First Institute of Oceanography;
Ministry of Natural Resources;
Qingdao 266061;
China;
Aerospace Information Research Institute;
Chinese Academy of Sciences;
Beijing 100190;
China;
Laboratory of Target Microwave Properties;
Deqing Academy of Satellite Applications;
Deqing 313200;
China;
College of information and engineering;
Ocean University of China;
Qingdao 266071;
China;
significant; wave; height; Envisat; ASAR; GA-PLS; optimal; feature; subset;