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The ease of approach to one location from other locations: in terms of the distance travelled, the cost of travel, or the time taken. Accessibility relies on location, where the relativity of space is estimated in relation to transport infrastructures (J.-P. Rodrigue2006) and distance, derived from the connectivity between locations. It is a key element in transport geography.

Topological accessibility

is measured in relation to a system of nodes and paths (transportation network), assuming that accessibility is significant only to specific elements of a transport system, such as airports or ports. Contiguous accessibility is a measurable attribute of every location, as space is considered in a contiguous manner. See Miller and Wu (2000) GeoInformatica 4, 2) on GIS software for space-time accessibility measures. Physical accessibility is the spatial separation of people from the supply of goods and services; see, for example, Orcao and Diez-Cornago (2007) Area 39, 3 on physical access to health services in Spain, and Gage and Calixte (2006) Pop. Studs. 60, 3 on maternal health services in Haiti. Social accessibility is the ability of an individual to reach a resource or location, as affected by class structures, income, age, educational background, gender, or race. See Parks (2004) Econ. Geog. 80, 2 on social accessibility in Los Angeles, and the UK Transport Studies Group's Social Accessibility Mapping Project.

Subjects: Earth Sciences and Geography.

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