Table 4.

Aggregate land use pattern measures

Pattern measure	Developed land use pattern									Undeveloped land use pattern
	All development			High-density residential			Low-density residential
	1973	2000	% change	1973	2000	% change	1973	2000	% change	1973	2000	% change
Patch density	0.14	0.33	132.0	0.04	0.11	157.2	0.12	0.33	172.9	0.03	0.06	86.5
Mean patch size	0.60	0.52	−14.3	0.94	0.56	−40.4	0.27	0.25	−4.3	25.74	12.24	−52.4
Mean perimeter-to-area ratio	13.23	15.02	13.5	11.31	14.46	27.8	13.68	16.10	17.7	13.78	17.27	25.4
Contrasting edge ratio*	0.51	0.81	60.5	0.13	0.16	25.8	0.53	0.86	63.1	0.03	0.09	177.8
Contrasting edge proportion*	0.22	0.35	54.9	0.06	0.08	37.2	0.21	0.35	63.6	0.03	0.06	138.8
Mean dispersion* (1 km2)	0.37	0.38	2.7	0.23	0.21	−10.1	0.57	0.53	−6.3	0.03	0.08	131.9
Mean dispersion* (25 km2)	0.52	0.50	−3.0	0.39	0.33	−15.4	0.70	0.65	−7.2	0.07	0.12	62.5

*For developed (residential) land use measures, focal land use = developed (residential), and contrasting land use = undeveloped; for the undeveloped land use measures, focal land use = undeveloped, and contrasting land use = developed. Refer to Table 3 for pattern measure definitions.