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Regional logistics has become an important direction of logistics development. The rationality of regional logistics network layout will affect the regional development. And the measurement and calculation of node gravity is an important aspect affecting the layout of logistics network. Nowadays, the traditional gravity model cannot measure the condition of a network properly. This paper focuses on the nodal gravity measurement in the logistics network and constructs an improved gravity model considering the role of policy. Quantifying the policy factors makes the measurement more realistic. We test our model on a famous regional logistics network in China. Result shows that cities are greatly influenced by policies, which change the node gravity obviously and even change the gravity level of logistics. This paper shows that the traditional gravity model ignores the impact of policy quantification on logistics gravity, and the improved gravity model that proposed in this paper has more practical significance.

Improved gravity model under policy control in regional logistics