Evaluating urban service economy gravitation and gravitational energy—Based on gravity model

This paper is devoted to introducing the notion of urban service economy gravitation and formulating service economy gravity model. Under specific traffic conditions, the developed model based on the conventional urban gravity model takes economic distance as the foundation, and the calculation of the model parameters are also discussed. With this backdrop, the model is applied to study Yangtze River Delta Megalopolis, which reveals the services economy gravitation and the gravitational energy between Shanghai and each other 15 cities.