The Accessibility Assessment of National Transportation Network and Analysis of Spatial Pattern

摘要

The accessibility assessment is an effective way to qualify the performance of transportation network. This paper assesses China's transportation system with many impact factors, which are calculated using gravity model respectively, and then calculate the indicator of transport convenience with the method of weighted superposition. For better understanding of the spatial distribution pattern of transport accessibility and its relationship with socioeconomic status, statistical analysis and spatial autocorrelation analysis are made. The results show that accessibility of the national transportation presents an "east high, west low" spatial distribution pattern and has a positive correlation to regional economic development and population density. Besides, the spatial pattern of transport accessibility has a significant spatial aggregation, especially evident in some eastern cities, while the western part of the China doesn't have an apparent spatial aggregation, which also shows the considerable differences between the east and the west, revealing economic development and transport accessibility drive and promote each other synchronously. So accelerating the development of regional transport infrastructure construction and boosting local economies are good ways to reduce regional differences.