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- Title
Sea Surface Wind Retrievals from SIR-C/X-SAR Data: A Revisit.
- Authors
Yongzheng Ren; Xiao-Ming Li; Guoqing Zhou
- Abstract
The Geophysical Model Function (GMF) XMOD1 provides a linear algorithm for sea surface wind field retrievals for the Spaceborne Imaging Radar-C/X-band Synthetic Aperture Radar (SIR-C/X-SAR). However, the relationship between the normalized radar cross section (NRCS) and the sea surface wind speed, wind direction and incidence angles is non-linear. Therefore, in this paper, XMOD1 is revisited using the full dataset of X-SAR acquired over the ocean. We analyze the detailed relationship between the X-SAR NRCS, incidence angle and sea surface wind speed. Based on the C-band GMF CMOD_IFR2, an updated empirical retrieval model of the sea surface wind field called SIRX-MOD is derived. In situ buoy measurements and the scatterometer data of ERS-1/SCAT are used to validate the retrieved sea surface wind speeds from the X-SAR data with SIRX-MOD, which respectively yield biases of 0.13 m/s and 0.16 m/s and root mean square (RMS) errors of 1.83 m/s and 1.63 m/s.
- Subjects
SYNTHETIC aperture radar; WIND speed; OCEAN surface topography; REMOTE sensing; COMPUTER algorithms; STANDARD deviations
- Publication
Remote Sensing, 2015, Vol 7, Issue 4, p3548
- ISSN
2072-4292
- Publication type
Article
- DOI
10.3390/rs70403548