chapter  5
GIS-Based Measures of Spatial Accessibility and Application in Examining Health Care Access
Pages 20

Accessibility is determined by the distributions of supply and demand and how they are connected in space, and thus is a classic issue for location analysis well suited for GIS to address. This chapter focuses on how spatial accessibility is measured by GIS-based methods. Section 5.1 overviews the issues on accessibility, followed by two GIS-based methods for defining spatial accessibility: the floating catchment area method in Section 5.2 and the gravity-based method in Section 5.3. Section 5.4 illustrates how the two methods are implemented in a case study of measuring access to primary care physicians in the Chicago region. The chapter is concluded with extended discussion and a brief summary.