基于验潮站资料的HY-2A测高数据质量评定
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摘要
验潮站资料为评定卫星测高海面高度观测值的精度提供了有效途径。基于数据编辑准则筛选出HY-2A数据,通过引入NCEP实时大气压模型,解决了HY-2A卫星任务后期测高数据产品中部分干对流层延迟项和大气逆压校正项不可用的问题。在此基础上,将HY-2A海面高观测值与验潮站数据进行时空匹配,在选取的9个站点上进行了相关系数和标准差计算。结果表明,两者相关系数平均约为0.676 9,最优可达0.898 7,平均标准差为0.089 5 m。整体验证结果表明,HY-2A卫星测高数据质量符合设计指标,达到预期水平,为海洋重力场反演等应用研究提供了新的可靠数据源。
The tide gauge data provide an effective way to evaluate the accuracy of satellite altimeter data.The HY-2A data are filtered based on the data edited criterion and the model of real-time atmospheric pressure provided by NCEP are used to solve the problem caused by the unavailable dry tropospheric correction and inverse barometer correction in the later stage of the HY-2A exact repeat mission(ERM).By matching the HY-2A altimeter data and the tide gauges data in temporal and spatial,the correlation coefficient and standard deviation between the two kinds of altimeter data are calculated in the nine selected tide gauges area.According to the analysis results,the average correlation coefficient is about 0.676 9,the optimum is up to 0.898 7,and the average standard deviation is 0.089 5 m.The results show that the quality of HY-2A satellite altimetry data meet the design target and achieve the expected level.It provides a new reliable data source for the application research of the marine gravity field inversion.
The tide gauge data provide an effective way to evaluate the accuracy of satellite altimeter data.The HY-2A data are filtered based on the data edited criterion and the model of real-time atmospheric pressure provided by NCEP are used to solve the problem caused by the unavailable dry tropospheric correction and inverse barometer correction in the later stage of the HY-2A exact repeat mission(ERM).By matching the HY-2A altimeter data and the tide gauges data in temporal and spatial,the correlation coefficient and standard deviation between the two kinds of altimeter data are calculated in the nine selected tide gauges area.According to the analysis results,the average correlation coefficient is about 0.676 9,the optimum is up to 0.898 7,and the average standard deviation is 0.089 5 m.The results show that the quality of HY-2A satellite altimetry data meet the design target and achieve the expected level.It provides a new reliable data source for the application research of the marine gravity field inversion.
引文
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[2]张庆君,张健,张欢,等.海洋二号卫星工程研制及在轨运行简介[J].中国工程科学,2013,15(7):12-18.Zhang Qingjun,Zhang Jian,Zhang Huan,et al.The study of HY-2A satellite engineering development and in-orbit movement[J].Engineering Science,2013,15(7):12-18.
[3]徐广珺,杨劲松,徐圆,等.海洋二号卫星高度计有效波高的验证与校准[J].遥感学报,2014,18(1):206-214.Xu Guangjun,Yang Jinsong,Xu Yuan,et al.Validation and calibration of significant wave height from HY-2 satellite altimeter[J].Journal of Remote Sensing,2014,18(1):206-214.
[4]Dean R G,Houston J R.Recent sea level trends and accelerations:comparison of tide gauge and satellite results[J].Coastal Engineering,2013,75:4-9.
[5]彭海龙,林明森,穆博,等.HY-2A卫星雷达高度计数据的全球统计评价及质量分析[J].海洋学报,2015,37(7):54-66.Peng Hailong,Lin Mingsen,Mu Bo,et al.Global statistical evaluation and performance analysis of HY-2A satellite radar altimeter data[J].Acta Oceanologica Sinica,2015,37(7):54-66.
[6]杨磊,周兴华,林明森,等.HY-2A卫星雷达高度计全球IGDR数据质量评估[J].地球物理学进展,2016,31(2):629-636.Yang Lei,Zhou Xinghua,Lin Mingsen,et al.Global statistical assessment of HY-2A altimeter IGDR data[J].Progress in Geophysics,2016,31(2):629-636.
[7]Zhang Shengjun,Li Jiancheng,Jin Taoyong,et al.HY-2A altimeter data initial assessment and corresponding two-pass waveform retracker[J].Remote Sensing,2018,10(4):507.
[8]国家卫星海洋应用中心.HY-2A卫星雷达高度计数据用户手册[M].北京:国家卫星海洋应用中心,2011.National Satellite Ocean Application Service.HY-2A Satellite Radar Altimeter Data User Manual[M].Beijing:National Satellite Ocean Application Service,2011.
[9]董晓军,黄珹.利用TOPEX/Poseidon卫星测高资料监测全球海平面变化[J].测绘学报,2000,29(3):266-272.Dong Xiaojun,Huang Cheng.Monitoring global mean sea level variation with TOPEX/Poseidon altimetry[J].Acta Geodaetica et Cartographica Sinica,2000,29(3):266-272.
[10]张有广,贾永君,范陈清,等.海洋二号卫星雷达高度计测高误差校正算法及验证[J].中国工程科学,2013,15(7):53-61.Zhang Youguang,Jia Yongjun,Fan Chenqing,et al.HY-2A satellite radar altimeter error correction algorithm and verification[J].Engineering Science,2013,15(7):53-61.
[11]李晓婷,郑沛楠,王建丰,等.常用海洋数据资料简介[J].海洋预报,2010,27(5):81-89.Li Xiaoting,Zhen Peinan,Wang Jianfeng,et al.Introduction of the ocean data in common use[J].Marine Forecasts,2010,27(5):81-89.
[12]金涛勇,李建成,王正涛,等.卫星测高逆气压改正及其对海平面变化的影响[J].武汉大学学报:信息科学版,2010,35(9):1017-1020.Jin Taoyong,Li Jiancheng,Wang Zhengtao,et al.Inverse barometer correction in satellite altimetry and its effect on mean sea level change[J].Geomatics and Information Science of Wuhan University,2010,35(9):1017-1020.
[13]Prandi G.Validation of altimeter data by comparison with tide gauge measurements[R].France:Collecte Localisation Satellites(CLS),2014.