基于GIS的城市轨道交通站点客流辐射区域算法

Algorithm for Generating the Radiation Service Areas of Passenger Flow at Urban Mass Transit Stations Based on GIS

为界定城市轨道交通站点的客流辐射区域,提出基于栅格数据的GIS缓冲区算法。利用空间数据格式中的栅格数据表示道路网络和非道路网络,并通过定义栅格的属性首先计算城市交通道路网络各个栅格单元距轨道交通站点的累计成本距离,然后计算非交通路网每个栅格单元距最近道路的距离,最后累计得到每个栅格单元距离最近站点的通行成本距离,进而得出轨道交通每个站点的客流辐射区域。由于每个栅格被赋予所属站点的标识值,从而避免了各个站点间客流辐射区域的交叉重叠。通过对2008年北京市轨道交通站点的客流辐射区域进行界定,验证了该方法的有效性。

A raster-based GIS buffer algorithm is proposed for delimiting the radiation service areas of passenger flow at urban mass transit stations. In the algorithm, road network and non-road network are represented by raster data which are assigned appropriate attribute values. By first calculating the accumula- tive cost distance from each grid on-road network to the nearest station and then the distance from each grid off-road network to the nearest road network, the minimum accumulative cost distance to the nearest station of each grid is computed. Therefore, the radiation service areas of passenger flow at urban mass transit stations are derived from the minimum accumulative cost distance. Since each grid has the ID value of its related station, the overlaps between stations radiation service areas are avoided. Finally, the method is validated by generating the radiation service areas of passenger flow at mass transit stations in Beijing, 2008.