접근도를 통한 수도권 지하철 역세권의 잠재적 이용률 분석 연구

Analysis on Potential Use of the Seoul Metropolitan Subway on the Basis of Accessibility

  The paper reports on a study to conduct a measurement of regional accessibility of Seoul Metropolitan Subway in Korea with respect to geographical configuration of the subway network and the spatial distribution of land uses in the region as well as in each catchment area of the subway stations seeking for its more effective use. The regional accessibility of Seoul Metropolitan Subway in terms of work trips should be represented by means of the population and employment which can potentially reach a station from all other stations of the network. The accessibility measuring model developed using raster GIS technique disaggregates the population and employment of a catchment area into 785,000 raster cells (75m × 75m) and determines network travel times between raster cells using a time-oriented minimum-path algorithm. The results of the study are applicable for land-use and/or transport policies for the Seoul Metropolitan Area at micro level, e.g. land-use changes in some subway catchment areas and/or headway improvements in some links of the network, as well as at macro level, e.g. alterations of its urban structure and/or introductions of new subway lines. The paper starts with an theoretical analysis of potential accessibility of subway. It continues to represent the accessibility measuring model developed in this study using raster GIS combined with networks coded as vectors. The model is implemented to investigate the ineffective use of the Seoul Metropolitan Subway at the micro level. A weighted average and a GINI coefficient are used to analysis the model results at the urban regional level of the Seoul Metropolitan Area. The paper concludes with a discussion of the interpretation of the model results and the future research tasks for further development of the model.