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The motivation of this work is to investigate the characteristics of Normalized Radar Cross Section (NRCS) of X-band SAR under high winds using a TerraSAR-X (TS-X) image taken in Typhoon Megi in the South China Sea. NRCS derived from TS-X is compared with the simulated NRCS using the C-band GMF CMOD5 and the Ku-band GMF NSCAT4. The wind velocity is ranged from 25 to 36 m s−1 in the analysis. Results...
In this study, we present the analysis of measurements of normalized radar cross section (NRCS) and the polarisation ratio (PR) in dual-polarisation TerraSAR-X (TS-X) images. Based on two PR functions proposed for C-band SAR (denoted as the Thompson model and Elfouhaily model respectively) and the relationship between NRCS and incidence angle for X-band (it is called X-PR), three PR models are tuned...
Polynyas are persistent openings and/or thin ice in the ice cover. They play an important role in the air-sea interaction. Their accurate detection, including an estimate of shape and area, is therefore important. There is a polynya at the front of the Amery Ice Shelf (AIS). In this paper, a threshold of 70% of AMSR-E sea ice concentrations is selected to define a polynya and to calculate the area...
This paper presents a method of retrieving turbulent heat fluxes, including interfacial sensible heat and latent heat flux, from synthetic aperture radar (SAR) images. In this study, Radarsat2 image data which is taken in south of China, Hainan Island, is used for retrieving wind field by CMOD5 firstly. After retrieving wind field, a bulk aerodynamic method of calculating the friction velocity and...
As we known, CMOD models were developed for C-band VV-polarized SAR images, and when CMOD family models are applicable for HH-polarized SAR images such as Radarsat2 images it is necessary to convert normalized radar cross section (NRCS) (HH-polarized) to NRCS (VV-polarized) by the HH-to-VV polarisation model. In this study, we discussed different HH-to-VV polarisation models' performance in retrieving...
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