Design and Develop City Space Database Based on the Network CASE Tool

Geodatabase data model is the spatial database model of the topological structure, which can accurately describe the underground pipeline space information in city. How to use Case tool and UML to expand Geodatabase model to establish a meet the demand of underground space database of kunming drainage pipeline,through analyzing the characteristics of the structure of kunming underground pipe. It is practiced that using Case tools and UML to extend the data model, not only to graphically design the database model with the graphic, but also clearly express the relationship between the various elements, which is an ideal method that establishing the city pipeline spatial databases.