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

Content Provider	Springer Nature Link
Author	Ren, Lin Yang, Jingsong Zheng, Gang Wang, Juan
Copyright Year	2015
Abstract	This paper proposes two simple models, look-up table (LUT) model and empirical model, to directly retrieve significant wave height (H $_{s}$) using synthetic aperture radar (SAR) azimuth cutoff (λ $_{c}$). Both models aim at C-band VV, HH, VH, and HV single-polarization SAR images. The LUT model relates H $_{s}$ to λ $_{c}$, while the empirical model relates H $_{s}$ to both λ $_{c}$ and SAR range-to-velocity (β). The LUT model coefficients are derived by simulation under different sea states and observation conditions, which depend on incidence angle (θ), wave direction (d $_{w}$), and β but are independent of polarization. The empirical model coefficients are obtained by fitting the collocated data, which only depend on polarization. To fit empirical model coefficients and validate the two models, C-band RADARSAT-2 fine quad-polarization (VV+HH+VH+HV) single-look complex (SLC) SAR images and collocated buoy data are collected. Retrieved H $_{s}$, using Yang model and the two models proposed in this paper from four kinds of polarization SAR data, are compared with buoy H $_{s}$. Results show that both LUT and empirical models have the capacity of retrieving H $_{s}$ from C-band RADARSAT-2 co-polarization SAR data, while Yang model is not suitable for these kinds of SAR data. Moreover, the empirical model is also valid for cross-polarization SAR data showing clear ocean wave stripes.
Starting Page	93
Ending Page	101
Page Count	9
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	34
Issue Number	12
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2015-11-18
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	SAR single-polarization significant wave height azimuth cutoff Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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