增强型两步移动搜索模型的参数灵敏度研究

Parameter Sensitivity Study of the Enhanced Two-Step Floating Catchment Area Model

采用局部灵敏度分析方法,结合可视化技术,以深圳市就医可达性为例对E2SFCA模型的3个主要参数——距离衰减指数(β)、划分子区域大小(Sub_Size)、极限搜索距离(Catchment_Size)的灵敏度进行分析。研究结果表明,3个参数的取值对可达性评价结果都有着不同程度的影响,其中Catchment_Size的影响最为明显,Sub_Size和β的取值也与Catchment_Size的大小有关。

In this paper,the local sensitivity analysis combined with the visualization technology was introduced into the parameter sensitivity analysis of E2 SFCA with three main parameters,which are distance decay index（β）,Sub-Size and Catchment-Size. The case study of accessibility to primary healthcare service in Shenzhen shows that the three parameters have different influence on the final evaluation results of accessibility. The reachability of the evaluation results fluctuates greatly with the variation of Catchment-Size and the other parameters are associated with the size of Catchment-Size.