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TU2.T10.2.ppt
1. THE IMPACT OF OCEAN SURFACE FEATURES ON THE WIND RETRIEVAL FROM SAR Xiaofeng Yang, Ziwei Li Institute of Remote Sensing Applications, CAS , Beijing 100101, China Xiaofeng Li, William Pichel NOAA/NESDIS
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8. Comparison SAR with scatterometer 234 R-1 SAR images collected off the U.S. West Coast are reprocessed to winds and compared with QuikSCAT . 111 ASAR VV images collected off the U.S. Coast are reprocessed to winds and compared with ASCAT . X. Yang et al , IEEE TGRS, 2011
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12. Near Shoal SAR Wind Accuracy-2 QuikSCAT winds are inconsistent with the SAR winds within 100 km from the coastline. An empirical exponential relationship to corrected coastal QuikSCAT winds is proposed as follow: X. Yang et al , IEEE GRSL, 2011
17. Model Coefficients Determination warm cold △ SST data obtained from NOAA AVHRR △ NCRS extracted from SAR images Assuming wind speed of low SST area is the actual wind speed. We use 116 RADARSAT-1 SAR, AVHRR SST and NDBC buoy wind data to calculate function coefficients (α1andα2 ).
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20. Reprocess SAR Wind Retrieval Wind Speed Before SST Correction cloud AVHRR SST Wind Speed After SST Correction +
As more and more multi-polarization data become available from SAR satellites, it will become increasingly important to measure consistent winds from all polarization modes. Below, HH and VV winds are compared taken from the same ENVISAT ASAR Alternating Polarization image. The Thompson polarization ratio has been used here. Further work is underway to improve the HH/VV ratio relationship used in the wind Geophysical model Function.
Fig. shows the wind retrieval error for 0.5- and 1.0-dB calibration errors, which are comparable to the current ENVISAT ASAR instrument NRCS calibration errors.
We scatter plot the matchup data in this near shore region (< 100 km) in Fig.
There is clear SST pattern on SAR winds images. The SAR wind speed image is combined by two consecutive Radarsat-1 WS retrieval results. NSS.R1.AF.D06125.T110503.P36N075.P35N074.A.h0.6.CMOD5.aplwind2.hdf NSS.R1.AF.D06125.T110456.P36N075.P35N074.A.h0.6.CMOD5.aplwind2.hdf
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