National Engineering Research Center for Multimedia Software;
Wuhan University;
Wuhan 430072;
Hubei;
China;
The Key Laboratory of Multimedia and Network Commu-nication Engineering;
Wuhan University;
Wuhan 430072;
Hubei;
China;
Collaborative Innovation Center of Geospatial Technology;
Wuhan 430072;
Hubei;
China;