Analysis on the Spatio-Temporal Characteristics of Urban Expansion and the Complex Driving Mechanism: Taking the Pearl River Delta Urban Agglomeration as a Case

Table 4

Interaction of different factor pairs on urban expansion intensity during 2000–2008.

Driving factors		Natural factors				Socio-economic factors
		DEM	Slope	DTR	DTC	DRH	PRG	GDPG	PCWG	FAIG	FIGR
Natural factors	DEM
	Slope	0.15
	DTR	0.16^↗	0.09^↗
	DTC	0.26	0.25	0.25^↗
Socio-economic factors	DRH	0.25	0.24	0.24^↗	0.33
	PRG	0.37^↗	0.26^↗	0.19^↗	0.38^↗	0.41^↗
	GDPG	0.66	0.66	0.66^↗	0.74	0.69	0.83^↗
	PCWG	0.32^↗	0.21^↗	0.13^↗	0.59^↗	0.36^↗	0.61^↗	0.92^↗
	FAIG	0.52	0.49	0.50^↗	0.67	0.55	0.77^↗	0.74	0.75^↗
	FIGR	0.34	0.28^↗	0.22^↗	0.51^↗	0.43^↗	0.61^↗	0.8	0.72^↗	0.69^↗

“↗” indicates that the interaction type between the two driving factors is a nonlinear enhancement. The remaining interaction type is a bienhancement. “” denotes the largest interaction of each type (pairs of natural factors, pairs of socio-economic factors, and pairs of natural and socio-economic factors).