With the rapid development of social economy in Chengdu, it is of great significance to analyze the accessibility of a public facilities resources, and services in respective regions for the spatial planning of public facilities and the optimization of urban construction in Chengdu. Most existing studies only consider the accessibility of a single public facility under a single transportation mode studying facilities at the same level. In this research, with the consideration of all these factors mentioned above, an improved 3-step floating catchment area (3SFCA) model of multi-transportation modes is introduced to analyze the accessibility and spatial distribution of multiple types of public facilities under multiple traffic modes. The new model classifies the grade of public facilities and calculates the service accessibility of public facilities under the driving, public transport, cycling, and walking modes in the five dimensions of education, medical care, commerce, transportation, and leisure in the central urban areas of Chengdu. Through the comparative analysis of multiple models, we found that the improved 3SFCA can more accurately evaluate the accessibility of all dimensions of public facilities in central urban areas of Chengdu. The accessibility of compound public facilities in the central city is excellent. With the gradual expansion to the outward areas, the diversity and accessibility of compound public facilities gradually decreases. Furthermore, the accessibility distribution of public facilities in the study area is not balanced. The accessibility between the central urban areas and the marginal areas differs greatly and the spatial differentiation is substantial.

中文翻译：

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基于多种交通方式的中心城区多种公共设施可达性分析——以成都市为例

随着成都市社会经济的快速发展，分析各区域公共设施资源和服务的可达性，对于成都市公共设施空间规划和优化城市建设具有重要意义。大多数现有研究仅考虑单一公共设施在单一交通方式下的可达性，研究同一水平的设施。本研究综合考虑上述因素，引入改进的多交通方式三步浮动集水区（3SFCA）模型，分析多种交通方式下多种类型公共设施的可达性和空间分布。新模型对中心城区公共设施等级进行分级，计算中心城区教育、医疗、商业、交通、休闲五个维度的公共设施在驾车、公共交通、自行车、步行方式下的服务可达性成都的。通过多个模型的对比分析，我们发现改进后的3SFCA能够更加准确地评估成都中心城区公共设施各维度的可达性。中心城区综合公共设施可达性极佳。随着逐渐向外扩展，复合型公共设施的多样性和可达性逐渐下降。此外，研究区内公共设施的可达性分布也不均衡。中心城区与边缘地区可达性差异较大，空间分异明显。