Study on Topological Relationship Construction and Automated 3D Modeling of Rainwater Pipe Network

Abstract

Underground pipe network is an important infrastructure of the city. At present, there are problems in the three-dimensional pipeline modeling, such as chaotic pipeline topological relationship and imprecise pipeline model. For example, rainwater pipes are all at the same horizontal position, and do not have slopes like real pipelines. Therefore, this paper focuses on the construction of point-line topological relationship of rainwater pipe network, and the rapid realization of the automatic construction of three-dimensional rainwater pipe model with slope. This study uses the two-dimensional pipeline data shapefile as the data source, and names the pipe segment and pipe point with unique values as the primary key; and creates a method to quickly add the starting point name and the end point name of the pipe segment in the pipeline attribute table as the pipeline table, so as to achieve the purpose of quickly establishing topological relationship for a large amount of pipeline data. Then, based on the Feature Manipulate Engine (FME) platform, the two-dimensional pipe network data with completed pipe network topological relationship construction is parametrically modeled according to the attributes of the pipe network. Taking the Shangqiu ancient city data as an example, the construction of 614 pipelines and 621 pipe well models was completed within 5.3s, and the pipelines all have real slopes. This shows that the method proposed in this paper effectively improves the accuracy of the model and is superior in efficiency, and can play an important role in smart city management.