School;
of;
Resources;
and;
Geoscience,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou,;
Jiangsu;
221008,;
China;
School;
of;
Environmental;
Science;
and;
Spatial;
lnformatics,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou,;
Jiangsu;
221008,;
China;