| WANG Jichao,ZHANG Jie,YANG Jungang. 2013. The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data. Acta Oceanologica Sinica, 32(11):87－90 |
| The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data |
| The validation of HY-2 altimetermeasurements of a significant wave height based on buoy data |
| Received:December 10, 2012 Revised:March 04, 2013 |
| DOI：10.1007/s13131-013-0382-5 |
| Key words:altimeter buoy significant wave height validation regression analysis |
| 中文关键词: altimeter buoy significant wave height validation regression analysis |
| 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. |
| Author Name | Affiliation | E-mail | | WANG Jichao | 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 | | | ZHANG Jie | First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China | zhangjie@fio.org.cn | | YANG Jungang | 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. |
| 中文摘要: |
| 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 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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