关键词: GIS, 成渝地区双城经济圈, 交通可达性, 加权最短平均旅行时间, 城市空间

Abstract: Based on the methods of GIS spatial analysis and network analysis， this paper makes a quantitative study on the accessibility of highway， railway and comprehensive transportation network in ChengduChongqing economic circle， and uses the gravity model and potential model to measure and compare the spatial function intensity and potential value of cities in the region. The results show that it has formed a spatial distribution pattern of average shortest travel time with Chengdu and Chongqing as the core advantage area and the main axis of Chengdu and Chongqing gradually rising to the north and south poles， with obvious gradient characteristics. The calculation results of gravity model show that the region as a whole forms a radiation driving center centered on Chengdu and Chongqing， and the radiation driving effect on other cities in the region is greatly different due to the influence of regional location， traffic distance and road accessibility. The distribution trend of potential value is roughly centered on the core cities， and gradually decreases around.

Key words: GIS, ChengduChongqing economic circle, traffic accessibility, weighted shortest average travel time, urban space