College,;
Shandong;
University;
of;
Science;
and;
Technology,;
Qingdao;
266590,;
China;
Laboratory;
of;
Surveying;
and;
Mapping;
Technology;
on;
Island;
and;
Reef;
of;
National;
Administration;
of;
Surveying,;
Mapping;
and;
Geoinformation,;
Qingdao;
266590,;
China;