The validation of HY-2 altimeter measurements of a significant wave height based on buoy data
The validation of HY-2 altimeter measurements of a significant wave height based on buoy data
复制标题
DOI：
10.1007/s13131-013-0382-5
复制
发表时间：
2013-11
影响因子：
1.4
通讯作者：
Jichao Wang;Jie Zhang;Jungang Yang
中科院分区：
文献类型：
--
作者：
Jichao Wang;Jie Zhang;Jungang Yang
HY-2是我国于2011年8月16日发射的具有海洋动力环境监测能力的多微波遥感有效载荷组合体。HY-2卫星数据在投入使用前需要进行校准和验证。利用国家数据浮标中心（NDBC）的现场浮标资料，对HY-2型高度计的Ku波段有效波高（SWH，hs）进行了验证。选取HY-2高度表二级产品2011年10月1日至2012年8月29日11个月的数据。采用时间窗为30 min、空间窗为50 km的配置标准，利用NDBC 60个浮标对HY-2进行了902个配置。HY-2和浮标数据之间SWH的总RMS差为0.297 m。它们之间的相关系数为0.964。以浮标数据为自变量，高度计数据为因变量，进行普通最小二乘（OLS）回归。回归方程为：hs（HY-2）=0.891×hs（NDBC）+0.022。此外，在HY-2和Jason-2轨道的交叉点处，以30分钟的时间窗口匹配2016个搭配。两个数据集的Ku波段SWH的RMS差为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 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 ishs(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.