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【正文】 Medical Geography: Health Care Accessibility and Implications Fahui Wang Fred B. Kniffen Professor of Geography Louisiana State University June 17, 2022 @ CNU Contents ? The issue of access ? GISbased accessibility measures ? Optimization towards equal access ? Application in healthcare access ? PHSA designation and latestage cancer ? Concluding ments Access Matters! ? Convenience of access to activities ? job, school, healthcare, park, public service, shopping … ? Access defines “l(fā)ocation” ? Spatial ? Where you are ? Nonspatial ? Who you are ? Social justice and public policy Measurement ? How scarce are the services? ? Supply vs. Demand (ratio) ? How far are demands from supplies? ? Distance ? Road work ? Transportation means Primitive measures ? Distance (time) from supply ? Simply potential model ? Supplydemand ratio within an area ? FCA with a radius/box ? FCA with a travel time range ? ?? j ijji dSA ?From S/D Ratio to FCA ? Simply S/D Ratio ? FCA with a Radius ? Improvements ? Withinunit variation ? Crossborder ? Limitations ? Straightline ? SD beyond radius 2step floating catchment area: 2SFCA ? Scale availability at each supply location ? Sum up accessible supplies around each demand location 2SFCA Recap 1a. For each supply location j, select all demand locations k within a travel time range from j (catchment Cj). 1b. Compute the supply to demand ratio within Cj: 2a. For each demand location i, search all supply locations j within the travel time range from i (catchment Zi). 2b. Sum up the supply to demand ratios at these supply locations: ???jCkkjj PSR /? ??? ????i ji Zj CkkjZjji PSRA )/(Generalizing “distance decay” ? as a continuous function ? a power or expo
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