進階式兩階段流動搜尋法及其應用：以臺中市醫療可及性分析為例

Enhanced Two-Step Floating Catchment Area Method and Its Application: A Case Study of Healthcare Accessibility Analysis in Taichung City

空間可及性分析是指評估從一個特定位置到達服務設施（例如工作地點、公共設施、醫療資源等）的難易程度。透過空間可及性分析，可以檢視供應端所提供服務的程度，並量化不同空間位置的可及性。本研究的目標是分析臺中市醫療資源的可及性，研究中採用村里邊界、大型醫院、衛生所和路網等公開資料集，並應用進階式兩階段流動搜尋法進行分析。步驟包括建立村里中心點坐標、建立醫療設施位置坐標、計算起點至終點的距離矩陣，以及進行進階式兩階段流動搜尋法的供給面和需求面分析。依據本研究實驗材料之臺中市醫療資源可及性分析成果，距離市中心越遠，醫療資源的可及性越低，大部分缺乏醫療資源的村里位於偏遠的郊區和山區地區。

Spatial accessibility analysis refers to evaluating the ease of reaching service facilities (such as workplaces, public amenities, healthcare resources) from a specific location. Through spatial accessibility analysis, the extent of services provided by the supply side can be examined and the accessibility of different spatial locations can be quantified. This study aims to analyze the accessibility of healthcare resources in Taichung City. Public datasets including village boundaries, major hospitals, clinics, and road networks were utilized, and an enhanced two-step floating catchment area method (E2SFCA) method was applied for the analysis. The steps involved establishing the coordinates of village centroids, and healthcare facility locations, computing the distance matrix from origins to destinations, and conducting supply-side and demand-side analyses using the E2SFCA method. Based on the results of the accessibility analysis of healthcare resources in Taichung City using the experimental materials in this study, it was found that the longer the distance from the city center, the lower the accessibility of healthcare resources, with a majority of underserved villages located in remote suburban and mountainous areas.