State;
Key;
Laboratory;
for;
Information;
Engineering;
in;
Surveying,;
Mapping;
and;
Remote;
Sensing,;
WuhanUniversity,;
Wuhan;
430079,;
China;
Transportation;
Research;
Center,;
Wuhan;
University,;
Wuhan;
430079,;
China;
School;
of;
Electronic;
Information,;
Wuhan;
University,;
Wuhan;
430079,;
China;