2SFCA: Two-step Floating Catchment Area Method

Abstract: This article synthesizes two GIS-based accessibility measures into one framework, and applies the methods to examining spatial accessibility to primary healthcare in the Chicago 10-county region. The floating catchment area method defines the service area of physicians by a threshold travel time while accounting for the availability of physicians by their surrounded demands. The gravity-based method considers a nearby physician more accessible than a remote one and discounts a physician’s availability by a gravity-based potential. The former is a special case of the latter. Based on the 2000 Census and primary care physician data, this research assesses the variation of spatial accessibility to primary care in the Chicago region, and analyzes the sensitivity of results by experimenting with ranges of threshold travel times in the floating catchment area method and travel friction coefficients in the gravity model. The methods may be used to help the U.S. Department of Health and Human Services and state Health Departments improve health professional shortage areas designation.

Keywords: GIS; accessibility measures; gravity model; healthcare access; physician shortage areas; two-step floating catchment area method.

You can also find more details in this book: Quantitative Methods and Socio-Economic Applications in GIS (2nd Ed): https://www.routledge.com/Quantitative-Methods-and-Socio-Economic-Applications-in-GIS/Wang/p/book/9781138843622

Download from: https://www.niu.edu/landform/papers/luo_wang2003.pdf