下面是一段胡话，因为我来不及了，一会再来补充行不行
Locational analysis have been demonstrated very effectively in seeking the optimal spatial configuration of facilities for accomplishing availability, accessibility or other objectives.
Spatial accessibility to public health care services is an on-going interest such as the two-step floating catchment area (2SFCA) model.
As for the measurement of health care accessibility, provider-to-population ratios, travel impedance (travel time, travel distance or travel cost) to the nearest provider or average travel impedance to a set of providers and measures based on gravity models are the three main categories.
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