Guangzhou;
Institute;
of;
Geography,;
Guangzhou;
510070,;
China;
Centre;
of;
Urban;
Planning;
and;
Environmental;
Management,;
The;
University;
of;
Hong;
Kong,;
Hong;
Kong;
SAR,;
China;
principal; components; analysis,; cellular; automata,; geographical; information; systems,; urban; simulation.;