沈阳市城市公园绿地可达性分析

Analysis of urban park accessibility in Shenyang City

城市公园绿地可达性是反映公园服务水平与布局合理性的重要指标。本文以沈阳市为例,利用GIS技术,分别采用缓冲区分析法与网络分析法,结合道路与人口数据对城市三环内公园绿地可达性进行对比分析。结果表明:沈阳市三环内城市公园绿地可达性水平和服务效率较低;缓冲区分析法计算的可达面积大于网络分析法,15 min时两种方法结果相差近一倍;城市中心区域可达性好于周边;两种评价方法下可达面积差异的数量关系与路网形式有关;方格式路网中,5 min时两种方法结果相差约3倍,随可达时间增加,差异逐渐缩小。本研究可为合理优化绿地空间结构提供理论基础。

Urban park accessibility is an important index, which reflects the service level and the layout reasonability of urban parks. Using the network analysis and simple buffering methods from GIS technique, in combination with the data of roads and population, we evaluated the accessi- bility of urban parks within the 3rd Ring Road area in Shenyang City, Liaoning Province. The re- sults show that the urban parks＇ accessibility and quality of services are low within the 3rd Ring Road area of Shenyang. The accessible area measured by simple buffering is larger than that by network analysis, and their difference is nearly twice when the access time is within fifteen mi- nutes. The accessibility of urban parks in the urban center area is much better than that of those parks in the suburb. The numerical relation of accessible area＇ s difference is related to the types of urban road network. In check-board road network, the accessible area calculated using simple buffering is nearly three times larger than that by network analysis when the access time is within fifteen minutes, and the difference decreases gradually with the time increasing. This study can provide theoretical basis for optimizing green space structure.