基于Logistic模型与成本加权距离方法的济南城市公园综合可达性分析

INTEGRATED ACCESSIBILITY ANALYSIS OF URBAN PARK IN JINAN CITY BASED ON LOGISTIC MODEL AND COST WEIGHTED DISTANCE METHOD

城市公园是城市绿色基础设施的重要组成部分，具有重要的社会、经济和生态文化功能，其空间布局合理与否直接影响到城市公园的可达性与公平性．以济南市为例，采用2009年ALOS遥感影像数据，基于RS和GIS软件平台，解译获取了研究区土地利用现状图、道路交通和城市公园等空间数据，构建了城市公园吸引力综合指数，并基于道路网络，采用成本加权距离分析方法计算研究区城市公园的空间可达性，最后基于logistic模型计算了城市公园的综合可达性，以表征城市公园自身属性特征（吸引力）和交通可达性的综合影响．研究结果表明：1）济南城市公园空间可达性和综合可达性总体水平均较好，20min内可达区域约占研究区的80％，但空间分布不均衡，中心高外围低，南部受地形影响可达性普遍较低；2）吸引力比较强的公园周边可达性水平明显提升，说明城市公园吸引力对可达性的影响较为显著．研究结果丰富了可达性研究的内涵，可为城市规划者和决策者进行城市绿地空间布局和城市绿地景观设计提供一定的科学依据与参考．

Urban park as one of the part of urban green infrastructure has important social, economic, ecological and cultural functions. The spatial distribution of urban parks will affect their utilization, accessibility and equity directly. We take Jinan city as the study area to analyze the spatial accessibility of urban park and get the integrated accessibility of urban park based on the cost weighted distance method and logistic model as well as the PCI （Park Attractive Index）. The analysis was supported by using the land use, road network, and urban parks data interpreted manually from the ALOS remote sensing image （2009） based on RS and GIS. The results indicate that： 1 ） in general, urban parks have a good spatial accessibility and integrated accessibility. The accessibility in 20 minutes accounts for about 80% of the study area, however, the spatial distribution is not balanced. It shows that higher accessibility is in the center but lower in the periphery. In addition, the mountain areas in the south decrease the integrated accessibility ; 2） the parks have higher PCI will increase their integrated accessibility significantly. The research will help to improve the accessibility analysis method, and at the same time will provide an important reference for city planners and decision -makers to desig,, and manage the urban parks.