The First Institute of Oceanography;
Ministry of Natural Resources;
Qingdao 266100;
China;
Laboratory for Regional Oceanography and Numerical Modeling;
Qingdao National Laboratory for Marine Science and Technology;
Qingdao 266237;
China;
Institute of Oceanology;
Chinese Academy of Sciences;
Qingdao 266071;
China;
Kuroshio axis detection; Kuroshio path detection; mathematical verification; satellite absolute geostrophic velocity; principal-component detection;