Influences of Urban Expansion on Urban Heat Island in Beijing during 1989–2010

Table 2

The characteristics of urban land expansion in Beijing during 1989–2010 (unit: area-km²).

Zone	1989		2000		2010		1989–2000		2000–2010
	Area	BCI	Area	BCI	Area	BCI	𝑀ue	𝐼ue	𝑀ue	𝐼ue
N	27.25	0.57	71.98	0.27	109.93	0.17	14.92	1.14	5.27	1.06
NE	70.17	0.24	120.25	0.29	149.50	0.26	6.49	1.30	2.43	0.84
E	30.82	0.31	93.53	0.21	141.87	0.19	18.50	1.63	5.17	1.38
SE	23.84	0.41	72.19	0.37	103.09	0.33	18.44	1.23	4.28	0.87
S	36.07	0.19	121.20	0.19	185.48	0.14	21.45	2.17	5.30	1.80
SW	102.03	0.17	159.00	0.25	186.34	0.22	5.08	1.48	1.72	0.78
W	72.13	0.19	121.35	0.22	138.86	0.17	6.20	1.28	1.44	0.50
NW	58.60	0.28	130.75	0.26	181.67	0.20	11.19	1.84	3.89	1.43
Built up area	420.93	0.11	890.25	0.11	1196.75	0.09	10.14	1.51	3.44	1.08