Data Provided by the Chinese Satellite Gaofen-3

Azimuthal Ocean Wave Emerged in SAR Image Spectra Under Specific Condition

Wave Azimuth Cutoff Compensation Method and the Multisatellite Networking Mode of SAR

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