标题： 通过出行活动界定城市内部空间连通性模式：中国北京案例研究 显示英文标题

标题： Delineating Intra-Urban Spatial Connectivity Patterns by Travel-Activities: A Case Study of Beijing, China

摘要： 旅行活动已被广泛应用于量化地点、地区和国家之间的空间互动。 在本文中，我们通过出租车OD数据集对北京的652个交通分析区（TAZ）之间的空间连通性进行建模。 首先，我们揭示了北京城市内部空间连通性的引力结构。 总体而言，TAZ之间的相互作用由引力模型$G_{ij} = {\lambda}p_{i}p_{j}/d_{ij}$所主导，其中$p_{i}$、$p_{j}$分别是TAZ$i$、$j$的度数，$d_{ij}$是它们之间的距离，拟合优度约为0.8。 其次，基于网络的分析很好地揭示了北京的多中心形态。 最后，我们根据其时空模式检测了TAZ之间连通性的语义。 我们进一步发现，偏离引力模型的TAZ连接可以通过链接语义得到很好的解释。 显示英文摘要

摘要： Travel activities have been widely applied to quantify spatial interactions between places, regions and nations. In this paper, we model the spatial connectivities between 652 Traffic Analysis Zones (TAZs) in Beijing by a taxi OD dataset. First, we unveil the gravitational structure of intra-urban spatial connectivities of Beijing. On overall, the inter-TAZ interactions are well governed by the Gravity Model $G_{ij} = {\lambda}p_{i}p_{j}/d_{ij}$, where $p_{i}$, $p_{j}$ are degrees of TAZ $i$, $j$ and $d_{ij}$ the distance between them, with a goodness-of-fit around 0.8. Second, the network based analysis well reveals the polycentric form of Beijing. Last, we detect the semantics of inter-TAZ connectivities based on their spatiotemporal patterns. We further find that inter-TAZ connections deviating from the Gravity Model can be well explained by link semantics.