DepartmentofTerritoryResourceInformationandSurveyingEngineering;
XuzhouNormalUniversity;
Xuzhou221116;
P.R.China;
DepartmentofRSandGIS;
ChinaUniversityofMiningandTechnology;
Xuzhou221008;
P.R.China;
SchoolofRemoteSensingandInformationEngineering;
WuhanUniversity;
Wuhan430079;
P.R.China;