南京市公园绿地空间可达性与公平性评价

基于GIS技术,从步行、骑行、机动车驾驶3类交通方式的角度,采用网络分析法,对南京市公园绿地可达性和公平性进行了评价. 南京市公园绿地服务效果不理想,主城区的公园绿地可达性好于郊区,可达性呈现出由中心城区向四周逐渐减弱的趋势. 出行速度的提高使得主城区在越少的可达时间内公园绿地服务范围越大,越多的可达时间内服务范围越小,而郊区的可达区域面积比随着出行速度的提升,各类可达时间服务面积比均增大,但幅度较不明显. 公平性较好的街道空间分布较为分散,公平性较差的街道主要分布于郊区,少量位于中心区域.

Rationality Evaluation of Spatial Accessibilityand Fairness of Park Green Space in Nanjing

Park green space is the most important part of the green infrastructures and the rationality of its spatial distribution determines the service’s quality and level that it can provide for citizens. Using the network analysis based on GIS technique,we evaluate the accessibility of park green space in Nanjing from three vehicles include walking,cycling and driving. The service effect of park green space is not good in Nanjing and its accessibility in downtown is better than in suburbs,the accessibility is reducing from the center to the edge of the city. As the travel speed increases,park green space’s service areas of central city are larger in less travel time and smaller in more travel time,while park green space’s service areas of suburbs are lager in any travel time but not obvious. The distribution of streets with good fairness is dispersed,and streets with poor fairness are located in the suburb and a few streets are located in the central district.