The validation of HY-2 altimeter measurements of a significant wave height based on buoy data
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The validation of HY-2 altimeter measurements of a significant wave height based on buoy data WANG Jichao1,2,4 , ZHANG Jie3∗ , YANG Jungang3 1
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China University of Chinese Academy of Sciences, Beijing 100049, China 3 First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China 4 College of Science, China University of Petroleum, Qingdao 266580, China 2
Received 10 Decemeber 2012; accepted 4 March 2013 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2013
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 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 h s (HY-2)=0.891×h s (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. Key words: altimeter, buoy, significant wave height, validation, regression analysis Citation: Wang Jichao, Zhang Jie, Yang Jungang. 2013. The validation of HY-2 altimeter measurements of a significant wave height based on buoy data. Acta Oceanologica Sinica, 32(11): 87-90, doi: 10.1007/s13131-013-0382-5
1 Introduction Methods of getting ocean environmental information can be divided into a theoretical analysis, a numerical model prediction and observation. Observation results can contribute to the progress of the theoretical analysis. On the other hand, Observation data can be used to develop a forecast model and improve forecast technology. The traditional wave observation mainly depends on buoys, survey ships, and tide stations with irregular spatial and temporal resolutions, and the coverage is very limited. The traditional observation could not meet the needs of the current high speed development of economy, military and scientific research. Altimetry technology solves the problem effectively. Altimeter data provide a reliable means of an ocean wave observation. At present, People have accumulated a long time wave observation data supplied by many satellites. However, due to the difference of satellite parameters, data processing and the accuracy
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