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Two-Step Floating Catchment Area

The two-step floating catchment area (2SFCA) method measures spatial accessibility to constrained services — most famously physicians and hospitals — by accounting not only for how close supply is but for how many other people are competing for it. Introduced by Wei Luo and Fahui Wang in 2003, it works in two passes: first computing a supply-to-demand ratio at every service location, then summing those ratios over all services within reach of each population site. The result is a single accessibility score per location that captures both proximity and crowding, and it has become the standard measure of access to healthcare and other capacity-limited services.

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Two-Step Floating Catchment Area Method (2SFCA)

Taksonoomiline meetodikirje · process-pipeline / human-geography

Luo, W., & Wang, F. (2003). Measures of spatial accessibility to health care in a GIS environment: synthesis and a case study in the Chicago region. Environment and Planning B: Planning and Design, 30(6), 865–884. · DOI 10.1068/b29120

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Taxonomic bucketAccessibility Analysismachine-suggested · Relational suggestion, not evidence.Same method familyCatchment Area Analysismachine-suggested · Relational suggestion, not evidence.Used in the same domainGravity Model of Migrationmachine-suggested · Relational suggestion, not evidence.Same method familyIsochrone Analysismachine-suggested · Relational suggestion, not evidence.