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Articles

Inverted Two-Step Floating Catchment Area Method for Measuring Facility Crowdedness

Pages 251-260 | Received 01 Feb 2017, Accepted 01 Jun 2017, Published online: 09 Oct 2017
 

Abstract

The popular two-step floating catchment area (2SFCA) method has been widely used in the literature to measure spatial accessibility of residents for a service. The 2SFCA method accounts for the ratio between the supply capacity and demand amount of the service as well as the complex spatial interaction between them. This article introduces an inverted two-step floating catchment area (i2SFCA) method that is derived from an extension of the classic Huff model and used to capture the “crowdedness” (scarcity of resource or intensity of competition) for facilities. The method is illustrated and validated by a case study of evaluating hospital inpatient services in Florida. Several possible uses of the measure are also discussed.

盛行的两阶段流动搜寻法 (2SFCA), 在文献中已广泛地用来测量某项服务对居民的空间可及性。2SFCA 模型, 说明了服务的供给能力与需求量之间的比率, 以及两者之间的复杂空间互动。本文引介反向的两阶段流动搜寻法 (i2SFCA), 该方法来自于古典霍夫模型的延伸, 并用来捕捉设施的 “拥挤度” (资源的稀缺性或竞争的强度)。本文运用一个评估佛罗里达州医院住院服务的案例研究, 描绘并証实该方法。本文同时探讨运用该测量方法的若干可能性。

El popular método de área de captación flotante en dos pasos (2SFCA) ha sido utilizado profusamente en la literatura para medir la accesibilidad espacial de los residentes a un servicio. El método 2SFCA da cuenta de la proporción o ratio entre la capacidad de suministro y la cantidad de demanda del servicio, lo mismo que de la compleja interacción espacial entre ellas. Este artículo presenta un método inverso de área de captación flotante en dos pasos (i2SFCA), derivado de una extensión del clásico modelo de Huff, que es usado para captar la “congestión” por servicios (escasez del recurso o intensidad de la competencia). El método es ilustrado y validado por medio de un estudio de caso de evaluación de servicios para pacientes hospitalarios en Florida. También se discuten varios usos posibles de la medida.

Additional information

Notes on contributors

Fahui Wang

FAHUI WANG is James J. Parsons Professor in the Department of Geography and Anthropology, Louisiana State University, Baton Rouge, LA 70803. E-mail: [email protected]. His research interests include spatially integrated social sciences, public policy, and planning.

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