The approaches to measuring the potential spatial access to urban health services revisited: distance types and aggregation-error issues

Table 2 Distances calculated between health services and spatial units

Spatial units (origins)		Health services (destinations)	Types of distance^a	Distances calculated
Type	N	Health services (destinations)	Types of distance^a	Distances calculated
Census tract centroids	904	535	6	2,901,840
Dissemination area centroids	6167	535	6	19,796,070
Block centroids	27,126	535	6	87,074,460
Block centroids adjusted with the land use map	27,126	535	6	87,074,460
Total	61,323	535	6	196,846,830

^aEuclidean, Manhattan, shortest network time (on foot), shortest network time (by car), shortest network time (by bicycle), and shortest network time (by public transit)

ISSN: 1476-072X