| In China’s "14th Five-Year Plan",building a perfect metropolitan area has become one of the important development strategies.The role and significance of the metropolitan road network in this strategy is also very important,which can accelerate the integrated development of the metropolitan area,build interconnection between regions.In order to better play the key role of the metropolitan road network,it is necessary to study the topological characteristics of the metropolitan road network,and adopt the corresponding improvement measures and construction goals for the construction of the road network according to the topological characteristics.Taking Xi’an Metropolitan Area as an example,this paper establishes a Stroke algorithm model based on the same name road constructed from the OSM dataset.According to the spatial syntax principle introduced into the above model.Spatial syntax principles were introduced to evaluate the network topology,and spatial indicators such as connectivity,control,depth,integration,and choice were calculated using Axwoman.By analyzing the coupling between the indicators and the importance of spatial form in the road network topology,the most suitable indicators were selected to study the network topology characteristics.The topological characteristics of the road network are based on the topological network model obtained by dual mapping of the road stroke model of the same name in Xi’an metropolitan area,and the static topological characteristics of the road network in the metropolitan area: small world,scale-free,extended and connected characteristics are studied by selecting spatial indicators and complex network theory.The dynamic topology characteristics adopt robustness to represent the topological relationship of the adjacency matrix as the research object,and the directional interference and random interference based on the degree of connection,integration and selectivity are simulated through MATLAB programming,and finally the experimental results are analyzed and studied based on the relative size of network efficiency and network connectivity rate.The results indicate that the correlation analysis of connectivity,integration,and choice with the network efficiency difference can verify their reliability as a study of the topological characteristics of the Xi’an urban road network,and it exhibits a positive correlation.In the study of static topological characteristics,it is found that the road network of Xi’an metropolitan area is a circuit model with small world and scale-free characteristics and strong expansion potential,and the dynamic topological characteristics under the conditions of external factors interference and own factors-robustness is more prominent in random interference and poor in directional interference.At the same time,the robustness under different interference conditions is manifested as random interference>directional interference based on integration>directional interference based on connectivity>directional interference based on selectivity,and roads with top 30% of spatial indicators and network efficiency change value greater than 0.25% play a key role in the metropolitan road network.Based on the roads that have a great influence on the topological characteristics of the road network,relative measures can be taken to ensure the stability of the road network from external interference.It can be seen that combining the spatial perspective with the perspective of network topology can fully understand its dynamic and static topological characteristics,avoid the limitations of studying the topological characteristics of the road network of Xi’an metropolitan area from a single perspective,and deeply understand the structural characteristics of the road network of Xi’an metropolitan area,so as to provide valuable suggestions for the comprehensive development planning of Xi’an metropolitan area and its road network. |
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