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HY-2 has been launched by China on August 16,2011 which assembles multi-microwave remote sensing payloads in a body and has the ability of monitoring ocean dynamic environments.The HY-2 satellite data need to be calibrated and validated before being put into use.Based on the in-situ buoys from the National Data Buoy Center(NDBC),Ku-band significant wave heights(SWH,hs)of HY-2 altimeter are validated.Eleven months of HY-2 altimeter Level 2 products data are chose from October 1,2011 to August 29,2012.Using NDBC 60 buoys yield 902 collocations for HY-2 by adopting collocation criteria of 30 min for temporal window and 50 km for a spatial window.An overall RMS difference of the SWH between HY-2 and buoy data is 0.297 m.A correlation coefficient between these is 0.964.An ordinary least squares(OLS)regression is performed with the buoy data as an independent variable and the altimeter data as a dependent variable.The regression equation of hs is hs(HY-2)=0.891×hs(NDBC)+0.022.In addition,2016 collocations are matched with temporal window of 30 min at the crossing points of HY-2 and Jason-2 orbits.RMS difference of Ku-band SWH between the two data sets is 0.452 m.
HY-2 has been launched by China on August 16, 2011 which assembles multi-microwave remote sensing payloads in a body and has the ability of monitoring ocean dynamic environments. The HY-2 satellite data need to be calibrated and validated before being put into use.Based on the in-situ buoys from the National Data Buoy Center (NDBC), Ku-band significant wave heights (SWH, hs) of HY-2 altimeter are validated. Eleven months of HY-2 altimeter Level 2 products data are chose from October 1, 2011 to August 29, 2012. Using NDBC 60 buoys yield 902 collocations for HY-2 by adoption collocation criteria of 30 min for temporal window and 50 km for a spatial window. An overall RMS difference of the SWH between HY -2 and buoy data is 0.297 mA correlation coefficient between these is 0.964.An ordinary least squares (OLS) regression is performed with the buoy data as an independent variable and the altimeter data as a dependent variable.The regression equation of hs is hs ( HY-2) = 0.891 × hs (NDBC) + 0.022 In addition, 20 16 collocations are matched with temporal window of 30 min at the crossing points of HY-2 and Jason-2 orbits. RMS difference of Ku-band SWH between the two data sets is 0.452 m.