The Influence of Different Spatial Resolutions on the Retrieval Accuracy of Sea Surface Wind Speed With C-2PO Models Using Full Polarization C-Band SAR

This paper presents a comparison strategy for investigating the influence of spatial resolutions on sea surface wind speed retrieval accuracy with cross-polarized synthetic aperture radar images. First, for wind speeds retrieved from vertical transmitting-vertical receiving (VV)-polarized images, th...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2017-09, Vol.55 (9), p.5015-5025
Main Authors: Kangyu Zhang, Xiazhen Xu, Bing Han, Mansaray, Lamin R., Qiaoying Guo, Jingfeng Huang
Format: Article
Language:English
Subjects:
Accuracy
C band
Cross polarization
Geophysics
Image transmission
Meteorological satellites
ocean surface wind
Polarization
Radar imaging
Retrieval
SAR (radar)
Sea measurements
Sea surface
Spatial discrimination
Spatial resolution
Surface wind
Synthetic aperture radar
synthetic aperture radar (SAR)
Temperature (air-sea)
Vertical polarization
Wind speed
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Summary:This paper presents a comparison strategy for investigating the influence of spatial resolutions on sea surface wind speed retrieval accuracy with cross-polarized synthetic aperture radar images. First, for wind speeds retrieved from vertical transmitting-vertical receiving (VV)-polarized images, the optimal geophysical C-band model (CMOD) function was selected among four CMOD functions. Second, the most suitable C-band cross-polarized ocean (C-2PO) model was selected between two C-2POs for the VH-polarized image data set. Then, the VH-wind speeds retrieved by the selected C-2PO were compared with the VV-polarized sea surface wind speeds retrieved using the optimal CMOD, which served as a reference, at different spatial resolutions. Results show that the VH-polarized wind speed retrieval accuracy increases rapidly with the decrease in spatial resolutions from 100 to 1000 m, with a drop in root-mean-square error of 42%. However, the improvement in wind speed retrieval accuracy levels off with spatial resolutions decreasing from 1000 to 5000 m. This demonstrates that the pixel spacing of 1 km may be the compromising choice for the tradeoff between the spatial resolution and wind speed retrieval accuracy with cross-polarized images obtained from RADASAT-2 fine quad-polarization mode.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2017.2700942