Multi-Scale Semantic Expression Model of Urban Underground Total Elements and Its Application

As a necessary way of intensive urban construction and an effective solution to the "urban disease problem", the development and utilization of urban underground space have received more and more attention. Aiming at the problem of incomprehensive integrated elements in the existing urban underground space research, leading to inconsistent development planning, a multi-scale semantic expression model for urban underground total elements information is proposed. Through the analysis of the characteristics, storage forms and semantic relations of the urban underground all-element information, the various entities contained in the all-element information and their attributes, and the connections between entities are clarified, and an ER diagram of the urban underground all-element information was constructed. A multi-scale semantic expression model of urban underground total elements information was proposed, including semantic layer, model layer, and expression layer, and show the application examples of this model in the three-dimensional evaluation of the suitability of urban underground space development.