基于交通等时线的城市商圈识别及交通要素研究——以长沙五一广场商圈为例

Study on Recognition and Traffic Factors of Wuyi Square Urban Trade Area Based on Traffic Isochrones

借助高德导航路径规划API,指定长沙五一广场为中心点,生成边长为35千米正方形区域空间范围内的点阵,利用空间插值获取小汽车、公共交通、自行车和步行四种不同交通方式的时耗栅格,生成不同时间间距的等时线,以等时线为依据识别不同交通方式的城市商圈。四种交通方式的等时线商圈具有不同的空间形态和空间结构特征,空间形态与交通速度、道路依赖性两者都呈反向关系,速度越慢和对道路及路线依赖性越弱的交通方式,空间形态越规则均匀,越呈同心圆形态,反之空间形态越不规则均匀,越呈空心触角形态。从加强快慢综合立体交通规划、优化城市商圈布局的空间结构两个层面提出了对策建议。

By means of path planning API of Gaode navigation,we designated Wuyi Square of Changsha as generating point matrix in a square area with length of 35 kilometers.Spatial interpolation for car,public transport,cycling a d walking.Different time intervals of isochronous lines are generated according to the grid.We use isochronous lines to identify the urban trade aea with different modes of transportation.Results have shavwi that there is signific n t difference from isochronous lines of four traffic modes.Isochronous trade aea of the four kinds of traffic has different spatial form and spatial structure.The spatial form has a reverse relationship with traffic speed and road dependence.The slower speed and less dependent on the road and route of transportation is,the more uniform of spatial form and the more concentric circular shape gets.The more irregular uniform of spatial form is,the more hollow antenna shape gets.The countermeasures and suggestions strengthening the fast and slow comprehensive traffic plan and optimizing the spatial structure of urban trade aea.