Laboratory;
of;
Digital;
Earth;
Sciences,;
Institute;
of;
Remote;
Sensing;
and;
Digital;
Earth,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100094,;
China;
of;
Resoures;
and;
Environment,;
University;
of;
the;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
China;
Research;
Institute;
of;
Uranium;
Geology,;
Beijing;
100029,;
China;