| The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data |
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| 作者姓名： | WANG Jichao ZHANG Jie YANG Jungang |
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| 作者单位： | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Science, China University of Petroleum, Qingdao 266580, China;First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China;First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China |
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| 基金项目： | The Special Funds of State Oceanic Administration for Marine Commonweal Research under contract Nos 201105032-1 and 201305032;the Special Project of State Oceanic Administration of Poles Environmental Investigation and Assessment under contract No. CHINARE2012-02-04;the European Space Agency (ESA)-Minister of Science and Technology of the Peoples Republic of China (MOST) Dragon 3 Cooperation Programme under contract No. 10466. |
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| 摘 要： | 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 Nation- al 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 tempo- ral 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 vari- able. 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 rain 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.
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| 关 键 词： | 资料浮标 验证 波高 高度计 太阳能热水器 普通最小二乘法 测量 时间窗口 |
| 收稿时间： | 2012/12/10 0:00:00 |
| 修稿时间： | 3/4/2013 12:00:00 AM |
The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data |
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| WANG Jichao,ZHANG Jie,YANG Jungang.The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data[J].Acta Oceanologica Sinica,2013,32(11):87-90. |
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| Authors: | WANG Jichao ZHANG Jie and YANG Jungang |
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| Institution: | 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Science, China University of Petroleum, Qingdao 266580, China2.First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China |
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| Abstract: | 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 fromthe 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 30min 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. |
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| Keywords: | altimeter buoy significant wave height validation regression analysis |
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